露天矿边坡稳定性的断面形态效应研究  

Study of section shape effect on stability of open-pit slope

作　　者：王东 张禹 曹兰柱 贺希格图 周玉祥 WANG Dong1, ZHANG Yu1, CAO Lanzhu1, HE Xigetu2, ZHOU Yuxiang1(1 College of Mines, Liaoning Technical University, Fuxin Liaoning 123000, China; 2 Inner Mongolia Huolinhe Opencast Coal Industry Co., Ltd, Tongliao Inner Mongolia 028000, Chin)

机构地区：[1]辽宁工程技术大学矿业学院 [2]内蒙古霍林河露天煤业有限公司

出　　处：《中国安全科学学报》2018年第1期105-111,共7页China Safety Science Journal

基　　金：国家自然科学基金重点项目资助(U1361211);国家自然科学基金资助(51474119,51104084);辽宁省煤炭资源安全开采与洁净利用工程研究中心开放基金资助(LNTU15KF08)

摘　　要：为探究非线性坡面对边坡安全的影响,基于简化Bishop法理论,分析条块自重作用在滑面不同位置时产生的下滑力与抗滑力的数值关系,进而研究坡面形态对稳定性的影响,据此提出边坡的断面形态效应概念;以黑山露天矿边坡为例,通过简化Bishop法与基于强度折减法的数值模拟分别评估原设计坡面与不同外凸度的非线性坡面边坡的稳定性。结果表明：底面倾角αi均存在一个特定的值θ使既定滑面分为抗滑与利滑的2部分;当断面形态差异主要分布在抗滑滑面上时,产生的断面形态效应有利于边坡稳定,反之则反;就露天矿边坡而言,合理的外凸坡面产生的形态效应有利于边坡稳定,其在减少剥离成本上有显著的优势。In order to explore the effects of nonlinear slopes on slope safety,based on the simplified Bishop theory,the relationship of the values between the sliding force and the anti-slip force generated by the slice＇s weight on different positions of sliding surface is studied for each slice. Further,effects of the section morphology on slope stability was examined and a concept of section shape effect of slope is introduced. Taking the west slope of the Heishan opencast mine as an example,its stability as a function of the section shape is calculated by simplified Bishop method and numerical simulation with strength reduction method. The results indicate that the bottom angle αihas always a definite value θ dividing a given slip plane into two parts,anti-skid and slip,that when the shape discrepancy is mainly distributed on the anti-slip surface,the shape effect is favorable to the slope stability,and vice versa,that for open pit slopes,the section shape effect caused by the reasonable convex slope is not only conducive to the stability of the slope,but also reduces the cost of stripping significantly.

关 键 词：坡面形态 边坡稳定性 露天矿 简化BISHOP法 强度折减法 

分 类 号：X928.03[环境科学与工程—安全科学]