基于统一强度理论的锚杆挡土墙可靠度分析  

An analysis of reliability of anchor retaining wall based on unified strength theory

作　　者：唐仁华[1] 陈昌富[1] 

机构地区：[1]湖南大学土木工程学院,长沙410082

出　　处：《水文地质工程地质》2011年第4期69-73,共5页Hydrogeology & Engineering Geology

基　　金：国家自然科学基金(50878082);交通部西部科技项目(200631880237)

摘　　要：将基于统一强度理论的岩土材料参数c、φ值引入到锚杆的抗拔力及规范推荐的粘性土广义库伦土压力中,以此建立锚杆挡土墙的功能函数。考虑岩土参数全部为正态分布与对数正态分布的两种情况,分别采用设计验算点法和JC法对一工程实例编制了考虑中主应力影响的可靠度计算程序。计算结果表明:锚杆挡土墙的可靠指标随中主应力影响系数b的增大而增大,且参数变异系数越小,增量越大;参数为对数正态分布的可靠指标比参数为正态分布时大,且两者的差量随b的增大而增大。The values of geotechnical material parameters,c and φ,based on unified strength theory,are used for the calculation of anchor pullout force and the generalized Coulomb earth pressure in cohesive soil recommended in the norm.The performance function of anchor retaining wall is established.Considering the geotechnical parameters for normal and lognormal distribution,and using design point method and JC method to program for a project case,the reliability program,which takes the effect of intermediate stress into account,is obtained.The results show that reliability index of anchor retaining wall increases with the increasing intermediate principal stress coefficient b and the increment is larger with the decrease in variation coefficient.The results also indicate that reliability index is larger as parameter change to lognormal distribution from normal distribution and the increment is larger with the increase of b.

关 键 词：统一强度理论 锚杆挡土墙 验算点法 JC法 可靠指标 

分 类 号：TU433[建筑科学—岩土工程]