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CPT

Cone Penetration Testing


Perform CPT Logs to Obtain Geotechnical Data Commonly Needed for Construction Purposes

A Cone Penetration Test (CPT) is commonly used to determine the subsurface stratigraphy in situ (in place) and to estimate geotechnical parameters of the materials present. Geotechnical engineers typically use it to determine the necessary construction requirements for infrastructure – roadbeds, bridges, buildings. Due to the sensitive electronics inside the cone, it must be pushed to depth by static push methods. The test method consists of pushing an instrumented cone into the ground at a controlled 2 cm/sec push rate. Common measurements being collected are cone tip pressure, sleeve friction, pore pressure and tilt angle. Additional sensors can be added like seismic, or other geo-environmental logging tools.

CPT NOVA Cone

CPT Overview



Having offered CPT equipment for decades, Geoprobe® has come to understand how innovative and ahead of their time the first generation of CPT Cones were. These independently gauged compression cones deliver high resolution digital data. The Classic line even introduced wireless transmission via sound waves. This was a very common method for years, offered as an alternative to cones requiring a cable through the push rods.

Today we offer the next generation of CPT technology - NOVA. The NOVA CPT cone introduces higher resolution, more robust construction and improved accuracy. NOVA CPT delivers improved durability and sensitivity in an instrumented cone.

The Geotech AB NOVA CPT system has always been unique in the geotechnical industry and is known for its cordless data transmission system: a constant digital stream of data is sent to the surface through the sounding rods. No cable through the rods is needed in the cordless setup.

For more than 20 years, Geoprobe Systems® has teamed up with Geotech AB of Sweden to be the exclusive US distributor for Geotech AB Cone Penetration Testing tools for geotechnical and environmental studies. We also provide the service and support, offering repair and calibration services.

The cordless or corded NOVA CPT cones can be used from a variety of push platforms to provide continuous data, repeatable penetration results, and cost savings over traditional boring and sampling methods. NOVA Cones adhere to the national standards for construction (ASTM D-5778 Standard Test Method for Performing Electronic Friction Cone and Piezocone Penetration Testing of Soils. , as well as ISO 22476-1-11:2004).

Advantages of CPT

Advancing CPT with an anchored 6712 providing equal downforce of a 20 ton press

Figure 1: Advancing CPT with an anchored 6712 providing equal downforce of a 20 ton press

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Principles of Operation

CPT primary measurements include tip resistance(qc), sleeve friction(fs), and pore pressure(u).  Tip resistance is a measurement of soil hardness, sleeve friction is an indication of the soil cohesive strength commonly seen with clays and pore pressure is related to the pressure generated as the cone is advanced as well as an indication to the amount of clay in the formation.

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The cordless CPT does not require a cable for data transmission to the surface. Inside the cone, the digital coded signal is converted to an acoustic signal which is transmitted along the steel of the drill rods to the surface. Sound signals are received by a microphone at the surface which transmits the signal to a PC via a computer interface (Fig. 2).

A corded CPT system does not require the microphone as the data will travel through the cable to the surface computer interface and laptop computer.  A simple and cost effective 4-wire cord is used in this case, connecting through a cable adapter to the CPT Cone.

Operation of an Acoustic CPT System

Figure 2: Operation of an Acoustic CPT System

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Example Logs
CPT log showing Soil Classification, Tip (qc), Sleeve (fs), Pore Pressure (u2), and Friction Ratio (RF). Log easily shows the varying soil conditions encountered when pushing CPT in Saline County, KS. Log created using CPT-Pro (post-processing software).

Figure 3: CPT log showing Soil Classification, Tip (qc), Sleeve (fs), Pore Pressure (u2), and Friction Ratio (RF). Log easily shows the varying soil conditions encountered when pushing CPT in Saline County, KS. Log created using CPT-Pro (post-processing software).

CPT log showing Soil Classification, Tip (qc), Sleeve (fs), Pore Pressure (u2), and Friction Ratio (Rf). Log clearly shows the change from clay to sand in both tip pressure and pore pressure. Note the steady increase in pore pressure beginning at 36ft., indicating the probe encountered the water table. Log created using CPT-Pro (post-processing software).

Figure 4: CPT log showing Soil Classification, Tip (qc), Sleeve (fs), Pore Pressure (u2), and Friction Ratio (Rf). Log clearly shows the change from clay to sand in both tip pressure and pore pressure. Note the steady increase in pore pressure beginning at 36ft., indicating the probe encountered the water table. Log created using CPT-Pro (post-processing software).

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CPT-Pro Sample Log

Data interpretation software, called CPT-PRO, completes your CPT investigation.

CPT-PRO Data Interpretation Software:  Sample Log

Figure 5: CPT-PRO Data Interpretation Software: Sample Log

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Tooling & Instrumentation


Nova CPT

Features of NOVA CPT

Acoustic NOVA and Cable NOVA Systems

Figure 6: Acoustic NOVA and Cable NOVA Systems

There's lots more to be said about this innovative CPT equipment. To request more detailed information about how this CPT system can work for you request info from us or visit Geotech AB's website.

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Basic components of the RW NOVA CPT System (clockwise from the left): Instrumentation Cords, Depth Encoder, Computer Interface, RW NOVA Receiver, and RW NOVA Transmitter assembled to the NOVA CPT Probe.

