CPT / CPTU or sondir is testing the soil by pressing the conus into the ground. From this test, the resistance value of conus penetration and sticky resistance is obtained, as well as the measurement of pore pressure on the CPTU. Conus penetration resistance is the resistance of the ground to the conus end which is expressed in force per unit area. Adherent resistance is the ground shear resistance to the biconus sheath in force per unit length. This test aims to determine the carrying capacity of the soil as the basis for the design of the foundation in order to have a high safety factor.


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