露天转地下开采方案优化及边坡稳定性分析  

Mining Scheme Optimization and Slope Stability Analysis for Transition from Open-Pit to Underground Mining

作　　者：刘杰[1] 赵兴东[1] 路增祥 

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819 [2]罕王傲牛矿业股份有限公司,辽宁抚顺113001

出　　处：《东北大学学报（自然科学版）》2013年第9期1327-1329,1334,共4页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(51174044);国家自然科学青年基金资助项目(51004025);辽宁省教育厅人才项目(LJQ2012024);国家高技术研究发展计划项目(2011AA060400);深部岩土力学与地下工程国家重点实验室开放基金资助项目(SKLGDUEK1113)

摘　　要：以孟家堡铁矿露天转地下开采的实际情况为工程背景,利用强度折减法和FLAC3D数值模拟方法,以塑性区贯通、计算不收敛及位移突变为失稳判据计算边坡安全系数,确定潜在滑移面,分析静态及开采扰动下的边坡稳定性;根据随采深下降的边坡破坏规律,对开采方案进行优化.分析结果表明,无开采扰动下边坡安全系数为1.94,满足稳定性要求;不留境界矿柱的无底柱分段崩落法地下回采过程中,覆盖层厚度要达到25 m,其起到吸收并转移应力和减缓边坡能量耗散速度的作用.Taking the transition from open-pit to underground mining of Mengjiabao iron mine as engineering background according to the plastic zone connection,computation divergence and displacement discontinuity as instable criterion of landslide,the strength reduction method and FLAC3Dw ere used to calculate slope safety factor,determine potential slip surface of the slope and analyze slope stability under the condition of static and dynamic underground mining disturbance.Depending on the slope failure law under the different mining depth,the mining scheme w as optimized.The results show n that the slope safety factor w ithout the mining disturbance is 1.94,meeting stability requirement.In process of underground mining using non-floor pillar sublevel caving stoping,the thickness of covering layer must reach up to 25 m.It plays an important role in absorbing stress,transferring stress and slow ing the energy dissipation speed.

关 键 词：露天转地下开采 边坡稳定性 强度折减法 安全系数 FLAC3D 

分 类 号：TD824[矿业工程—煤矿开采]