Effectiveness of Electronic Cone Penetration Testing to Predict Undrained Shear Strength of Ariake Clay

Abstract

Evaluation of undrained shear strength (s_u) of clay by using laboratory tests usually faces serious problems due to limited data available and often large scatter caused by sample disturbance. In this paper, the value of electronic cone factor N_kt =11 was used to predict s_u of Ariake clay by electronic cone penetration testing. The filtering equation which is expressed as the function of the deformation modulus (E₅₀) and excess pore water pressure (u_d) was proposed as a simple equation to remove the s_u values those are considered to be rather disturbed. The filtered selected s_u values were compared to find fairly good agreement with the s_u predicted by the electronic cone penetration testing data. These errors were about ±20%.