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Cone Penetration Testing
Cone penetration testing (CPT) is an in-situ test whereby a cone penetrometer mounted to a series of steel rods is pushed vertically into the ground. Hydraulic rams on our CPT rigs push the cone at a constant rate of 20 mm per second to depths of up to 100 m.
Lankelma frequently deploys a piezocone, as well as offering a number of specialist cones that can be run concurrently to test different geological environments and evaluate a range of soil parameters. The CPT platform can also be used for obtaining samples and undertaking geotechnical installations.
Why choose Cone Penetration Testing?
CPT is ideal for testing a range of soils. The cone penetrometer measures the in-situ stress conditions and shear strength which can be utilised in geotechnical design. CPT results are often used directly for piled foundation design in sands and gravels. The testing itself is quiet producing no vibrations, with minimal soil disturbance ideal for sensitive sites.
Testing is repeatable, high quality and results are available in real time. These instantaneous results allow for on-site selection of the best locations for testing, sampling and monitoring. The data is sent electronically to the office for processing where our preliminary results are issued to clients within 24 hrs of testing, with our final report for standard CPT testing issued within 7 days.
Lankelma has also published a text book, In-situ soil testing, by JJ M Brouwer. This useful overview of CPT provides information on testing, sampling and instrumentation for land, nearshore and offshore projects. More than 25 cone penetrometers, instrumentation devices and samplers are described. Click here to view the online version.