基于土拱效应的刚性挡墙墙后主动土压力

考虑平移模式下刚性挡土墙墙后填土中的土拱效应,采用中心圆弧拱迹线法得到了不同填土内摩擦角和墙土摩擦条件下,挡土墙的滑裂面倾角和侧向主动土压力系数。在此基础上,采用水平微分层法求解得到了作用在挡土墙上的主动土压力、主动土压力合力及其作用点的解析式。与前人理论研究成果及试验监测结果的对比分析表明：本文理论得到的平移模式下刚性挡墙墙后主动土压力合力略小于Paik和应宏伟计算结果,大于章瑞文计算值；土压力合力作用点高于Paik理论解和应宏伟计算结果；侧向主动土压力系数与Paik理论解和应宏伟理论解基本相等。相较于其它方法,本文理论得到的刚性挡墙墙后主动土压力分布与模型试验结果吻合得更好。

Active earth pressure against rigid retaining wall considering soil-arching effects

Based on the theory of soil-arching effects, the inclinations of sliding surface and the active earth pressure ratios are obtained under various friction angles of backfill and wall-soil friction. The results are adopted in the analysis of the active earth pressure against the rigid retaining wall undergoing horizontal translation by means of the differential level layer method. The expressions for the active earth pressure, active earth resultant force and loading point are derived. Compared with the theoretical solutions of Coulomb, Paik, Ying Hongwei, Zhang Ruiwen and results of physical model tests, the present simulations match better with the physical model tests than the other theoretical solutions. The calculated earth resultant forces are smaller than those of Paik and Ying Hongwei and larger than those of Zhang Ruiwen. The location of loading point of the resultant force is higher than that of Paik and Ying Hongwei. The lateral earth pressure coefficient is approximately equal to that of Paik and Ying Hongwei.