Pore water pressure-residual strain model of soft clay under traffic loading

According to characters of traffic loading,cyclic triaxial tests were designed to study the dynamic behavior of saturated soft clay under traffic loading.Results show that there is critical cyclic stress ratio of soft clay under cyclic loading.The value of critical cyclic stress ratio obtained by pore water pressure curves is lower than that obtained by dynamic strain curves.The stress-strain curves is approximately symmetrical around origin when there is no initial shear stress.At a higher initial shear stress,the stress-strain curves are nearly parallel to each other with the progressive number of cycles.With the increase of initial shear stress,peak pore water pressure and cyclic pore water pressure amplitude decrease.The axial strain increases significantly,and the cyclic strain amplitude decreases as the increase of initial shear stress.When the cyclic stress ratio is lower than the critical cyclic stress ratio,the pore water pressure ratio and dynamic strain data are concentrated on one curve for the same initial shear stress.The residual pore water pressure-accumulative plastic strain model of soft clay under traffic loading is obtained by regression.