基于土拱效应的挡墙后砂土主动土压力计算分析

为研究土拱效应下挡土墙后砂土的主动土压力,考虑墙土摩擦角对土体滑裂面倾角的影响,对圆弧形的小主应力拱进行理论分析,计算得到不同深度处的土拱微分体水平宽度及小主应力拱形状表达式。根据所得的拱形状,提出沿小主应力拱轴方向划分微分单元体的拱弧微分单元法,并将其用于求解挡土墙主动土压力,得到了挡土墙主动土压力的理论公式。与试验数据及其他理论方法的比较表明该方法所得理论公式与模型试验结果吻合得较好。

Calculation and analysis of active earth pressure on retaining walls considering soil arching effects

In order to study the active earth pressure on retaining walls in response to soil arching effects, considering the effect of wall friction angles on the inclination of sliding planes, theoretical analysis was applied to minor principal stress arches. The horizontal width of soil arch differential elements at different depths was calculated, and the expression for the shape of minor principal stress arches was obtained. According to the arch shape obtained, a differential element method was developed, in which differential elements were divided along the axis of minor principal stress arches. Then, this method was used to compute the active earth pressure on retaining walls, and a theoretical formula was obtained. Comparison of the present results with experimental data and results from other theoretical methods shows that the results from the present theoretical formula agree with those of the model test.