CPT and CPTu static soundings are commonly used throughout the world and are applied to identify the subsoil under the construction objects. The test allows for direct exploitation of research results in designing of the direct or deep foundation. The apparatus is used to determine the parameters of cohesive and non-cohesive soils, inter alia, the liquidity index, density index, shear strength without drainage and oedometer modulus of the soil.
The use of electric cone with sensor of the pore water pressure CPTu test creates an additional opportunities. This version of the measuring cone allows for the continuous measurement of the parameters in the studied geological profile.
Execution of the test in such conditions may damage the measuring cone, therefore in such case the dynamic sounding DPH or DPSH is recommended to be used. The aim of research using static cone penetration CPT is to determine the resistance of soft rock during the insertion of the cone and friction on the sleeve.
The test involves forcing of the conical penetrometer vertically into the ground using the column of rods. The apparatus registers the resistance of the cone insertion qc, as well as the friction on the sleeve fs. Sounding in the CPTu technology additionally enables the measurement of the pore water pressure.
They are executed to identify sequence and depth of occurrence of the geological layers,. Based on the obtained results, the foundation of the structure can be designed optimally. Field investigation. Seismic cone penetration test SCPTu. Field vane test. The flat dilatometer test DMT.