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Seismic CPT Equipment

Seismic Cone Penetration Testing (SCPT) sounding provides a rapid and cost-effective method for directly measuring shear wave velocity of soils in situ. Shear wave velocity is used as an index of liquefaction resistance since both are influenced by many of the same factors. Alternatives to using SCPT for these geotechnical analysis can require laboratory testing or less reliable, highly empirical assessments.

SCPT shear wave velocity measurements are used in these evaluations:

The seismic CPT equipment is used as an add-on to our traditional CPT system. CPT data is taken in the same push that seismic information is generated.

The SCPT probe consists of a seismic adapter threaded to a standard CPT probe. The CPT probe records tip resistance, sleeve friction, pore pressure, and tilt angle while the seismic adapter is used to measure the shear wave velocities. The amount of data that is measured is too great for cordless transmission, so the SCPT probe is run with a data cable through the rods.

SCPT Benefits include:

How does a SCPT test work?

  1. Push the seismic CPT probe to the desired test depth (shear wave velocities will be measured at multiple depths in the same push.)
  2. Generate a seismic pulse by hitting the shear plate with a sledgehammer (the hammer hitting the plate creates a vibration that moves through the soil). Data aquisition begins as soon as the hammer hits the shear plate.
  3. The shear wave travels from the shear plate, through the soil, and excites the accelerometer on the seismic CPT probe as it moves past the probe's position.
  4. The accelerometer data is displayed and then stored on a laptop computer. Multiple seismic traces are generated at each depth.
  5. Push the probe to the next measurement depth. Data is filtered and wave velocities are calculated using the SCPT software - this can be done in the field or at the office.
SCPT Test Diagram

Figure 7: SCPT Test Diagram

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CPT Platforms

Some testing applications require that the tooling is pushed into the ground instead of hammered. To do this, the power of the machine's probe cylinder is used to advance the rod string instead of energy from the hammer. To achieve any sort of depth, a suitable reaction force must be used to balance the pushing capacity of the rig. This means that you either need a really heavy rig or you need to anchor your machine.

Static Push Platforms

2060CPT
Type: 20-ton Static Push Platform

The Geoprobe® 2060CPT is a 20 ton rated static push Cone Penetration Testing platform. The hydraulic push clamp and press advance the cone with up to 20 tons of downforce. When retracting the tool string, the 2060CPT has 30 tons of pullback. A hydraulic bottom clamp keeps rods from slipping back down hole when the push clamp is released during retrieval of the tool string. An optional 6712DT mast can be mounted on the porch end of the 2060CPT. This allows for coring, conventional soil sampling, shallow drilling for soil verification, and pre-drilling.
> Learn More

Geoprobe® 2060CPT

Anchoring Platforms

20CPT Press
Type: Press platform (designed for 6712DT or skid steer loaders)

The 20 CPT press from Geoprobe® is a flexible mast option designed specifically for performing cone penetration tests. Bracket options allow for mounting to various skid steer loaders or the Geoprobe® 6712DT. When anchored, the press has 20 tons of hydraulic downforce and 30 tons of pullback. The light weight system and small footprint allow this setup to be easily transported from location to location. This also enables the press to access sites where surface conditions will not support a larger, heavier machine.
> Learn More

Geoprobe® 20CPT Press

3230DT
Type: Geotechnical Combo Rig

The Geoprobe® 3230DT combo rig has the ability to efficiently sample the subsurface using both direct push and rotary drilling techniques and then quickly transition to pushing CPT tooling. Anchors are installed using the CB combo head and the CPT system is automatically pushed at a rate of 2 cm / second using the same head. With the 3230DT, drillers have multiple drilling methods at their fingertips.
> Learn More

Running CPT on the 3230DT Geotechnical Combo Rig

7822DT
Type: Geotechnical Combo Rig

The Geoprobe® 7822DT is designed to easily switch between multiple sampling and logging methods, including pushing CPT tooling.  Anchors are installed with the augerhead to provide the reaction force needed for the up to 9 tons of push typical for this platform. Using an optional head feed control kit, automatic rate control provides cone advancement at the standard 2 cm per second. Switching between drilling tasks and pushing CPT is quick on the 7822DT and only takes a few additional components.
> Learn More

Running CPT using a foot bridge anchored 7822dt

3100GT
Type: Geotechnical Drilling Rig

The 3100GT geotechnical drill rig can be setup for CPT by using a few simple anchoring components: a rod guide, anchor, and anchor bridge. Switching from geotechnical drilling to pushing CPT is a quick and simple process. Automatic head feed rate control advances the cone at a steady 2 centimeters per second specified by ASTM Standard D5778. This provides hands-free operation during advancement of each rod.
> Learn More

CPT on the 3100GT Geotechnical Drill Rig

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CPT + (MIHPT/OIHPT)
OIHPT sub with NOVA CPT lead

Figure 12: OIHPT sub with NOVA CPT lead

Operators of Geoprobe® Direct Image® Optical Image Profiler/Optical Image Hydraulic Profiling Tool (OIP/OIHPT) tooling can add CPT to their data stream in one of these push only tool combinations. Along with the CPT geotechnical data the operator will also collect soil conductivity with electric conductivity (EC), formation permeability measurements with HPT, and UV fluorescence of non-aqueous phase fuel hydrocarbons (NAPL) with the OIP. 

