三维边坡稳定弹塑性有限元分析与评价  

Appraisal and analysis of three-dimensional slope stability based on elastoplastic FEM

作　　者：方建瑞[1] 许志雄 庄晓莹[1] 

机构地区：[1]同济大学土木工程学院,上海200092 [2]福建省第一电力建设公司,福州350003

出　　处：《岩土力学》2008年第10期2667-2672,共6页Rock and Soil Mechanics

摘　　要：在边坡稳定分析有限元强度折减法的基础上,将二维分析推广到三维分析,研究了其安全系数的定义方式、屈服准则与失稳破坏标准等。算例分析表明,三维有限元分析比传统三维极限平衡方法和二维有限元分析更加符合实际,可以较好地模拟解决实际工程的计算问题。探讨了影响二维与三维分析结果的一些因素,通过分析得出结论:相同模型中选取Mohr内切圆屈服准则比选取外接圆屈服准则的计算结果偏于保守;三维边坡的侧向边界约束条件和长高比对计算结果影响较大,侧向边界全部约束时安全系数将大大增加,而安全系数随着长高比的增加逐渐减小。Based on the strength reduction method in slope stability analysis, two-dimensional analysis is promoted to three-dimensional slope analysis; and its definition way of safety factor, yield rule and destruction criterion are researched. The three-dimensional finite element analysis conform to the reality more than traditional three-dimensional limit equilibrium method and two-dimensional finite element analysis, and it may simulate the solution of practical project well by example. Also, some influential factors in two-dimensional and three dimensional analyses are discussed; and some conclusions are drawn as follows： the computed result by using Mohr inscribed circle yield rule is less than that by using Mohr circumcircle yield rule in the same model. The lateral boundary constraint condition and the ratio of length to height have well influence on the computed result; the safety factor will increase greatly when lateral is restrained completely, but reduce gradually along with the increase of ratio of length to height.

关 键 词：三维边坡 弹塑性有限元 强度折减法 安全系数 

分 类 号：TU457[建筑科学—岩土工程] TB115[建筑科学—土工工程]