某弃渣场边坡稳定性的可靠度分析  

Stability reliability analysis of an abandoned dreg site slope

作　　者：吴谦 毛雪松[1] 刘龙旗 刘飞飞[1] 宋玉品 

机构地区：[1]长安大学公路学院,西安710064

出　　处：《桂林理工大学学报》2017年第3期475-480,共6页Journal of Guilin University of Technology

基　　金：国家自然科学基金项目(51378072);中央高校基本科研业务费专项资助项目(310821162012;310821161023)

摘　　要：弃渣场是隧道工程的重要附属设施,其稳定性对铁路、公路等工程的安全运营具有重大意义。以中南某铁路隧道新近堆积弃渣场为研究对象,考虑各项计算参数的不确定性和不同滑动形式,分析了边坡稳定系数对参数的敏感性,并借助Monte Carlo算法对其稳定性可靠度进行研究。结果表明:边坡的稳定性系数对弃渣内摩擦角φ的变异最为敏感,其次为粘聚力c,对弃渣重度γ变化的敏感性最低。以25年作为暴雨重现期,由于边坡内部弃渣基质吸力变化较表层土体的滞后效应,边坡的稳定系数在雨后48 h达到最低,依据规范,取F_(st)=1.15作为暴雨工况边坡的稳定控制标准,暴雨条件下该弃渣场边坡局部处于非稳定状态的概率为16.8%,而沿原始地面发生整体滑动的概率为0。Abandoned dreg site is an important affiliated facility of tunnel engineering,its stability is of great significance to the safety of highway and railway.A recently abandoned dreg site slope in south-central China is taken as the research object.The sensitivity of Fswith the variation material parameters is analyzed,and Monte Carlo method is adopted for its stability reliability evaluation,considering the parameter uncertainty and different sidling modes.The results show that the Fsis most sensitive to the friction angle of the dreg,while cohesion is secondary,and least sensitive to the material weight.Due to the hysteresis of matrix suction inside the slope,Fs meets the minimum at 48 hours after the rain when encounters a storm with a recurrence period of 25 years.Taking Fst= 1.15 as the stability criterion standard in the storm condition according to the current design code,the partial unsteady state probability of the slope is 16.8%,and its overall unsteady state probability is 0.This article provides some reference for the study on the stability of similar slope.

关 键 词：弃渣场 边坡 稳定性 蒙特卡罗法 敏感性 可靠度 

分 类 号：U416.14[交通运输工程—道路与铁道工程]