土拱效应原理求解挡土墙土压力方法的改进

Solution of problem of earth pressure on retaining wall calculated by method of soil arching effect

对应用土拱效应原理求解挡土墙主动土压力强度分布存在其所采用的滑裂面不满足墙后滑裂楔体水平力平衡等问题进行分析,提出水平力平衡的滑裂面水平倾角的计算方法;由此根据单元水平土层的静力平衡条件建立了竖向土压力强度、挡土墙主动土压力强度、土压力合力及其作用位置的计算公式。对运用该公式的计算结果与其他方法计算值及模型试验成果进行比较,结果表明文中方法安全性高且最接近试验结果。

The problems that the horizontal static equilibrium of the slice with the sliding surface of soil arching effect is not possible in calculating the distribution of the unit earth pressure on retaining wall are presented. And according to the static equilibrium of horizontal-stratum soil in the sliding wedge, the equation of calculating the angle of failure line to horizontal are formed. Equations of calculating the unit earth pressure, the resultant earth pressure and the points of application of resultant earth pressure on retaining wall are set up. Comparison among the results calculated by formula presented here and the other methods and the experimental observations is made. It is demonstrated that the calculating results by this paper＇s method have better safety and agreement with those of the experimental observations than those by the other methods.