The OIHPT tool allows an operator to map NAPL fuels/oils by induced fluorescence from an onboard UV LED or Green laser diode with images being captured by an onboard CMOS camera. Mapping the vertical and horizontal extents of NAPL contamination along with soil EC and HPT injection pressure provides understanding of soil types, permeability and migration pathways.                     
> Learn More: OIP

The Membrane Interface Hydraulic Profiling Tool (MIHPT) allows an operator to map dissolved phase to NAPL levels of hydrocarbon or solvent based volatile organic compounds (VOCs). Operators around the world use MIP technology to hunt out contaminant source areas and/or delineated plume extents. The coupled EC and HPT sensors again allow for the collection of soil EC and HPT injection pressure to understand of soil types, permeability and migration pathways.
> Learn More: MIP

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Specifications


FAQ's


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CPT

Cone Penetration Testing


Perform CPT Logs to Obtain Geotechnical Data Commonly Needed for Construction Purposes

CPT

Cone Penetration Testing

20CPT Press mounted to the 6712DT

20CPT Press mounted to the 6712DT

NOVA CPT Cone

NOVA CPT Cone

20CPT Press mounted to a skid steer loader

20CPT Press mounted to a skid steer loader

2060CPT - 20-ton Static Push Platform

2060CPT - 20-ton Static Push Platform

Cone Penetration Testing with a Bridged and Anchored 7822

Cone Penetration Testing with a Bridged and Anchored 7822

CPT Advancement Inside Crawler

CPT Advancement Inside Crawler

Cone Advancement Under the Crawler

Cone Advancement Under the Crawler

Advancing CPT on the 3100GT (using earth anchors)

Advancing CPT on the 3100GT (using earth anchors)

Advancing CPT on the 3230DT (using earth anchors)

Advancing CPT on the 3230DT (using earth anchors)

20CPT Press mounted to the 6712DT
NOVA CPT Cone
20CPT Press mounted to a skid steer loader
2060CPT - 20-ton Static Push Platform
Cone Penetration Testing with a Bridged and Anchored 7822
CPT Advancement Inside Crawler
Cone Advancement Under the Crawler
Advancing CPT on the 3100GT (using earth anchors)
Advancing CPT on the 3230DT (using earth anchors)

Perform CPT Logs to Obtain Geotechnical Data Commonly Needed for Construction Purposes

A Cone Penetration Test (CPT) is commonly used to determine the subsurface stratigraphy in situ (in place) and to estimate geotechnical parameters of the materials present. Geotechnical engineers typically use it to determine the necessary construction requirements for infrastructure – roadbeds, bridges, buildings. Due to the sensitive electronics inside the cone, it must be pushed to depth by static push methods. The test method consists of pushing an instrumented cone into the ground at a controlled 2 cm/sec push rate. Common measurements being collected are cone tip pressure, sleeve friction, pore pressure and tilt angle. Additional sensors can be added like seismic, or other geo-environmental logging tools.

❯ Contact Us

A Cone Penetration Test (CPT) is commonly used to determine the subsurface stratigraphy in situ (in place) and to estimate geotechnical parameters of the materials present. Geotechnical engineers typically use it to determine the necessary construction requirements for infrastructure – roadbeds, bridges, buildings. Due to the sensitive electronics inside the cone, it must be pushed to depth by static push methods. The test method consists of pushing an instrumented cone into the ground at a controlled 2 cm/sec push rate. Common measurements being collected are cone tip pressure, sleeve friction, pore pressure and tilt angle. Additional sensors can be added like seismic, or other geo-environmental logging tools.

❯ Contact Us

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CPT Overview

Click on a section below to learn more about CPT.

CPT NOVA Cone

Having offered CPT equipment for decades, Geoprobe® has come to understand how innovative and ahead of their time the first generation of CPT Cones were. These independently gauged compression cones deliver high resolution digital data. The Classic line even introduced wireless transmission via sound waves. This was a very common method for years, offered as an alternative to cones requiring a cable through the push rods.

Today we offer the next generation of CPT technology - NOVA. The NOVA CPT cone introduces higher resolution, more robust construction and improved accuracy. NOVA CPT delivers improved durability and sensitivity in an instrumented cone.

The Geotech AB NOVA CPT system has always been unique in the geotechnical industry and is known for its cordless data transmission system: a constant digital stream of data is sent to the surface through the sounding rods. No cable through the rods is needed in the cordless setup.

  • Cable CPT has always been an option, but now in Cable NOVA we can offer an entry-level cost-effective approach. 
  • Acoustic NOVA is also offered in the same form as the first-generation Classic system.  In fact, some of the same parts are still used in this mode of operation.

For more than 20 years, Geoprobe Systems® has teamed up with Geotech AB of Sweden to be the exclusive US distributor for Geotech AB Cone Penetration Testing tools for geotechnical and environmental studies. We also provide the service and support, offering repair and calibration services.

