伊敏露天矿弱层与正断层复合作用下顺倾边坡变形规律  

Deformation law of slope under the compound action of weak layer and positive fault of Yimin Open-pit Mine

作　　者：王振伟 李斌 王智涛 董黎明 韦永豪 李营作 WANG Zhenwei;LI Bin;WANG Zhitao;DONG Liming;WEI Yonghao;LI Yingzuo(School of Civil Engineering,North China University of Technology,Beijing 100144,China;Huaneng Yimin Coal and Electricity Co.,Ltd.,Hulunbei'er 021134,China)

机构地区：[1]北方工业大学土木工程学院,北京100144 [2]华能伊敏煤电有限责任公司,内蒙古呼伦贝尔021134

出　　处：《露天采矿技术》2022年第5期24-27,共4页Opencast Mining Technology

基　　金：国家自然科学基金面上资助项目(51774184);北方工业大学毓优团队资助项目(107051360019XN134/017);北方工业大学科研启动基金资助项目(110051360002)。

摘　　要：为探究某露天矿断层与弱层复合作用下边坡稳定性问题,结合工程实际,通过改变弱层位置、厚度、倾角等参数,应用FLAC^(3D)程序探究其变形破坏模式及稳定性变化规律,阐明边坡破坏机理,并提出相应的灾害防控技术措施。结果表明:弱层与断层的相对空间位置关系、弱层性质是该类边坡灾变演化的主要控制因素;二者相交时,因弱层连续性被破坏且坡角岩体强度增大等因素,边坡稳定性有所提升,此时正断层对滑坡有抑滑作用;当弱层厚度增加,强度降低时,边坡稳定性呈逐渐降低趋势,直至破坏;当弱层倾角变大,边坡稳定性逐渐降低,最大位移量随上部覆岩荷载减小而减小。In order to explore the slope stability under the combined action of fault and weak layer in an open-pit mine,combined with the actual project,by changing the parameters such as the position,thickness and inclination of weak layer,this article applies FLAC^(3D) program to explore its deformation and failure mode and stability change law,expounds the slope failure mechanism,and puts forward the corresponding technical measures for disaster prevention and control.The results show that the relative spatial relationship between weak layers and faults and the properties of weak layers are the main controlling factors for the catastrophic evolution of this kind of slope.When the two intersect,the slope stability is improved due to the destruction of weak layer continuity and the increase of slope angle rock strength.At this time,the normal fault can inhibit the landslide;when the thickness of weak layer increases and the strength decreases,the slope stability decreases gradually until failure;when the dip angle of the weak layer increases,the slope stability decreases gradually,and the maximum displacement decreases with the decrease of the upper overburden load.

关 键 词：边坡稳定性 正断层 灾害防控 软弱岩层 破坏模式 

分 类 号：TD824.7[矿业工程—煤矿开采]