地震作用下矿山边坡永久位移非线性分析  

Nonlinear analysis of mine slope permanent displacement under seismic actions

作　　者：蒋魁 王帆[2] 蒋兴中 景鹏旭 JIANG Kui;WANG Fan;JIANG Xingzhong;JING Pengxu(China Nonferrous Guilin Mineral Geology Research Institute Co.,Ltd.,Guilin 541004,China;Guilin Mineral Geology Research Institute Engineering Co.,Ltd.,Guilin 541004,China;The First Geological Team of Guangxi Zhuang Autonomous Region,Guilin 541004,China;National Earthquake Response Support Service,Beijing 100049,China)

机构地区：[1]中国有色桂林矿产地质研究院有限公司,广西桂林541004 [2]桂林矿产地质研究院工程有限公司,广西桂林541004 [3]广西壮族自治区第一地质队,广西桂林541004 [4]中国地震应急搜救中心,北京100049

出　　处：《中国矿业》2020年第10期152-157,共6页China Mining Magazine

摘　　要：地震作用下矿山边坡的稳定性一直是热点话题,而岩土体非线性强度特征对边坡安全影响更为显著。本文以不同破坏条件下的矿山边坡为研究对象,考虑岩体后缘抗拉强度折减的作用,选取极限分析法中平面应变的对数螺旋旋转机制构建屈服加速度的功能方程,以计算不同坡角、内摩擦角、顶部荷载强度、地震荷载以及张拉折减系数下的矿山边坡的稳定性;采用经典Newmark法对贺州市某矿山项目中典型矿山边坡位移进行推导计算。研究结果表明:考虑非线性破坏对于边坡屈服加速度的影响显著,而顶部荷载加剧屈服加速度的折减;考虑后缘张拉强度折减后矿山边坡的位移可达到传统分析的近2倍。因此,考虑岩土体抗拉强度折减的影响对矿山边坡的抗震稳定性设计至关重要。The stability of mine slopes under earthquake has always been a hot topic,while the nonlinear strength of rock and soil have a more significant impact on slope safety.In this paper,the stability of mine slopes under different failure conditions are studied with the influence of tension cut-off.The plane strain logarithmic spiral rotation mechanism of limit analysis is selected to derive the work equation of yield acceleration under various combination of slope angle,frictional angle,overload coefficient,seismic load and tension cut-off factor.The classical Newmark method is used to derive and calculate the displacement of a typical mine slope in a mining project in Hezhou city.The results show that the tension cut-off has huge influence on yield acceleration of slope while the overload would cause greater reduction of the yield acceleration.On the other hand,the permanent displacement of mine slope considering tension cut-off would be two times of its counterpart without considering tension cut-off.As a result,the consideration of tension cut-off is critical to the seismic stability design of mine slope.

关 键 词：非线性强度 极限分析 屈服加速度 位移 地震作用 矿山边坡 

分 类 号：TU411[建筑科学—岩土工程]