地震作用下含岩桥边坡系统可靠性分析  

Reliability analysis of rock bridge slope system under earthquake action

作　　者：李亮[1] 文子祥 王中伟 唐高朋[1] 赵炼恒[1,3,4] LI Liang;WEN Zixiang;WANG Zhongwei;TANG Gaopeng;ZHAO Lianheng(School of Civil Engineering,Central South University,Changsha 410075,China;China Railway Shanghai Bureau Group No.5 Engineering Co.,Ltd.,Nanning 53000,China;Key Laboratory of Heavy-haul Railway Engineering Structure,Ministry of Education,Central South University,Changsha 410075,China;Hunan Provincial Key Laboratory for Disaster Prevention and Mitigation of Rail Transit Engineering Structures,Central South University,Changsha 410075,China)

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]中铁上海局集团第五工程有限公司,广西南宁530000 [3]中南大学高速铁路建造技术国家工程实验室,湖南长沙410075 [4]中南大学轨道交通工程结构防灾减灾湖南省重点实验室,湖南长沙410075

出　　处：《铁道科学与工程学报》2021年第10期2572-2582,共11页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(51978666,51878668);贵州省科学技术厅-科技支撑计划重点项目(黔科合支撑[2018]2815)。

摘　　要：对于岩质边坡而言,节理面是边坡的失稳潜在影响因素。在地震作用下,地震所产生的附加力会进一步影响边坡的稳定性。基于平面岩质边坡模型,研究其在地震作用下的稳定性,并对其系统可靠性进行评估。采用极限平衡法推导平面型岩质边坡安全系数的计算公式,并利用拉丁超立方体抽样(LHS)方法估算其可靠性。以此确定不同的破坏模式对系统可靠性指标的影响程度,并分析不同的参数以及张拉裂缝位置对平面型岩质边坡可靠性的影响。研究结果表明:在系统可靠性评估过程中,LHS方法有着较高的计算效率。平面型岩质边坡各种破坏模式对系统可靠性的影响程度有所差异。张拉裂缝位于坡顶时其倾角以及水平地震因子对系统可靠性指标的影响均较为显著。边坡破坏概率随着块体裂隙连通率的增大而显著增加。For the rock slope,the joint surface is a potential influencing factor for the slope instability.Under the action of earthquake,the additional force damage caused by earthquake further affects the stability of the slope.In this paper,the stability of plane rock landslide and system reliability was studied based on the rock slop model.The limit equilibrium method was used to derive the calculation formula of the safety factor of plane rock slope,and the Latin hypercube sampling(LHS)method was used to estimate its reliability.In this way,the influence degree of different failure modes on the system reliability index was determined,and the influence of different parameters and the location of tension cracks on the reliability of plane rock slope was analyzed.The results show that the LHS method has high computational efficiency in the process of system reliability evaluation.Different failure modes of plane rock slope have different influence on system reliability.When the tension fracture is located at the top of the slope,its dip angle and horizontal seismic factor have significant influence on the system reliability index.The failure probability of slope increases significantly with the increase of fracture connectivity.

关 键 词：系统可靠性 平面型岩质边坡 超立方体抽样 节理连通率 地震荷载 

分 类 号：U416.14[交通运输工程—道路与铁道工程]