一种超载与地震组合作用下的边坡滑动计算方法研究  

Research on a calculation method of slope slip under combined effects of overload and earthquake

作　　者：刘赟 徐媛 魏占玺 LIU Yun;XU Yuan;WEI Zhanxi(Qinghai Bureau of Environmental Geology Exploration,Xining,Qinghai 810001,China;Qinghai Engineering Research Center of Geoenvironment Protection and Geohazard Prevention,Xining,Qinghai 810001,China;Key Laboratory of Environmental Geology of Qinghai Province,Xining,Qinghai 810001,China)

机构地区：[1]青海省环境地质勘查局,青海西宁810001 [2]青海省地质环境保护与灾害防治工程技术研究中心,青海西宁810001 [3]青海省环境地质重点实验室,青海西宁810001

出　　处：《河北工业科技》2022年第1期56-62,共7页Hebei Journal of Industrial Science and Technology

基　　金：青海省地质勘察基金(2019-129号)。

摘　　要：为了探究极端环境条件对边坡稳定性的影响,针对超载与地震组合作用下的致滑因素进行了分析,基于能量法与强度折减法推导了组合作用下的安全系数F_(s)以及临界加速度系数K_(s),采用Matlab内嵌序列二次优化法求解极限值,并与经典解比较,最后选取汶川地震、熊本地震2条代表性地震波对边坡位移进行计算。结果表明,1)验证结果准确,推导方法可用于求解边坡临界系数;2)在2种破坏条件下,矿山边坡的稳定性受到显著影响,其安全系数F_(s)或者临界加速度系数K_(s)降低了近乎一半;3)应用Newmark法计算位移结果显示在地震荷载的作用下,超载边坡产生了数十倍的滑落距离。研究揭示了地震及顶部超载2种极端条件对边坡稳定性的显著影响,研究结果可为边坡稳定性评估提供参考。In order to explore the influence of extreme environmental conditions on the stability of the slope,the sliding factors under the combined action of overload and earthquake were analyzed and the safety factor F_(s) and the critical acceleration K_(s) under the combined action were derived based on the energy method and the strength reduction method.The limit value was solved by using sequence quadratic optimization method embedded in Matlab,and was verified with the classical solution.Finally,two representative seismic waves of Wenchuan earthquake and Kumamoto earthquake were selected to calculate the slope displacement.The results show that:1)the verification results are accurate,and the derivation method of this research can be used to solve the critical coefficient of slope;2)under the two failure conditions,the stability of the mine slope is significantly affected,and its safety factor F_(s) or critical acceleration factor K_(s) is reduced by nearly half;3)combining with Newmark method,the displacement results are calculated,which indicate that under the action of seismic load,the overloaded slope has produced dozens of times the sliding distance.The study reveals the significant impact of two extreme conditions of earthquake and top overload on slope stability.The results can provide certain reference opinions for the evaluation of slope stability in engineering construction.

关 键 词：岩土力学 地震边坡 超载作用 极限分析 位移 

分 类 号：U419[交通运输工程—道路与铁道工程]