基于统一强度理论的土压力极限上限分析

Upper-bound limit analysis of earth pressure based on unified strength theory

基于统一强度理论,采用塑性极限上限分析方法,建立了土压力问题的多三角形破坏机构,推导了基本计算公式,并编制了程序对土压力问题进行了研究。得到考虑中间主应力效应的土压力计算公式,通过改变统一强度理论参数,可获得一系列计算结果,并与已有研究成果进行了对比分析,表明计算结果合理,是一种严格的上限解。同时本文的计算方法可进行强度理论效应的研究。

Based on unified strength theory, multi-triangle failure mechanism was considered in the framework of upper-bound method of the plastic limit analysis theory, some basic formulae were deduced, the programme for calculating earth pressure was compiled, and the earth pressure formula that considered the effect of intermediate principal stress was obtained. A series of results could be presented by means of changing the parameter of unified strength theory. These results were compared with other results, and the calculating method could be used to study the effect of the strength theory. These solutions were rigorous upper-bound ones with respect to the solutions for an associated flow rule of Coulomb material.