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基于库仑土压力理论的基本假定和拟动力法的分析思路,以无黏性填土的刚性挡土墙为研究对象,考虑填土中存在竖向稳定渗流的两种工况,推导了地震主动土压力和修正土压力系数的计算表达式。通过程序求解问题并进行参数讨论,分析结果表明,主动土压力随水平地震加速度的增大而明显增大,竖向地震加速度对土压力影响较小,可以忽略不计。墙土摩擦角较小时,土压力随填土摩擦角的增大而单调减小,但当墙土摩擦角增大后,土压力随填土摩擦角的增大出现先减小后增大的情况。渗流方向向下时,土压力随水力梯度的增大而减小;渗流方向向上时,变化规律则相反。与已有的理论方法对比,计算结果基本吻合,验证了该理论方法的正确性。
Based on the basic assumptions of Coulomb’s theory of soil pressure and the analysis of quasi-dynamic method, the rigid retaining wall without viscous filling is taken as the research object. Considering the two conditions of vertical and steady seepage in the filled earth, the seismic active Computation of earth pressure and earth pressure coefficient. Solving the problem and discussing the parameters through the program, the analysis results show that the active earth pressure increases obviously with the increase of horizontal earthquake acceleration, and the vertical earthquake acceleration has less influence on earth pressure, which can be neglected. When the friction angle of the soil is small, the earth pressure monotonically decreases with the increase of the friction angle, but when the friction angle of the soil increases, the earth pressure decreases and then increases with the increase of the friction angle Happening. When the direction of seepage flows downward, the earth pressure decreases with the increase of hydraulic gradient. When the direction of seepage flows upward, the change rule is opposite. Compared with the existing theoretical methods, the calculated results are basically consistent, which verifies the correctness of the theoretical method.