Research on dynamic active earth pressure of layered soil with different wall movement modes

In order to verify the effects of wall movement models on the active earth pressure of layered soil under seismic loading,a method for estimating the dynamic active earth pressure of layered soils is proposed based on the horizontal layer method considering the effect of wall movement model in this paper.The complicated derivation of earth pressure stress expression is simplified by introducing matrix equation,and the rapid calculation of dynamic active earth pressure in complex cases can be achieved by using a computer program compiled with Fortran language.The distributions of dynamic active earth pressure in different movement modes,the effects of equivalent cohesion and equivalent internal friction angle at the bottom and top surfaces of soil micro-section onthe distribution of dynamic active earth pressure in different movement modes,and the effect of earth pressure on the maximum moment at wall heel,are investigated in this paper.Results indicate that the distribution of dynamic active earth pressure stress in the rotation about top(RT)mode tends to converge inward,and the stress concentrates on the upper part of the wall;but in the rotation about bottom(RB)mode,the distribution of dynamic active earth pressure stress is divergent,and the stress concentrates on the lower part of the wall.And the equivalent internal friction angle has significant effects on the distribution of dynamic active earth stress.The rupture surface corresponding to the maximum moment at wall heel generated by dynamic earth pressure is not the rupture surface when active earth pressure generated.