简化楔体极限平衡图解法数解土压力探讨  

Numerical Solution of Earth Pressure by Simplified Wedge Limit Equilibrium Graphical Method

作　　者：陈伟平 陆建君 CHEN Weiping;LU Jianjun(Guangdong Ysd Surveying&Designing Co.,Ltd.,Foshan 528000,China)

机构地区：[1]广东粤水电勘测设计有限公司,广东佛山528000

出　　处：《广东水利水电》2023年第8期82-87,共6页Guangdong Water Resources and Hydropower

摘　　要：当挡土墙墙背非垂直光滑、墙后填土表面非水平时,一般采用库仑土压力理论计算土压力。当墙后填土为无黏性土时,采用小库仑公式计算土压力相对比较简便。当墙后填土为黏性土时,一般采用大库仑公式计算,也可采取图解法求解。图解法需拟定不同滑动面连续绘制多个闭合的力多边形,工作量大,实际应用较少。由于大库仑公式极其冗长,使用不便。该文考虑忽略墙背黏聚力,通过简化楔体极限平衡图解法分析推导出数解公式,达到数解法计算土压力的目的。该法计算简便,精度符合工程要求,在工程实践中具有较好的应用价值。When the back of the retaining wall is not vertical and smooth,and the filling surface behind the wall is not horizontal,the Coulomb's earth pressure theory is generally used to calculate the earth pressure.When the fill behind the wall is cohesionless soil,it is relatively simple to calculate the earth pressure using the small Coulomb formula.When the fill behind the wall is cohesive soil,the large Coulomb formula is generally used for calculation,and the graphical method can also be used for solution.The graphical method needs to draw up multiple closed force polygons continuously on different sliding surfaces,which requires a large amount of work and less practical application.Because the large Coulomb formula is extremely lengthy,it is inconvenient to calculate.In this paper,considering ignoring the cohesion of the wall back,the numerical solution formula is deduced by simplifying the wedge limit equilibrium graphical method to calculate the earth pressure.The method is simple and accurate,and has good application value in engineering practice.

关 键 词：楔体 极限平衡 图解法 数解 土压力 

分 类 号：TU43[建筑科学—岩土工程]