The cordless or corded NOVA CPT cones can be used from a variety of push platforms to provide continuous data, repeatable penetration results, and cost savings over traditional boring and sampling methods. NOVA Cones adhere to the national standards for construction (ASTM D-5778 Standard Test Method for Performing Electronic Friction Cone and Piezocone Penetration Testing of Soils. , as well as ISO 22476-1-11:2004).

Advantages of CPT

  • There are many reasons for the widespread use of the CPT method. Probably the most important is the in-situ measurement... it measures soil properties in the right environment; in the soil as it is, where it is. 
  • The real-time, on-site interpretation of logs can be used to better dial in the soil type, water table and soil parameters for engineering design – ultimately saving project cost.
  • Additionally, faster production rates when compared to conventional drilling and sampling result in a more cost-effective operation.
Advancing CPT with an anchored 6712 providing equal downforce of a 20 ton press

Figure 1: Advancing CPT with an anchored 6712 providing equal downforce of a 20 ton press

CPT primary measurements include tip resistance(qc), sleeve friction(fs), and pore pressure(u).  Tip resistance is a measurement of soil hardness, sleeve friction is an indication of the soil cohesive strength commonly seen with clays and pore pressure is related to the pressure generated as the cone is advanced as well as an indication to the amount of clay in the formation.

The cordless CPT does not require a cable for data transmission to the surface. Inside the cone, the digital coded signal is converted to an acoustic signal which is transmitted along the steel of the drill rods to the surface. Sound signals are received by a microphone at the surface which transmits the signal to a PC via a computer interface (Fig. 2).

A corded CPT system does not require the microphone as the data will travel through the cable to the surface computer interface and laptop computer.  A simple and cost effective 4-wire cord is used in this case, connecting through a cable adapter to the CPT Cone.

Operation of an Acoustic CPT System

Figure 2: Operation of an Acoustic CPT System

CPT log showing Soil Classification, Tip (qc), Sleeve (fs), Pore Pressure (u2), and Friction Ratio (RF). Log easily shows the varying soil conditions encountered when pushing CPT in Saline County, KS. Log created using CPT-Pro (post-processing software).

Figure 3: CPT log showing Soil Classification, Tip (qc), Sleeve (fs), Pore Pressure (u2), and Friction Ratio (RF). Log easily shows the varying soil conditions encountered when pushing CPT in Saline County, KS. Log created using CPT-Pro (post-processing software).

CPT log showing Soil Classification, Tip (qc), Sleeve (fs), Pore Pressure (u2), and Friction Ratio (Rf). Log clearly shows the change from clay to sand in both tip pressure and pore pressure. Note the steady increase in pore pressure beginning at 36ft., indicating the probe encountered the water table. Log created using CPT-Pro (post-processing software).

Figure 4: CPT log showing Soil Classification, Tip (qc), Sleeve (fs), Pore Pressure (u2), and Friction Ratio (Rf). Log clearly shows the change from clay to sand in both tip pressure and pore pressure. Note the steady increase in pore pressure beginning at 36ft., indicating the probe encountered the water table. Log created using CPT-Pro (post-processing software).

Data interpretation software, called CPT-PRO, completes your CPT investigation.

  • Present CPT results
  • Identify soil types using the most common CPT soil behavior classifications
  • Calculate and present Geotechnical parameters
  • Standard penetration test (SPT) blow count correlation
  • Undrained shear strength
  • Relative density
  • Friction angle
  • Coefficient of lateral stress
  • Constrained Module
CPT-PRO Data Interpretation Software:  Sample Log

Figure 5: CPT-PRO Data Interpretation Software: Sample Log

CPT Probe

CPT Overview


CPT NOVA Cone

Having offered CPT equipment for decades, Geoprobe® has come to understand how innovative and ahead of their time the first generation of CPT Cones were. These independently gauged compression cones deliver high resolution digital data. The Classic line even introduced wireless transmission via sound waves. This was a very common method for years, offered as an alternative to cones requiring a cable through the push rods.

Today we offer the next generation of CPT technology - NOVA. The NOVA CPT cone introduces higher resolution, more robust construction and improved accuracy. NOVA CPT delivers improved durability and sensitivity in an instrumented cone.

The Geotech AB NOVA CPT system has always been unique in the geotechnical industry and is known for its cordless data transmission system: a constant digital stream of data is sent to the surface through the sounding rods. No cable through the rods is needed in the cordless setup.

  • Cable CPT has always been an option, but now in Cable NOVA we can offer an entry-level cost-effective approach. 
  • Acoustic NOVA is also offered in the same form as the first-generation Classic system.  In fact, some of the same parts are still used in this mode of operation.

For more than 20 years, Geoprobe Systems® has teamed up with Geotech AB of Sweden to be the exclusive US distributor for Geotech AB Cone Penetration Testing tools for geotechnical and environmental studies. We also provide the service and support, offering repair and calibration services.

The cordless or corded NOVA CPT cones can be used from a variety of push platforms to provide continuous data, repeatable penetration results, and cost savings over traditional boring and sampling methods. NOVA Cones adhere to the national standards for construction (ASTM D-5778 Standard Test Method for Performing Electronic Friction Cone and Piezocone Penetration Testing of Soils. , as well as ISO 22476-1-11:2004).

