基于上限分析的挡土墙土压力及敏感性研究  

STUDY THE EARTH PRESSURE AND SENSITIVITY ON RETAINING WALL BASED ON THE UPPER LIMIT ANALYSIS

作　　者：蒋方媛 汪辉洋 王艳 王志远 高延超[2] JIANG Fang-yuan;WANG Hui-yang;WANG Yan;WANG Zhi-yuan;GAO Yan-chao(Shenzhen Survey and Research Institute Co.,Ltd.,Shenzhen 518026,China;Chengdu Geological Survey Center,China Geological Survey Bureau,Chengd1u 610081,China)

机构地区：[1]深圳市勘察研究院有限公司,深圳518026 [2]中国地质调查局成都地质调查中心,成都610081

出　　处：《地质灾害与环境保护》2024年第4期86-90,104,共6页Journal of Geological Hazards and Environment Preservation

基　　金：四川省自然科学基金(23NSFSC0297)。

摘　　要：为简便准确计算挡土墙土压力,采用上限分析方法对挡土墙土压力问题开展分析。假定墙后滑动土楔为三角形形状,选取更符合实际的适应度函数,建立基于上限分析的土压力计算公式,获得了合力作用点距墙底高度的计算方法。通过搜索算法得到滑动土楔的滑裂角,对均布荷载条件下的挡土墙土压力展开更直观地求解,计算结果与库伦土压力的结果对比,表明了该算法是合理、可靠的。采用正交试验,对影响土压力的关键参数开展敏感性分析。对于主动土压力及被动土压力情形下,敏感度大小排序均为填土内摩擦角>墙土外摩擦角>墙背倾角>填土面倾角。在多层土情形下,根据填土倾角方向划分土层,讨论了基于上限分析的多层土情形下的挡土墙土压力计算方法。To facilitate the accurate computation of earth pressure on retaining walls, an upper bound analysis method was employed to address this issue. Assuming the shape of the sliding soil wedge behind the wall as triangular, a fitness function that more realistically represents actual conditions was selected. This approach established a formula for calculating earth pressure based on upper bound analysis and derived a method to determine the height above the wall base at which the resultant force acts. The angle of sliding failure was ascertained using a search algorithm, allowing for a more intuitive solution to the earth pressure on retaining walls under uniformly distributed load conditions. Comparisons with Coulomb?s earth pressure theory validate the reliability and reasonableness of this algorithm. Orthogonal experiments were conducted to perform a sensitivity analysis on key parameters affecting earth pressure. The sensitivity ranking for both active and passive earth pressure scenarios is as follows: internal angle of friction in the fill > external angle of friction between wall and soil > angle of the wall's back inclination > angle of the ground surface of the fill. In cases of multilayered soil, the layers were differentiated based on the direction of the ground surface angle, and the method for calculating retaining wall earth pressure in multilayered soil scenarios using upper bound analysis was discussed.

关 键 词：挡土墙土压力 上限分析 敏感性分析 正交试验 适应度函数 

分 类 号：TU432[建筑科学—岩土工程]