基于土拱效应原理求解挡土墙被动土压力

对平移模式下的刚性挡土墙和滑裂面间的楔形土体处于被动极限平衡状态的应力进行分析，考虑墙面和滑裂面之间土体水平力平衡，运用土拱效应原理推导出被动土压力系数和滑裂面水平倾角。并根据水平单元土体的静力平衡条件建立平衡方程，提出被动土压力分布、土压力合力及其作用位置的公式。将公式计算结果与试验结果以及库仑、朗肯理论所得结果进行比较，结果表明，与试验结果接近，验证了所得计算方法的合理性。

Passive earth pressure on retaining walls calculated by principle of soil arching effect

In the translational displacement mode,a stress of wedge soil between rigid retaining wall and sliding surface,which is in the passive state of limit equilibrium,is analyzed.Considering the horizontal equilibrium of the soil between the wall and the slip surface,the formula of passive earth pressure coefficient and the angle of failure line to horizontal are obtained by using the principle of soil arching effect.According to the equilibrium equation considering the static equilibrium conditions of horizontal unit of soil,the formula of the passive earth pressure distribution,the resultant earth pressure and the application point of resultant earth pressure on retaining wall are respectively set up.After comparing the computed result using the method mentioned above with the experiment results and the results obtained on the basis of Coulomb and Rankine theories,it is demonstrated that the calculating results agree well with the experimental results;and thus the calculating method obtained is verified rational.