某露天煤矿边坡失稳破坏模式与稳定性分析new.doc

某露天煤矿边坡失稳破坏模式与稳定性分析 黄明利，管晓明 （北京交通大学土木建筑工程学院，北京 100044） 摘 要：针对某露天矿边坡工程，介绍了工作帮和非工作帮边坡工程背景和滑坡现状，结合地形与地貌、工程地质和水文地质条件，分析了影响边坡稳定的主要因素及破坏模式。结果表明：持续的降雨和大规模露天开采是滑坡的外在因素，不利的地貌特征、岩土体的自身性质较差及软弱层构造是其内在因素，滑坡破坏模式表现为顺层滑坡、圆弧滑坡、圆弧-顺层滑坡和崩塌4种形式。运用基于有限单元法的MIDAS GTS软件构建了边坡三维地质模型，采用强度折减法计算了稳定系数，进行了稳定性分析和评价，并采用毕肖普法对几种工程性质较差的土层进行了边坡台阶高度参数的优化分析。结果表明：工作帮坡顶砂土位移位移 关健词：露天矿边坡；影响因素；破坏模式；稳定性分析；台阶参数优化 中图分类号：TD 824 文献标识码：A Analysis of instability and failure mode and stability of an open-pit mine slope HUANG Ming-li，GUAN Xiao-ming (School of Civil Engineering，Beijing Jiaotong University，Beijing 100044，China) Abstract:For an open pit slope engineering, describes the work to help and work to help non-landslide slope engineering background and status, combined with the terrain and topography, engineering geology and hydrogeological conditions, analysis of the main factors affecting slope stability and failure mode. The results show that: Continuous rainfall and large-scale open-pit mining is to slide the external factors, unfavorable topography features, the nature of rock and soil of their own poor and weak layer structure is the internal factors, landslide damage along the landslide model performance, round landslide arc, arc - bedding landslides and avalanches four kinds of forms. Use based on the finite element method MIDAS GTS software build three-dimensional geological model of the slope, calculated using a stable strength reduction factor for the stability analysis and evaluation, and the Bishop method of using several engineering properties of soil were less Slope step height parameter optimization analysis. The results showed that: work to help offset the larger sand hill, the top three steps are possible local landslides, stability factor of 1.4125, indicating that the overall slope stability; non-working to help the larger slope of the kaolin layer displacement, landslide surface structure type of kaolin layers, coupled with increased sliding surface heap load weight, stability factor