斜交断层影响下露天煤矿顺倾层状边坡稳定性研究  

Study on dip bedded slope stability of open-pit coal mine under influence of oblique fault

作　　者：王珍 曹兰柱[2] WANG Zhen;CAO Lanzhu(School of Architectural Engineering,Huanghe Science and Technology College,Zhengzhou 450063,China;School of Mining,Liaoning Technical University,Fuxin 123000,China)

机构地区：[1]黄河科技学院建筑工程学院,河南郑州450063 [2]辽宁工程技术大学矿业学院,辽宁阜新123000

出　　处：《煤炭科学技术》2020年第5期69-74,共6页Coal Science and Technology

基　　金：国家自然科学基金资助项目(51874160);河南省高等学校重点科研资助项目(20B560009);河南省科技攻关计划资助项目(202102310567)。

摘　　要：断层对露天矿边坡滑移模式及稳定性的影响极为复杂,为矿山安全生产带来严重威胁;尤其在断层与顺倾弱层共同影响下,会发生滑坡事故。基于现阶段研究成果侧重于断层倾角、厚度、产状、断距等地质特征对边坡稳定性的影响,对于断层与顺倾弱层共同影响下边坡滑移模式及稳定性的研究相对较少。为探究断层形态对顺倾层状边坡滑移模式及稳定性的影响,以元宝山露天矿东帮边坡为工程背景,应用现场调研、理论分析、数值模拟等方法探明了该矿东帮边坡工程地质特征,建立了边坡三维地质模型,并通过改变断层倾角以及断层走向与边坡走向交角2种方式描述断层空间位置,同时基于数值模拟分析结果从边坡滑移模式的角度阐明断层影响下边坡稳定性变化规律。研究结果表明:当断层倾角介于50°~65°时,边坡滑移模式为剪切圆弧-断层-弱层构成的组合破坏,稳定系数随断层倾角增加逐步增大,当断层倾角大于65°时,边坡滑移模式为剪切圆弧-弱层构成的组合破坏,稳定系数不再改变;当走向交角介于30°~70°时,边坡滑移模式为剪切圆弧-断层-弱层构成的组合破坏,稳定系数随走向交角增加而增大,当走向交角大于70°时,边坡滑移模式为剪切圆弧-弱层构成的组合破坏,稳定系数不再发生变化。The influence of the fault on open-pit mine slope sliding mode and stability is very complex,which is serious threat to safe production. Especially in the cases of faults and dip weak layers,it leads a large number of mine landslide accidents. The present research results focus on the influence of geological features such as fault dip,thickness,occurrence and distance on slope stability,but there is relatively little research on slope sliding mode and stability under combine of faults and dip weak layers. In order to research the influence of fault morphology on dip bedded slope sliding mode and stability,this paper takes the eastern slope of Yuanbaoshan open-pit mine as engineering background,applies field investigation,theoretical analysis,numerical simulation and other methods to explore the geological characteristics of eastern slope engineering and establish the three-dimensional geological model,at the same time,describes the spatial location of the fault by changing the dip angle of the fault and the tend angle of the fault and the slope,and clarifies the slope stability changing low with the fault from the perspective of slope sliding mode based on numerical simulation analysis results. The results show that when the fault dip angle is between 50°and 65°,the slope sliding mode is combined destruction of arc,fault and dip weak layer,and the slope stability coefficient increases gradually with the increasing of the fault dip angle,while when the fault angle is greater than 65°,the slope sliding mode is combined destruction of arc and dip weak layer,and the slope stability coefficient is no longer changed. On the other side,when the tend angle is between 30°and 70°,the slope sliding mode is combined destruction of arc,fault and dip weak layer,and the slope stability coefficient increases gradually with the increasing of the fault dip angle,while when the tend angle is greater than 70°,the slope sliding mode is combined destruction of arc and dip weak layer,and the slope stability coefficient is no long

关 键 词：斜交断层 顺倾层状边坡 滑移模式 边坡稳定性 

分 类 号：TD824[矿业工程—煤矿开采] TU457[矿业工程—矿山开采]