基于可靠度逆分析理论的公路挡土墙稳定安全系数研究  

Study on Stability Safety Factors of Highway Retaining Wall Based on Inverse Reliability Theory

作　　者：骆佐龙 徐航 董峰辉 LUO Zuolong;XU Hang;DONG Fenghui(Department of Civil Engineering,Shanxi University,Taiyuan 030000,China;Department of Bridge Engineering,Tongji University,Shanghai 200092,China;College of Civil Engineering,Nanjing Forestry University,Nanjing 210037,China)

机构地区：[1]山西大学土木工程系,太原030000 [2]同济大学桥梁工程系,上海200092 [3]南京林业大学土木工程学院,南京100022

出　　处：《结构工程师》2020年第2期65-70,共6页Structural Engineers

基　　金：山西省自然科学基金项目(201901D211121)。

摘　　要：针对公路挡土墙整体稳定性安全评价问题,在可靠度逆分析理论的基础上,提出了基于可靠度混合算法的公路挡土墙稳定安全系数计算方法,主要包括三个层面的工作:一是随机变量的选择;二是稳定安全系数评价表达式的建立;三是稳定安全系数计算。以一座公路挡土墙为工程实例,应用该方法进行稳定性安全评价,结果表明:基于确定性安全评价模型计算得到的挡土墙稳定安全系数均大于基于可靠度逆分析理论的计算结果。最后,对影响稳定安全系数的各参数进行敏感性分析,结果表明:稳定安全系数对目标可靠指标和土性设计参数较为敏感,对安全系数初始迭代值不敏感,本方法具有迭代初值选取的鲁棒性,迭代计算过程稳定可靠。Aiming at the safety evaluation for overall stability of highway retaining wall,a method,based on a hybrid algorithm of the inverse reliability theory,is proposed for the stability safety factor calculation of a highway retaining wall,which mainly includes three aspects.The first is selection of random variables;the second is establishment of the evaluation expression for the stability safety factor;and the third is calculation for the stability safety factor.Taking a highway retaining wall as an example,the method proposed in this study is applied to evaluate safety of the overall stability.The results show that the safety coefficients of overall stability for the retaining wall calculated based on the deterministic safety evaluation model are larger than those calculated based on the inverse reliability theory.Finally,sensitivity of the parameters which affect the stability safety factors is analyzed.The results show that the stability safety factor is sensitive to the target reliability index and soil property value,but not to the initial iteration value of the safety factor,which demonstrates that the method proposed in this article is robust with initial value selection,and the calculation process is stable and reliable.

关 键 词：公路挡土墙 整体稳定 可靠度逆分析 安全系数 敏感性分析 

分 类 号：U417.11[交通运输工程—道路与铁道工程]