考虑渗流和锚固作用的强度折减有限元法研究  

STUDY ON STRENGTH REDUCTION FEM CONSIDERING SEEPAGE AND BOLT

作　　者：韦立德[1] 陈从新[1] 徐健 胡绍民 

机构地区：[1]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉430071 [2]湖北泸蓉西高速公路指挥部,湖北恩施445000

出　　处：《岩石力学与工程学报》2008年第A02期3471-3476,共6页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家重点基础研究发展规划(973)项目(2002CB412704);中国科学院武汉岩土力学研究所博士科研启动基金资助项目(O721031Q01)

摘　　要：针对目前岩土工程中锚杆数值模型存在的局限性,探索适合于强度折减有限元法计算和参数优化的新的锚杆计算模型,研制出一个考虑渗流场和由于泡水含水量变化引起岩土体强度参数降低及锚杆支护作用的三维强度折减有限元程序,该锚杆计算模型能够考虑锚杆和岩土体间黏结力不够的锚杆失效形式。通过实例计算并与传统极限平衡法实例计算分析结果对比研究,对抗剪强度折减有限元法分析边坡稳定问题的适用性进行评价。结果表明,采用三维强度折减有限元法确定考虑渗流场和由于泡水含水量变化引起岩土体强度参数降低及锚杆支护作用的边坡稳定性安全系数是可行的。Due to the limitation of the numerical models of rock bolt by finite element method（FEM） in geotechnical engineering at present, the bolt model suitable for the FEM of strength reduction method and optimization of anchor parameters is exploited. The program of the 3D FEM considering seepage and the action of bolt is developed, in which the failure model of bolt because of lowness of cohesion between the bolt and the soil around can be considered as well. Through comparison of the calculation of FEM and limit equilibrium method, the applicability of FEM to analyze the slope stability is evaluated. The comparison result shows that the finite element method is feasible to analyze the stability of the slope considering seepage and strength reduction caused by seepage and the action of bolt.

关 键 词：岩石力学 边坡稳定性 渗流 强度降低 锚杆 弹塑性有限元 

分 类 号：TU45[建筑科学—岩土工程]