The relieving platform limits the sliding plane,and the sliding mass at this time is no longer a voussoir,so,Rankine theory and Coulomb theory can t be applied to calculate the earth pressure.

• 减压平台限制了墙后滑动面,此时滑动土体不再是一个楔体,无法采用朗肯理论、库仑理论计算土压力。