不同变位模式下刚性挡土墙的动主动土压力

Dynamic Active Earth Pressure on Retaining Wall under Various Modes of Movement

基于Mononobe-Okabe理论的基本假设,通过对滑动土体中水平薄层单元的分析,建立了墙体平动(T)模式、墙体绕基础转动(RB)模式和墙体绕墙顶转动(RT)模式下的主动土压力的一阶微分方程式,给出了土压力强度、土压力合力、土压力作用点的理论计算公式,并将该理论计算公式与Mononobe-Okabe理论结果进行了比较.结果表明:土压力强度分布呈非线性分布,合力作用点到墙底的距离依(RB)模式、(T)模式和(RT)模式次序增大.当地面荷载q0=0时,各种墙体变位模式下的动土压力合力与Mononobe-Okabe理论相同.

On the basis of the Assumption of Mononobe-Okabe theory,the first-order differential equation for active earth pressure on the retaining wall was set up for the translation（T） mode,movement modes of rotation around base（RB） and rotation around top（RT） by analyzing slice elements extracted from the sliding soil wedge.And the formulas for calculating the unit earth pressure,the resultant earth pressure and the action point of the result pressure were given.The comparison between calculated results with the present formulas and Mononobe-Okabe theory has shown that the unit earth pressure is nonlinearly distributed;and that the distance from the action point of resultant pressure to the base of wall increases with the order of（RB）mode,（T） mode,and（RT） mode.It has also indicated that the calculated results of the resultant pressure under various modes of movement are in accordance with those of Mononobe-Okabe theory for q0=0.