露天延深开采诱发边坡岩体滑移机理分析  

Mechanism of slope rock slip induced by extended deep mining of open pit

作　　者：孙世国 高园园 于云鹤 刘汭琳 SUN Shiguo;GAO Yuanyuan;YU Yunhe;LIU Ruilin(College of Civil Engineering,North China University of Technology,Beijing 100144,China;AVIC Construction Group,Beijing 100144,China)

机构地区：[1]北方工业大学土木工程学院,北京100144 [2]中航建设集团,北京100144

出　　处：《陕西煤炭》2024年第11期81-86,共6页Shaanxi Coal

基　　金：组织科研(2023YZKY01);国家自然基金课题(41772335)。

摘　　要：在充分考虑地下采区多次重复采动的基础上对东露天矿的延深开采进行数值模拟计算,分析数值模拟结果,研究井工转露天开采诱发边坡滑移机制,分析井工开采对露天边坡的影响,并通过计算沉降与位移,分析可知,地下采区受露天矿开采诱发的活化影响对边坡的稳定性影响增大;由于活化效应,坑底矢量方向基本指向地下采空区方向,上部不同区域合成后矢量指向不同,说明放顶煤开采地下采空区的空间受连续活化影响,空隙空间逐渐减小,剩余空间继续压密;随着边坡的不断开采,当边坡位于主断面下山方向一侧时,矢量合成后应力作用增大,对边坡的稳定性产生不利影响;而当边坡位于主断面上山方向一侧时,二者矢量合成后,会有一部分应力相互抵消,这对边坡的稳定性是有利的。On the basis of the repeated mining in the underground mining area,we analyze the numerical simulation results of extended deep mining of the east open pit,study the mechanism of slope slip induced by shaft-transferred open pit mining,analyze the influence of shaft mining on open pit slope,and calculate the settlement and displacement.The results show:The influence of the activation induced by open pit mining on the stability of the slope increases.Due to the activation effect,the pit bottom vector direction basically points to the underground goaf direction,integrated vector points differently in different regions in the upper part,indicating that the space of underground goaf for top coal mining is affected by continuous activation,the void space gradually decreases,the remaining space continues to press tight.With the continuous mining of the slope,when the slope is located on the descending direction side of the main section,the stress effect increases after the vector synthesis,which adversely affects the stability of the slope;when the slope is located on the uphill direction side of the main section,after the synthesis of both vectors,some of the stresses will offset each other,which is beneficial for the slope stability.

关 键 词：露天延深开采 数值模拟 滑移机理 多次重复采动 边坡稳定性 活化效应 

分 类 号：TD804[矿业工程—矿山开采]