平面应变状态下基于统一强度理论的土压力计算  

EARTH PRESSURE THEORY BASED ON UNIFIED STRENGTH THEORY UNDER PLANE STRAIN STATE

作　　者：应捷 廖红建[1] 蒲武川 

机构地区：[1]西安交通大学建筑与力学学院,西安710049

出　　处：《岩石力学与工程学报》2004年第z1期4315-4318,共4页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金(50379043);中国科学院武汉岩土力学研究所岩土力学重点实验室开放课题基金(Z110302)资助项目。

摘　　要：运用统一强度理论,推导了在平面应变状态下的极限应力状态平衡方程,并将其引入Rankine土压力理论并加以改进,提出了基于统一强度理论的主、被动土压力系数及土压力公式。得出基于Mohr-Coulomb强度理论的Rankine土压力公式是该公式的特例。运用工程实例,计算了在不同权系数b值下的土压力沿深度分布曲线,论证了中间主应力σ2对土压力的影响。实例证明考虑中间主应力σ2的土压力计算结果更符合实际情况。Based on the unified strength theory,the ultimate equilibrium stress equation under plane strain state is deduced and introduced into the Rankine earth pressure theory.Then the coefficients of active and passive earth pressure and the calculation formulas of earth pressure based on the unified strength theory are proposed.It is shown that the formula of Rankine earth pressure based on the Mohr-Coulomb strength theory is a particular case of the presented formulas.The earth pressure along the depth in a practical project is calculated with different weight coefficients which reflect the influence of intermediate principal stress,and the results prove that calculation results of earth pressure considering intermediate principal stress are closer to the practical situation than those without considering intermediate principal stress.

关 键 词：土力学 统一强度理论 极限平衡方程 Rankine土压力理论 中间主应力 

分 类 号：TU473.2[建筑科学—结构工程]