Advantages of CPT

  • There are many reasons for the widespread use of the CPT method. Probably the most important is the in-situ measurement... it measures soil properties in the right environment; in the soil as it is, where it is. 
  • The real-time, on-site interpretation of logs can be used to better dial in the soil type, water table and soil parameters for engineering design – ultimately saving project cost.
  • Additionally, faster production rates when compared to conventional drilling and sampling result in a more cost-effective operation.
Advancing CPT with an anchored 6712 providing equal downforce of a 20 ton press

Figure 1: Advancing CPT with an anchored 6712 providing equal downforce of a 20 ton press

Principles of Operation


CPT primary measurements include tip resistance(qc), sleeve friction(fs), and pore pressure(u).  Tip resistance is a measurement of soil hardness, sleeve friction is an indication of the soil cohesive strength commonly seen with clays and pore pressure is related to the pressure generated as the cone is advanced as well as an indication to the amount of clay in the formation.

The cordless CPT does not require a cable for data transmission to the surface. Inside the cone, the digital coded signal is converted to an acoustic signal which is transmitted along the steel of the drill rods to the surface. Sound signals are received by a microphone at the surface which transmits the signal to a PC via a computer interface (Fig. 2).

A corded CPT system does not require the microphone as the data will travel through the cable to the surface computer interface and laptop computer.  A simple and cost effective 4-wire cord is used in this case, connecting through a cable adapter to the CPT Cone.

Operation of an Acoustic CPT System

Figure 2: Operation of an Acoustic CPT System

Example Logs


CPT log showing Soil Classification, Tip (qc), Sleeve (fs), Pore Pressure (u2), and Friction Ratio (RF). Log easily shows the varying soil conditions encountered when pushing CPT in Saline County, KS. Log created using CPT-Pro (post-processing software).

Figure 3: CPT log showing Soil Classification, Tip (qc), Sleeve (fs), Pore Pressure (u2), and Friction Ratio (RF). Log easily shows the varying soil conditions encountered when pushing CPT in Saline County, KS. Log created using CPT-Pro (post-processing software).

CPT log showing Soil Classification, Tip (qc), Sleeve (fs), Pore Pressure (u2), and Friction Ratio (Rf). Log clearly shows the change from clay to sand in both tip pressure and pore pressure. Note the steady increase in pore pressure beginning at 36ft., indicating the probe encountered the water table. Log created using CPT-Pro (post-processing software).

Figure 4: CPT log showing Soil Classification, Tip (qc), Sleeve (fs), Pore Pressure (u2), and Friction Ratio (Rf). Log clearly shows the change from clay to sand in both tip pressure and pore pressure. Note the steady increase in pore pressure beginning at 36ft., indicating the probe encountered the water table. Log created using CPT-Pro (post-processing software).

CPT-Pro Sample Log


Data interpretation software, called CPT-PRO, completes your CPT investigation.

  • Present CPT results
  • Identify soil types using the most common CPT soil behavior classifications
  • Calculate and present Geotechnical parameters
  • Standard penetration test (SPT) blow count correlation
  • Undrained shear strength
  • Relative density
  • Friction angle
  • Coefficient of lateral stress
  • Constrained Module
CPT-PRO Data Interpretation Software:  Sample Log

Figure 5: CPT-PRO Data Interpretation Software: Sample Log




Tooling & Instrumentation

Click on a section below to learn more about the tooling for CPT.

Features of NOVA CPT

  • Wireless NOVA cone and data transmission technology makes logging quicker and easier!
  • The only CPT probe industry-wide that provides a constant stream of real-time data while you're probing... without a cord downhole. Information collected includes soil resistance on the cone tip, resistance on the outer sides, and pore pressures generated during the test.
  • The only wireless data transmission system of its kind
  • The operator does not have to manage data cable as the rods are cycled in and out of the sounding hole. Rod handling is efficient and the risk of cable damage is eliminated.
  • Data transmission methods: Acoustic NOVA, Cable NOVA.
  • Cost effective option to run cable NOVA.
  • New cone design offers 18 bit resolution with improved strength and gauge measurement accuracy.
  • Repeatable penetration results
  • Since the rod bore is free and clear, it can be used for lubrication grouting as the rods are pushed into the ground and for retraction grouting (hole sealing) as the rods are pulled. (only available by Acoustic NOVA)
  • Can be used with multiple push platforms: drill rigs, cone trucks, Geoprobe® direct push machines....
  • Interpret results quickly with user-friendly CPT-PRO software for comprehensive data evaluation.  Or by the free DI Viewer.
Acoustic NOVA and Cable NOVA Systems

Figure 6: Acoustic NOVA and Cable NOVA Systems

There's lots more to be said about this innovative CPT equipment. To request more detailed information about how this CPT system can work for you request info from us or visit Geotech AB's website.

Basic components of the RW NOVA CPT System (clockwise from the left): Instrumentation Cords, Depth Encoder, Computer Interface, RW NOVA Receiver, and RW NOVA Transmitter assembled to the NOVA CPT Probe.

Seismic Cone Penetration Testing (SCPT) sounding provides a rapid and cost-effective method for directly measuring shear wave velocity of soils in situ. Shear wave velocity is used as an index of liquefaction resistance since both are influenced by many of the same factors. Alternatives to using SCPT for these geotechnical analysis can require laboratory testing or less reliable, highly empirical assessments.

