考虑土拱效应的挡土墙地震主动土压力静力研究

摘要

在 Mononobe-Okabe 拟静力学理论的基础上，对挡土墙后填土进行应力分析，根据静力平衡求得滑裂面水平倾角。再结合土拱效应原理采用水平层分析法，对处于正常受力状态的填土微元体进行应力分析，并根据静力平衡和力矩平衡建立方程组，从而求得适用范围更广的地震作用下墙后土体的主动土压力、土压力系数、土压力合力作用点位置等的计算公式。利用数值方法分析土内摩擦角、墙土面摩擦角以及水平和竖向地震系数对滑裂角、主动土压力、土压力系数、土压力合力作用点位置的影响，并将计算结果与其他计算方法所得结果以及试验结果进行对比分析。%On the basis of quasi-static theory of Mononobe-Okabe,the angle of sliding surface is obtained according to the static equilibrium after analyzing the stress of the filling behind retaining wall. Considering soil arching effect,the static equilibrium and moment equilibrium equations are then derived from analysis of the stress of microelement of filling layer which is in a normal stress state,using the method of horizontal layer analysis. After that,the formulas of active earth pressure,coefficient of earth pressure and action point of resultant force of filling behind the retaining wall under seismic activity,which are more usable,are respectively obtained. The influences of internal friction angle,wall friction angle,horizontal and vertical seismic coefficients on the angle of sliding surface,active earth pressure,coefficient of earth pressure and action point of resultant force are numerically analyzed. Furthermore,the results obtained by the proposed method are compared with those computed by other methods and experimental observation.