孔隙水压力效应下挡土墙主动土压力上限解

Upper bound solutions of active earth pressure of retaining wall considering pore water pressure

孔隙水是影响土体稳定性的主要因素。本文将孔隙水压力视为外力作用在土体上,采用极限分析上限定理推导出孔隙水效应下主动土压力的解析解,并且采用穷举法得到了主动土压力的最大值以及最危险破裂面。研究表明:土体的抗剪强度指标、地表荷载、孔隙水对挡土墙的主动土压力以及土体潜在破裂面的位置有显著影响,其中孔隙水的影响最大,建议在实际工程中进行防排水设计,尽量减小孔隙水的影响。

Pore water is a main factor of affecting the soil stability.The pore water pressure is regarded as an external force acting on the soil.The analytical solution of active earth pressure under the effect of pore water is derived with the upper bound theorem,and the maximum of active earth pressure and the most dangerous failure surface are obtained by the exhaustive method.The results show that the shear strength index of soil,surface load and pore water have significant effects on the active earth pressure and the location of potential failure surface.It is suggested that waterproof and drainage design should be carried out,and the influence of pore water should be minimized in actual projects.