SCPT shear wave velocity measurements are used in these evaluations:

  • Liquefaction risk
  • Earthquake generated ground-surface movements
  • Foundations for vibrating equipment
  • Behavior of offshore structures due to wave loading

The seismic CPT equipment is used as an add-on to our traditional CPT system. CPT data is taken in the same push that seismic information is generated.

The SCPT probe consists of a seismic adapter threaded to a standard CPT probe. The CPT probe records tip resistance, sleeve friction, pore pressure, and tilt angle while the seismic adapter is used to measure the shear wave velocities. The amount of data that is measured is too great for cordless transmission, so the SCPT probe is run with a data cable through the rods.

SCPT Benefits include:

  • Rapid, cost-effective method for measuring shear wave velocities
  • CPT coupled with Seismic CPT gives details on soil types, engineering parameters, and shear wave velocity in the same test hole
  • Patented Cross Correlation process for interval velocity calculations
  • Cross Correlation removes human bias and gives realistic error estimates
  • Seismic cone adapter is equipped with an accelerometer so that we achieve the best definition of the frequency spectrum and avoid data smearing
  • Available in uniaxial configuration for measuring shear wave velocity and in triaxial configuration for measuring shear and compression wave velocity

How does a SCPT test work?

  1. Push the seismic CPT probe to the desired test depth (shear wave velocities will be measured at multiple depths in the same push.)
  2. Generate a seismic pulse by hitting the shear plate with a sledgehammer (the hammer hitting the plate creates a vibration that moves through the soil). Data aquisition begins as soon as the hammer hits the shear plate.
  3. The shear wave travels from the shear plate, through the soil, and excites the accelerometer on the seismic CPT probe as it moves past the probe's position.
  4. The accelerometer data is displayed and then stored on a laptop computer. Multiple seismic traces are generated at each depth.
  5. Push the probe to the next measurement depth. Data is filtered and wave velocities are calculated using the SCPT software - this can be done in the field or at the office.
SCPT Test Diagram

Figure 7: SCPT Test Diagram

Some testing applications require that the tooling is pushed into the ground instead of hammered. To do this, the power of the machine's probe cylinder is used to advance the rod string instead of energy from the hammer. To achieve any sort of depth, a suitable reaction force must be used to balance the pushing capacity of the rig. This means that you either need a really heavy rig or you need to anchor your machine.

Static Push Platforms

2060CPT
Type: 20-ton Static Push Platform

The Geoprobe® 2060CPT is a 20 ton rated static push Cone Penetration Testing platform. The hydraulic push clamp and press advance the cone with up to 20 tons of downforce. When retracting the tool string, the 2060CPT has 30 tons of pullback. A hydraulic bottom clamp keeps rods from slipping back down hole when the push clamp is released during retrieval of the tool string. An optional 6712DT mast can be mounted on the porch end of the 2060CPT. This allows for coring, conventional soil sampling, shallow drilling for soil verification, and pre-drilling.
> Learn More

Geoprobe® 2060CPT

Anchoring Platforms

20CPT Press
Type: Press platform (designed for 6712DT or skid steer loaders)

The 20 CPT press from Geoprobe® is a flexible mast option designed specifically for performing cone penetration tests. Bracket options allow for mounting to various skid steer loaders or the Geoprobe® 6712DT. When anchored, the press has 20 tons of hydraulic downforce and 30 tons of pullback. The light weight system and small footprint allow this setup to be easily transported from location to location. This also enables the press to access sites where surface conditions will not support a larger, heavier machine.
> Learn More

Geoprobe® 20CPT Press

3230DT
Type: Geotechnical Combo Rig

The Geoprobe® 3230DT combo rig has the ability to efficiently sample the subsurface using both direct push and rotary drilling techniques and then quickly transition to pushing CPT tooling. Anchors are installed using the CB combo head and the CPT system is automatically pushed at a rate of 2 cm / second using the same head. With the 3230DT, drillers have multiple drilling methods at their fingertips.
> Learn More

Running CPT on the 3230DT Geotechnical Combo Rig

7822DT
Type: Geotechnical Combo Rig

The Geoprobe® 7822DT is designed to easily switch between multiple sampling and logging methods, including pushing CPT tooling.  Anchors are installed with the augerhead to provide the reaction force needed for the up to 9 tons of push typical for this platform. Using an optional head feed control kit, automatic rate control provides cone advancement at the standard 2 cm per second. Switching between drilling tasks and pushing CPT is quick on the 7822DT and only takes a few additional components.
> Learn More

Running CPT using a foot bridge anchored 7822dt

3100GT
Type: Geotechnical Drilling Rig

The 3100GT geotechnical drill rig can be setup for CPT by using a few simple anchoring components: a rod guide, anchor, and anchor bridge. Switching from geotechnical drilling to pushing CPT is a quick and simple process. Automatic head feed rate control advances the cone at a steady 2 centimeters per second specified by ASTM Standard D5778. This provides hands-free operation during advancement of each rod.
> Learn More

CPT on the 3100GT Geotechnical Drill Rig

OIHPT sub with NOVA CPT lead

Figure 12: OIHPT sub with NOVA CPT lead

Operators of Geoprobe® Direct Image® Optical Image Profiler/Optical Image Hydraulic Profiling Tool (OIP/OIHPT) tooling can add CPT to their data stream in one of these push only tool combinations. Along with the CPT geotechnical data the operator will also collect soil conductivity with electric conductivity (EC), formation permeability measurements with HPT, and UV fluorescence of non-aqueous phase fuel hydrocarbons (NAPL) with the OIP. 

