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Cone Penetration Tests (CPT)

The cone penetration test (CPT) is based on pushing a penetration cone using a system of penetration rods with constant velocity of (20 - 25 mm/s) into the soil. During the penetration test the values of the cone resistance qc and the local skin friction fs, respectively are recorded. The cone resistance thus represents in general the resistance against penetration of a cone spike into the soil (subsoil). The diameter of the tip of cone spike is typically in the range of 25 - 50 mm.

The cone resistance qc [MPa] represents the ratio of the measured force on the cone tip Qc and the area of normal projection of the cone tip Ac.

The local skin friction fs [kPa] represents the ratio of the measured force on the friction of sleeve Fs and the area of its skin As.

The result of cone penetration test is its distribution plotted as a graph. The evaluation of cone penetration tests (CPT) serve as an input parameter for the analyses in the "Pile CPT" program.

Import of CPT

The results of cone penetration tests (CPT) can be imported into the program by inserting the file in different formats (eg. *.TXT, *.CPT, *.GI3, *.GEF).

Literature:

EN ISO 22476-1: Geotechnical investigation and testing - Field testing. Part 1: Electrical cone and piezocone penetration test, 2013.

EN ISO 22476-12: Geotechnical investigation and testing - Field testing. Part 12: Mechanical cone penetration test (CPTM), 2009.