平移模式下挡墙非极限土压力计算方法

在考虑挡墙平动位移效应和内摩擦角折减系数的基础上,利用薄层斜条分法,提出墙后填土为无黏性土时挡墙非极限主动和被动土压力计算公式。为验证该方法的可行性,对平移模式下挡墙进行主动和被动土压力模型试验,并利用该方法对2个模型试验进行计算分析。试验及计算结果均表明:不同s/sc比值情况下,主动土压力随深度增加表现出先增大后减小的趋势,且在0.6H(H为挡土墙高度)位置与库仑土压力曲线出现交点;被动土压力沿深度非线性增大,但其值均小于库仑被动土压力值;主动土压力合力作用点位置均高于库仑土压力合力作用点,而被动土压力合力作用点位置均低于库伦土压力合力作用点,并且随着s/sc比值的提高差距越大。

A METHOD FOR CALCULATING UNLIMITED EARTH PRESSURE OF RETAINING WALL WITH TRANSLATION MODE

Considering the movement effect of translation mode,the friction angle reduction coefficient and the method of bevel-layer analysis,a method for calculating the unlimited active and passive earth pressures is deduced for cohesiveless soil retaining wall with translation mode.In order to validate the feasibility of the proposed approach,two model tests for active and passive earth pressures were conducted in laboratory,respectively;and the proposed method was used to analyze the two models.Experimental and theoretical results indicate that the curve of active earth pressure increases firstly and decreases then along the depth of retaining wall with different values of s/sc,and it has a point of intersection with the curve of Coulomb active earth pressure at the depth of 0.6H,where H is the wall height.The passive earth pressure keeps increasing along the depth of retaining wall and is always smaller than the Coulomb passive earth pressure.Further study indicates that the action point position of the active earth pressure is higher than that of the Coulomb passive earth pressure,and the action point position of the passive earth pressure is lower than that of the Coulomb passive pressure.Moreover,with the increasing value of s/sc,the calculated and measured action point positions keep away from the action point position of the Coulomb earth pressure.