The OIHPT tool allows an operator to map NAPL fuels/oils by induced fluorescence from an onboard UV LED or Green laser diode with images being captured by an onboard CMOS camera. Mapping the vertical and horizontal extents of NAPL contamination along with soil EC and HPT injection pressure provides understanding of soil types, permeability and migration pathways.                     
> Learn More: OIP

The Membrane Interface Hydraulic Profiling Tool (MIHPT) allows an operator to map dissolved phase to NAPL levels of hydrocarbon or solvent based volatile organic compounds (VOCs). Operators around the world use MIP technology to hunt out contaminant source areas and/or delineated plume extents. The coupled EC and HPT sensors again allow for the collection of soil EC and HPT injection pressure to understand of soil types, permeability and migration pathways.
> Learn More: MIP

Tooling & Instrumentation


Nova CPT

Features of NOVA CPT

  • Wireless NOVA cone and data transmission technology makes logging quicker and easier!
  • The only CPT probe industry-wide that provides a constant stream of real-time data while you're probing... without a cord downhole. Information collected includes soil resistance on the cone tip, resistance on the outer sides, and pore pressures generated during the test.
  • The only wireless data transmission system of its kind
  • The operator does not have to manage data cable as the rods are cycled in and out of the sounding hole. Rod handling is efficient and the risk of cable damage is eliminated.
  • Data transmission methods: Acoustic NOVA, Cable NOVA.
  • Cost effective option to run cable NOVA.
  • New cone design offers 18 bit resolution with improved strength and gauge measurement accuracy.
  • Repeatable penetration results
  • Since the rod bore is free and clear, it can be used for lubrication grouting as the rods are pushed into the ground and for retraction grouting (hole sealing) as the rods are pulled. (only available by Acoustic NOVA)
  • Can be used with multiple push platforms: drill rigs, cone trucks, Geoprobe® direct push machines....
  • Interpret results quickly with user-friendly CPT-PRO software for comprehensive data evaluation.  Or by the free DI Viewer.
Acoustic NOVA and Cable NOVA Systems

Figure 6: Acoustic NOVA and Cable NOVA Systems

There's lots more to be said about this innovative CPT equipment. To request more detailed information about how this CPT system can work for you request info from us or visit Geotech AB's website.

Basic components of the RW NOVA CPT System (clockwise from the left): Instrumentation Cords, Depth Encoder, Computer Interface, RW NOVA Receiver, and RW NOVA Transmitter assembled to the NOVA CPT Probe.

Seismic CPT Equipment

Seismic Cone Penetration Testing (SCPT) sounding provides a rapid and cost-effective method for directly measuring shear wave velocity of soils in situ. Shear wave velocity is used as an index of liquefaction resistance since both are influenced by many of the same factors. Alternatives to using SCPT for these geotechnical analysis can require laboratory testing or less reliable, highly empirical assessments.

SCPT shear wave velocity measurements are used in these evaluations:

  • Liquefaction risk
  • Earthquake generated ground-surface movements
  • Foundations for vibrating equipment
  • Behavior of offshore structures due to wave loading

The seismic CPT equipment is used as an add-on to our traditional CPT system. CPT data is taken in the same push that seismic information is generated.

The SCPT probe consists of a seismic adapter threaded to a standard CPT probe. The CPT probe records tip resistance, sleeve friction, pore pressure, and tilt angle while the seismic adapter is used to measure the shear wave velocities. The amount of data that is measured is too great for cordless transmission, so the SCPT probe is run with a data cable through the rods.

SCPT Benefits include:

  • Rapid, cost-effective method for measuring shear wave velocities
  • CPT coupled with Seismic CPT gives details on soil types, engineering parameters, and shear wave velocity in the same test hole
  • Patented Cross Correlation process for interval velocity calculations
  • Cross Correlation removes human bias and gives realistic error estimates
  • Seismic cone adapter is equipped with an accelerometer so that we achieve the best definition of the frequency spectrum and avoid data smearing
  • Available in uniaxial configuration for measuring shear wave velocity and in triaxial configuration for measuring shear and compression wave velocity

How does a SCPT test work?

  1. Push the seismic CPT probe to the desired test depth (shear wave velocities will be measured at multiple depths in the same push.)
  2. Generate a seismic pulse by hitting the shear plate with a sledgehammer (the hammer hitting the plate creates a vibration that moves through the soil). Data aquisition begins as soon as the hammer hits the shear plate.
  3. The shear wave travels from the shear plate, through the soil, and excites the accelerometer on the seismic CPT probe as it moves past the probe's position.
  4. The accelerometer data is displayed and then stored on a laptop computer. Multiple seismic traces are generated at each depth.
  5. Push the probe to the next measurement depth. Data is filtered and wave velocities are calculated using the SCPT software - this can be done in the field or at the office.
SCPT Test Diagram

Figure 7: SCPT Test Diagram

CPT Platforms

Some testing applications require that the tooling is pushed into the ground instead of hammered. To do this, the power of the machine's probe cylinder is used to advance the rod string instead of energy from the hammer. To achieve any sort of depth, a suitable reaction force must be used to balance the pushing capacity of the rig. This means that you either need a really heavy rig or you need to anchor your machine.

