Testing Details


What is Cone Penetration Testing?

Cone Penetration Testing (CPT) uses a cylindrical cone pushed vertically into the ground at a constant rate of penetration of 20mm per second.

During penetration, measurements are made of the cone resistance, the side friction against the cylindrical shaft, and in Piezocone Tests, the pore water pressure generated at penetration by the cone.

The measurements are made and recorded using strain gauges over load cells. The 16-bit resolution of the cone provides a very detailed and accurate picture of the variation of the measured parameters with penetration depth.

Cone penetration testing (CPT) is used to:

  • Determine types of soil
  • Identify materials present
  • Estimate geotechnical parameters
  • Provide results for direct geotechnical design

Our Methods

Methods of Testing

Tip & friction cones

(10MPa, 50MPa & 100MPa cones – all 10cm2 cones)

15cm2 cones

(100MPa) which can be used for stiff clays


Pore water & dissipation

Resistivity cone

Including Dual Geophone cones 1m or 1/2m apart


Further information can be found at http://www.marchetti-dmt.it

T-Bar and Ball Penetrometer testing

Near continuous undisturbed soil sampling capability

Testing details


At Probedrill, we use the latest equipment to carry out the most technologically advanced cone penetration testing (CPT). We are continually updating, expanding and improving our geotechnical services in all areas available for cone penetration testing.

We believe that with our extensive range of equipment, we will be able to get to most testing locations. However, if you believe that our range of equipment would not be suitable for your situation, please feel free to contact the office/workshop as modifications may be made to meet your testing requirements.



Probedrill can install instruments to help monitor developments over time. Examples of our instrumentation include :


Graphs / Plots

We can provide you with a large range of graphs for your measurement and review purposes. Graphs are provided in hard copy and also emailed in PDF format (examples below). We also provide you with the raw data files (.txt files) that can be uploaded into your specific software.

We can also provide Inclination readings on the plots, as well as coordinates obtained by the DGPS of locations.