露天地下联合开采保安矿柱充填置换设计与数值模拟  

Design and Numerical Simulation of Safety Raw Pillar Replace with Backfill Body in Open-pit and Underground Combined Mining

作　　者：张建刚[1,2,3] 王少勇[1,2] 吴爱祥[1] 韩斌[1] 尹升华[1] 

机构地区：[1]北京科技大学土木与环境工程学院 [2]煤炭资源与安全开采国家重点实验室(中国矿业大学) [3]贵州锦丰矿业有限公司

出　　处：《现代矿业》2013年第12期1-5,共5页Modern Mining

基　　金：国家自然科学基金项目(编号:50934002;51104011;51304011);国家"十二五"科技支撑计划项目(编号:2012BAB08B02);中国矿业大学煤炭资源与安全开采国家重点实验室开放研究基金资助项目(编号:12KF03)

摘　　要：为安全回采露天-地下联合开采的保安矿柱,提出采用充填体置换原生保安矿柱技术。设计了充填体配合比及配筋计算,采用GeoFBA模拟软件对该方案进行了有限元数值模拟,分析了开采置换过程中最大主应力与最大剪应力的变化规律。结果表明:原生保安矿柱通过露天回收并用充填体置换后,充填置换体所受的最大主应力明显减小,仅承受17 kPa的拉应力;且置换后露天坑底部的剪应力立即消失,用废石回填后可消除最大剪应力集中现象;利用充填体置换原生矿柱技术是可行的,项目实施后预计可回收资源37万t,金属量1.55 t。In order to mining the safety pillar of open-pit and underground combined mining, the technology of raw pillar replace with backfill body is put forward. The mixing proportion is designed and reinforcement computation is done, then, the scheme is be finite element numerical simulated by using the GeoFBA software, so as to analysis the law of maximum principal stree and maximum shearing stree in the process of replacement is analyzed in detail. The experimental results show that, the maximum principal stress acted on backfill body after replacement decrease obviously, only 17 kPa. The shearing stress on the bottom of surface disappeared immediately after replacement, and the maximum shearing stress con- centrate phenomenon eliminate when backfilled with barren rock, so, the technology of replace raw pillar with backfill body is a feasible one, there are recyclable resource O. 37 million ton, amount of metal 1.55 ton after the project carried on.

关 键 词：露天-地下联合开采 保安矿柱 充填体 置换 

分 类 号：TD80[矿业工程—矿山开采]