ANALYSIS OF SEISMIC ACTIVE EARTH PRESSURE OF COHESIVE SOIL BEHIND RETAINING WALL

Based on the planar rupture surfaces hypothesis of Mononobe-Okabe theory,considering the effect of amplification of seismic accelerations and using the pseudo-dynamics method,the seismic active earth pressure coefficient,the resultant force of seismic active earth pressure and the distribution of active earth pressure on a rigid retaining wall supporting cohesive backfill are obtained respectively.Time and phase changes within the backfill are also considered.On this basis,the most unfavorable conditions are investigated by an optimization algorithm.Then the effects of horizontal and vertical seismic accelerations,internal fiction angle,wall friction angle,retaining wall angle and amplification on the inclination of the slip surface on active earth pressure coefficient,critical depth,the location of resultant force and the distribution of active earth pressure are discussed.The results show that the distribution of seismic active earth pressure is nonlinear.The existence of seismic acceleration induces a considerable increase in the active earth pressure of cohesive soil.The retaining wall angle and amplification effect of seismic accelerations have obvious influences on the critical depth,location of resultant force and distribution of passive earth pressure.