露井同期开采作用下边坡应力演化机制及其稳定性探究  

Study on Stress Evolution Mechanism and Stability of Slope Under Simultaneous Open-PIT Mining

作　　者：孙世国[1] 宋辉[1] 王佳[1] SUN Shiguo;SONG Hui;WANG Jia(North China University of Technology,Beijing 100144,China)

机构地区：[1]北方工业大学,北京100144

出　　处：《北京工业职业技术学院学报》2022年第4期1-5,共5页Journal of Beijing Polytechnic College

基　　金：中国煤炭科工集团双创资金重点项目(2022-ZD002);国家自然科学基金(41772335)。

摘　　要：露井同期开采影响边坡安全的主要问题是井采区上覆岩体与边坡嵌套在一起,边坡稳定性受露井同时作用,其应力场重新分布,同时下采区开采范围增大,边坡岩体地层分布发生改变,由此导致边坡岩体剧烈变形甚至失稳。以紫金山金铜矿开采实践为例,利用数值模拟方法系统模拟露井同期开采应力场与位移场的演化规律,揭示其滑移机制,建立露井同期开采作用下边坡不同区域地表沉降位移模型,并系统分析叠加变形位移矢量图的分区性及其作用属性;通过精细化方法搜寻出最危险滑移面,并进行其稳定性评价,为类似开采方法的安全设计提供参考依据。The main problem that the synchronous open-pit mining affects the slope safety is that the overlying rock mass and the slope are nested together,the slope stability is affected by the open-pit at the same time,and its stress field is redistributed.Meanwhile,the mining range of the lower mining area is increased,and the slope rock stratum distribution is changed,which leads to severe deformation or even instability of the slope rock mass.Taking the mining practice of Zijinshan gold and copper mine as an example,the evolution law of stress field and displacement field of simultaneous open-pit mining is systematically simulated by using the numerical simulation method to reveal its sliding mechanism,establish the surface settlement displacement model of different areas of slope under the action of simultaneous open-pit mining,and systematically analyze the zoning and action attribute of superimposed deformation displacement vector map.The most dangerous slip surface is found by refined method,and its stability is evaluated,which provides a reference for the safety design of similar mining methods.

关 键 词：同期开采 采动效应 滑移机制 边坡 稳定性 

分 类 号：TD853[矿业工程—金属矿开采]