挡土墙地震被动土压力及其分布的微分薄层计算方法  

Calculation Method of the Differential Thin Layer and Its Distribution of Retaining Wall under Seismic Passive Earth Pressure

作　　者：侯涛[1] 闫亚飞[1] 孙勇[1] 

机构地区：[1]贵州大学喀斯特环境与地质灾害防治教育部重点实验室,贵州贵阳550003

出　　处：《贵州大学学报（自然科学版）》2015年第5期95-99,共5页Journal of Guizhou University:Natural Sciences

基　　金：国家自然科学基金资助项目(51168009);贵州省科学技术基金资助项目(黔科合J字[2010]2245);贵州省优秀人才省长基金资助项目(黔省专合字2011-35)

摘　　要：本文基于微分薄层法思想推导出了地震条件下被动土压力沿竖直挡土墙墙高非线性分布时,挡土墙被动土压力的计算方法。该方法不仅适用于φ土,而且适用于c-φ土。经与朗肯土压力理论比较,在非动力条件下两者计算结果相似,说明在非动力条件下该方法可靠。在地震作用下,本文推导被动土压力计算结果比朗肯被动土压力计算结果低23.57%,重心下降0.24 m。挡土墙分层的前3层均为负值,由于土体为砂土不能承受拉力,表明前3层已经脱离墙壁,出现了拉裂缝。由此可知,地震力显著地改变了挡土墙的受力状态。The calculation of passive earth pressure of retaining structure under seismic condition of earthquake was studied through the method of derived differential method of thin layer. The method applies not only to sand soil, and is also suitable for the clay soil. By comparison with the Rankine~ earth pressure theory, under the normal condition, calculation results are similar, so the method is reliable in the normal condition. Under the condition of the earthquake, it was derived that the passive earth pressure in the calculation results was 23.57% lower than the passive earth pressure in calculation results, and the center of gravity drops of 0.24 m. Retaining wall before the layered 3 layers are negative, as the soil for sand cannot bear pulling force, it is suggested that the first 3 layer is out of the walls, the tensile fracture. Accordingly, the earthquake force significantly changed the stress of retaining wall.

关 键 词：地震 挡土墙 被动土压力 分层填土 

分 类 号：TU432[建筑科学—岩土工程]