Static Push Platforms

2060CPT
Type: 20-ton Static Push Platform

The Geoprobe® 2060CPT is a 20 ton rated static push Cone Penetration Testing platform. The hydraulic push clamp and press advance the cone with up to 20 tons of downforce. When retracting the tool string, the 2060CPT has 30 tons of pullback. A hydraulic bottom clamp keeps rods from slipping back down hole when the push clamp is released during retrieval of the tool string. An optional 6712DT mast can be mounted on the porch end of the 2060CPT. This allows for coring, conventional soil sampling, shallow drilling for soil verification, and pre-drilling.
> Learn More

Geoprobe® 2060CPT

Anchoring Platforms

20CPT Press
Type: Press platform (designed for 6712DT or skid steer loaders)

The 20 CPT press from Geoprobe® is a flexible mast option designed specifically for performing cone penetration tests. Bracket options allow for mounting to various skid steer loaders or the Geoprobe® 6712DT. When anchored, the press has 20 tons of hydraulic downforce and 30 tons of pullback. The light weight system and small footprint allow this setup to be easily transported from location to location. This also enables the press to access sites where surface conditions will not support a larger, heavier machine.
> Learn More

Geoprobe® 20CPT Press

3230DT
Type: Geotechnical Combo Rig

The Geoprobe® 3230DT combo rig has the ability to efficiently sample the subsurface using both direct push and rotary drilling techniques and then quickly transition to pushing CPT tooling. Anchors are installed using the CB combo head and the CPT system is automatically pushed at a rate of 2 cm / second using the same head. With the 3230DT, drillers have multiple drilling methods at their fingertips.
> Learn More

Running CPT on the 3230DT Geotechnical Combo Rig

7822DT
Type: Geotechnical Combo Rig

The Geoprobe® 7822DT is designed to easily switch between multiple sampling and logging methods, including pushing CPT tooling.  Anchors are installed with the augerhead to provide the reaction force needed for the up to 9 tons of push typical for this platform. Using an optional head feed control kit, automatic rate control provides cone advancement at the standard 2 cm per second. Switching between drilling tasks and pushing CPT is quick on the 7822DT and only takes a few additional components.
> Learn More

Running CPT using a foot bridge anchored 7822dt

3100GT
Type: Geotechnical Drilling Rig

The 3100GT geotechnical drill rig can be setup for CPT by using a few simple anchoring components: a rod guide, anchor, and anchor bridge. Switching from geotechnical drilling to pushing CPT is a quick and simple process. Automatic head feed rate control advances the cone at a steady 2 centimeters per second specified by ASTM Standard D5778. This provides hands-free operation during advancement of each rod.
> Learn More

CPT on the 3100GT Geotechnical Drill Rig

CPT + (MIHPT/OIHPT)

OIHPT sub with NOVA CPT lead

Figure 12: OIHPT sub with NOVA CPT lead

Operators of Geoprobe® Direct Image® Optical Image Profiler/Optical Image Hydraulic Profiling Tool (OIP/OIHPT) tooling can add CPT to their data stream in one of these push only tool combinations. Along with the CPT geotechnical data the operator will also collect soil conductivity with electric conductivity (EC), formation permeability measurements with HPT, and UV fluorescence of non-aqueous phase fuel hydrocarbons (NAPL) with the OIP. 

The OIHPT tool allows an operator to map NAPL fuels/oils by induced fluorescence from an onboard UV LED or Green laser diode with images being captured by an onboard CMOS camera. Mapping the vertical and horizontal extents of NAPL contamination along with soil EC and HPT injection pressure provides understanding of soil types, permeability and migration pathways.                     
> Learn More: OIP

The Membrane Interface Hydraulic Profiling Tool (MIHPT) allows an operator to map dissolved phase to NAPL levels of hydrocarbon or solvent based volatile organic compounds (VOCs). Operators around the world use MIP technology to hunt out contaminant source areas and/or delineated plume extents. The coupled EC and HPT sensors again allow for the collection of soil EC and HPT injection pressure to understand of soil types, permeability and migration pathways.
> Learn More: MIP

Videos



Resources

Click on a section below to view information.

20CPT Press mounted to the 6712DT

20CPT Press mounted to the 6712DT

NOVA CPT Cone

NOVA CPT Cone

20CPT Press mounted to a skid steer loader

20CPT Press mounted to a skid steer loader

2060CPT - 20-ton Static Push Platform

2060CPT - 20-ton Static Push Platform

Cone Penetration Testing with a Bridged and Anchored 7822

Cone Penetration Testing with a Bridged and Anchored 7822

CPT Advancement Inside Crawler

CPT Advancement Inside Crawler

Cone Advancement Under the Crawler

Cone Advancement Under the Crawler

Advancing CPT on the 3100GT (using earth anchors)

Advancing CPT on the 3100GT (using earth anchors)

Advancing CPT on the 3230DT (using earth anchors)

Advancing CPT on the 3230DT (using earth anchors)

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