精品文档---下载后可任意编辑黄明利,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-顺层滑坡和倒塌 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,采纳强度折减法计算了稳定系数,进行了稳定性分析和评价,并采纳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较大,上部 3 个台阶均可能发生局部滑坡,稳定系数为 1.4125,表明边坡整体保持稳定;非工作帮坡脚的高岭土层位移较大,滑坡结构面类型为高岭土层,加之地表重物堆载加剧滑动,稳定系数为 0.8625,表明边坡已经发生失稳破坏。泥岩1 和泥岩 2 在开挖高度为 6 米时可基本保持稳定;而砂土和粘性土层建议在低于 6 米台阶高的情况下进行开挖;粉砂岩 1 在台阶高为 8 米时都将保持稳定。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 Study Analysison ofinstability and failure modeand stability of an open-pit mineslope and sensitivityof rock mass parameters HUANGMing-li,GUAN Xiao-ming(School of Civil Engineering, ,Beijing Jiaotong University,,Beijing100044,,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 facto...