基于JC法的地震作用下土坡动力可靠度分析  

Dynamic Reliability Analysis on Earth Slopes under Earthquake based on JC Method

作　　者：罗浩 李逸 郑博 邹琦 LUO Hao;LI Yi;ZHENG Bo;ZOU Qi(Central and Southem China Munlclpal Englneering Design&Research institute Co.,Ltd.,Wuhan 430010,China)

机构地区：[1]中国市政工程中南设计研究总院有限公司,武汉市430010

出　　处：《北方交通》2020年第4期61-65,69,共6页Northern Communications

摘　　要：针对土体参数的随机性,以土体重度、粘聚力和内摩擦角为基本变量,提出了一种地震作用下土坡动力可靠度时程的计算方法。首先建立地震作用下土坡的运动方程,求出土中动应力解,再采用整体圆弧滑动法建立土坡稳定的极限状态方程,运用JC法,最终实现地震作用下土坡的动力可靠度分析。结合工程实例,进行了地震响应分析,计算了地震作用下土坡的失效概率和可靠度时程曲线,并与拟静力法的计算结果进行对比,算例分析表明,由于考虑到地震特性和土体的动力特性,求得的可靠度要小于拟静力法的计算结果,表明该动力分析方法分析地震作用下土坡的稳定性更可靠。In view of the randomness of soil parameter,unit weight,cohesion and inner angular of soil are treated as basic variables,this paper proposes a calculation method of soil slope dynamic reliability time-history curve under seismic.Firstly,motion equations of soil slope under seismic loading isestablished to seek out thedynamic stress.Full-scale loading method is applied on the soil slopestability analysis to get the limit state equation.Finally,the soil slope reliability analysiscome truecombined with JC method.Seismic response is analyzed,the failure probability and reliabilitytime-history curve of the soil slope is calculated and comparedwith the calculation results of pseudo static method through specific engineering example.The exampleshows thatthe earthquake characteristics and dynamic characteristics of the soil are considerd in this paper,the calculation results of reliability is smaller than pseudo static method.Themethod proposed in this paperis more reliable in slope dynamic stability analysis under earthquake.

关 键 词：土坡 地震作用 整体圆弧滑动法 JC法 动力可靠度 

分 类 号：U414.14[交通运输工程—道路与铁道工程]