露天矿多软弱夹层边坡变形机理与形态优化研究  

Study on deformation mechanism and shape optimization ofmulti-weak interlayer slope in open-pit mine

作　　者：田宇 张波 刘博文 王振伟[4] 魏真 闫杰 TIAN Yu;ZHANG Bo;LIU Bowen;WANG Zhenwei;WEI Zhen;YAN Jie(China Coal Xi’an Design Engineering Co.,Ltd.,Xi’an 710054,China;Yimin Open-Pit Mine,Huaneng Yimin Coal and Electricity Co.,Ltd.,Hulunbuir 021134,China;School of Energy and Mining Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China;North China University of Technology,Beijing 100041,China;Mine Safety Technology Branch,China Coal Research Institute,Beijing 100013,China)

机构地区：[1]中煤西安设计工程有限责任公司,陕西西安710054 [2]华能伊敏煤电有限责任公司伊敏露天矿,内蒙古呼伦贝尔021134 [3]中国矿业大学(北京)能源与矿业学院,北京100083 [4]北方工业大学,北京100041 [5]煤炭科学技术研究院有限公司安全分院,北京100013

出　　处：《煤炭科学技术》2021年第6期189-194,共6页Coal Science and Technology

基　　金：国家自然科学基金面上资助项目(51774184)。

摘　　要：针对露天矿多弱层顺倾到界边坡形态设计问题,结合现场实际情况,通过对地质构造、岩层岩性、软弱夹层赋存情况等工程地质特征进行分析,基于刚体极限平衡理论与数值模拟的手段,研究了含多弱层-断层构造复合顺倾边坡的变形破坏特征、滑坡模式以及不同弱层对边坡稳定性影响程度;采用分段优化方式对到界边坡最终形态进行优化,确保了端帮到界开采过程中煤炭采出的安全高效,为类似边坡工程的滑坡防治提供参考。研究结果表明:露天矿含多弱层-断层构造复合顺倾边坡中,上部岩体含多弱层且岩层风化严重,强度较低,随矿坑深度增加,下部断层带处岩体对上部岩体的约束作用减小,露天煤矿端帮多弱层顺倾边坡的潜在滑坡模式为下部牵引致使沿弱层发生顺层滑动,软弱泥岩是滑坡的主控层,泥岩弱层和断层破碎带的相对位置关系是滑坡的主控因素;当F_(5)断层以上区段坡角为12°,F_(5)断层以下区段坡角为18°,整体坡角为14°时,边坡能够处于稳定状态。Aiming at the slope design problem of the open pit mine of dip final beded slope with weak layer,through the analysis of engi⁃neering geological characteristics such as geological structure,lithology of rock strata and occurrence of weak interbeds,the deformation and failure characteristics,landslide mode and the influence of different weak beds on slope stability are studied by using rigid limit equilibrium theory and numerical simulation.The final shape of the boundary slope is optimized by using the sectional optimization method.It ensures the safety and efficiency of coal resources recovery and maximizes the recovery of coal resources in the process of end-to-end mining,and provides a reference for landslide prevention and control of similar slope projects.The results show that the upper rock mass of open pit slope with multi-weak beds and fault structure has many weak beds and serious weathering and low strength.With the increase of pit depth,the restraint effect of rock mass at the lower fault zone on the upper rock mass decreases.The potential landslide mode of multiweak beds along inclined slope at the end of open pit coal mine is pulled downwards,which leads to bedding sliding along weak beds.Weak mudstone is the dominant layer of landslide,and the relative position relationship between weak mudstone beds and fault fracture zone is the dominant factor of landslide.When the slope angle of the section above Fault F_(5) is 12°and that of the section below Fault F_(5) is 18°,the slope angle of the section below Fault F_(5) is 18°,The overall slope angle is 14°,and the slope can be in a stable state.

关 键 词：露天矿 顺倾边坡 边坡变形 边坡形态 

分 类 号：TD824[矿业工程—煤矿开采]