软弱基底排土场边坡破坏模式模型试验研究  

Research on failure mode of slope dump on soft layer by model test

作　　者：陈冲 吕华永 高海南 李世俊[4] 魏臻 常毛毛 王卫 CHEN Chong;LV Huayong;GAO Hainan;LI Shijun;WEI Zhen;CHANG Maomao;WANG Wei(Department of Engineering Physics,Tsinghua University,Beijing 100084,China;School of Resources and Safety Engineering,China University of Mining and Teehnology（Beijing）,Beijing 100083,China;School of Mechanics and Civil Engineering,China University of Mining and Technology（Beijing）,Beijing 100083,China;School of Civil Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]清华大学工程物理系,北京100084 [2]中国矿业大学(北京)资源与安全工程学院,北京100083 [3]中国矿业大学(北京)力学与建筑工程学院,北京100083 [4]清华大学土木水利学院,北京100084

出　　处：《岩石力学与工程学报》2018年第9期2093-2109,共17页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家重点研发计划(2016YFC0801602)~~

摘　　要：为了全面分析软弱基底排土场边坡潜在破坏模式及渐进破坏全过程,开发模型试验的非接触测量系统,其中,图像采集子系统获取试验过程中的高清照片,测量分析子系统基于散斑技术和追踪技术获取模型表面位移场和标志点时程曲线。基于模型试验的非接触测量系统,对软弱基底排土场边坡开展一系列底摩擦试验,试验结果表明,软弱基底排土场边坡的破坏具有渐进性,破坏始于坡脚,并沿着基底软弱层向坡体深部逐渐扩展,最终在坡体后部形成贯通滑面,边坡发生整体滑动。破坏裂缝可以分为2种类型:错动裂缝,裂缝主要为错动变形,并伴随水平分离,主要分布在坡体内部;拉张裂缝,裂缝主要为水平分离,并伴随错动变形,主要分布在坡体后缘。研究结果为软弱基底排土场边坡稳定性评价方法和防治措施的选择提供了依据。In order to predict the potential failure mode and the entire process of progressive failure of dump slope,a non-contact measurement system developed for model testing is presented.The image acquisition subsystem collects the high resolution photographs during the test.The measurement and analysis subsystem obtains the surface displacement of model and the time curve of displacement at marked points with the speckle technique and tracking technology.With the non-contact measurement system,a series of model tests studying the bottom friction of slope dump on soft layer were performed.The test results show that the failure of slope dump on soft layer is progressive.The failure begins in the toe of the slope and expands gradually towards the deep part of the slope along the weak layer.A through sliding surface is finally formed in the rear part of the slope,then the entire slope slides.The failure cracks can be divided into two types：dislocation cracks with mainly the dislocation deformation and accompanied by horizontal separation,are mainly distributed in the interior of the slope;tension cracks with mainly horizontal separation and accompanied by the dislocation deformation,are mainly distributed in the rear part of slope.

关 键 词：边坡工程 软弱基底 排土场边坡 破坏模式 底摩擦试验 

分 类 号：P642[天文地球—工程地质学]