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库仑理论假定挡土墙后填土破裂面为一直线,然而众多试验和理论表明墙后填土破裂面为一曲线。考虑土拱效应,并假设土体破裂面为旋轮线,土拱形状为圆弧形,根据应力分析得到了侧土压力系数的表达式,利用水平层分析法,推导出挡土墙在平动模式下主动土压力的分布、总土压力和总土压力作用点高度的计算式,并用模型试验与现有理论进行对比。结果表明:挡土墙主动土压力计算结果与模型试验结果吻合,侧土压力系数与直线破裂面结果有明显差异,当墙土间摩擦角与土体内摩擦角比值较大时,总土压力比库仑理论计算结果大。
Coulomb’s theory assumes that the backfill surface of retaining wall is a straight line, however, many experiments and theories show that the fractured surface of backfill is a curve. Considering the effect of soil arching and assuming that the rupture plane of the soil is a roller line and the shape of the soil arch is circular, the expression of the lateral earth pressure coefficient is obtained according to the stress analysis. By using the horizontal layer analysis method, Active earth pressure distribution in dynamic mode, total earth pressure and total earth pressure acting point height calculation formula, and the model test and the existing theory are compared. The results show that the calculated result of active earth pressure on retaining wall agrees well with the model test results, and the difference between lateral earth pressure coefficient and rectilinear rupture plane is obviously different. When the ratio of friction angle between soil and wall is larger, the ratio of total earth pressure Coulomb theory results are large.