刚性挡土墙绕墙顶转动时的被动土压力分布

为了能够用较简单的数值公式模拟挡土墙变位后的土压力分布，并能较好地反映试验实测结果，根据土体微分单元体的静力平衡条件，建立了挡土墙绕墙顶转动情况下被动土压力分布的计算表达式；同时进行了被动土压力合力、作用点与库仑土压力及实测结果的分析比较．公式很好地反映了实测曲线的非线性分布，同时被动土压力合力与库仑被动土压力基本相同，合力作用点接近于0.27倍墙高处．可以供设计参考使用。

Distribution of passive earth pressure with top rotation of rigid wall movement

Based on the condition of static equilibrium in sliding soil,the passive pressure with wall movement for cohesionless soil was derived in order to express simply the magnitudes of earth pressure for the wall and several movement modes and verify some experimental observations with formals. The theoretical answers to the unit earth pressures and the resultant earth pressures on retaining wall were obtained for wall movement mode of rotation about top. The comparisons were made with the formula for the wall movement mode of translation,the Colomb's formula and some experimental observations. It was shown that the magnitude of the earth pressure was distributed non linearly along the wall. The points of application of the resultant earth pressures were close to the 0.27 of rigid wall.