Dynamic Cone Penetration Test

Definition - What does Dynamic Cone Penetration Test mean?

The dynamic cone penetration test is a method of geotechnical investigation that gives a measure of the in-situ resistance of soil to penetration. This method can help determine the strength of in-situ soil and depth and thickness of sub-surface soil layers. The test is simple, cost effective and easy to transport. This test along with other tests is conducted prior to carrying out trenchless installation projects.

The geotechnical investigation reports carry all information required to make decisions regarding the method and tools most suitable for a project.

Trenchlesspedia explains Dynamic Cone Penetration Test

The dynamic cone penetration test is performed by driving a cone into the ground by repeated blows with a standard weight dropped from a standard height. The penetration of the cone is measured after every blow and recorded. For harder soil, the reading may be noted after a certain number of hammer blows. The standard cone size is 20 mm diameter and angle of 60°, with the hammer having a weight of 8 kg.

This test can measure resilient modulus, California bearing ration (CBR), shear strength, and unconfined compressive strength.

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