On the in-situ soil property evaluation method by electronic cone penetration testing

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The Electronic Cone Penetration Testing (ECPT) is world-widely used as as in-situ ground investigation technique for determining accurate soil profiles and providing quantitative soil properties. The main purpose of ECPT is to obtain data on mechanical properties like undrained shear strength (S_u ) and excess pore water pressure of soft cohesive soils.The values of S_u, which are obtained from laboratory tests, usually include some disturbed values due to sample transportation, different procedure, various laboratory tests and the technique of determination of S_u. To obtain undisturbed strength data, filtering the samples from disturbed soil is needed. In this research, the filtering equation which is expressed as the function of the deformation modulus ( E_<50> ) and the excess pore water pressure ( u_d ) is proposed as a simple equation and applied for Ariake clay sites to remove the s_u values which are considered to be rather disturbed in which E_<50> and u_d are considered to depend on the disturbance of strength and structure of clay, respectively.The filtered selected s_u values were compared to find fairly good agreement with the s_u predicted by the ECPT data for Ariake clay sites.