基于极限平衡条件的土体局部稳定分析  

Analysis on Local Stability of Soil Mass Based on Limit Equilibrium Condition

作　　者：邵龙潭[1] 刘士乙[1] 

机构地区：[1]大连理工大学工业装备结构分析国家重点实验室,辽宁大连116085

出　　处：《西北地震学报》2011年第3期209-211,217,共4页Northwestern Seismological Journal

基　　金：国家重点基础研究发展计划973项目(编号2010CB731502);工业装备结构分析国家重点实验室专项基金项目(S09104)

摘　　要：根据土体结构的应力及摩尔-库仑强度理论分析其局部稳定性。以土体内部任意曲面的剪应力积分值与抗剪强度积分值的比值为安全系数K,并认为|K-1.00|≤0.05为极限平衡状态。通过两个算例模拟了地基与均质边坡随外荷载增加,土体内部由局部达到极限状态发展成整体达到极限状态,最终失稳破坏的过程。结果表明此方法模拟土体结构渐进破坏过程是可行的。Based on the Mohr-Coulomb strength theory and the stress analysis of geotechnical engineering structures,the local stability of soil mass is conducted.In soil mass,ratio of the integral value of the shear stress and the integral value of the shear strength along any slip surface is defined as safety factor K,and when ｜K-1.00｜≤0.05,it is supposed to be reaching the limit equilibrium state.The numerical simulation results for two cases show that,with the increase of the load,soil mass or soil slope reache limit equilibrium state from part to globe,finally,to globe failure.It is also proved that this method is available to simulate the progressive failure process of soil mass.

关 键 词：土体 极限平衡条件 安全系数 局部破坏 有限元应力分析 

分 类 号：TU431[建筑科学—岩土工程]