考虑土拱效应挡土墙绕墙底转动的主动土压力

采用库仑土压力理论的假设，通过研究刚性挡墙绕墙底转动极限状态土体内主应力拱形状，计算了土层平均竖向应力和剪应力，得到了对应于不同内摩擦角和墙土摩擦角的侧土压力系数和水平摩擦系数的理论公式。将其用于水平微分单元法求解挡墙绕墙底转动时的主动土压力，得到了挡土墙主动土压力强度、土压力合力和合力作用点的理论公式，分析了填土内摩擦角和墙土摩擦角对土侧压力系数、水平摩擦系数、土压力强度、土压力合力、土压力合力作用点的影响，并与模型试验数据进行了比较。

Active Earth Pressure with Wall Rotation Movement about Base Considering Soil Arching

Based on coulomb＇s theory and the study on the shape of the principal stress arching in limiting state soil behind the rigid retaining wall with the rotation about base, the horizontally earth pressure factor and the horizontal friction coefficients were calculated for different friction angle of soil and friction angle between wall-surface and soil to study the vertical stress and shear stress. And the theoretical formulas were obtained for the active earth pressures, the resultant earth pressures and the points of application of resultant earth pressures. The effects of the internal frictional angle of backfill and the frictional angle between the wall back and the backfill on several parameters were investigated, which included the lateral coefficient of earth pressure, the horizontal friction coefficients, the unit earth pressure, the resultant force of earth pressure, the application point of the resultant force and the overturning stability of a retaining wall. And the formula proposed was compared with some experimental observations. And it is found that the results are in good agreement.