组合胶结充填体力学特性试验与应用研究  

Experimental research on mechanical properties of combined cemented tailings backfill and its application

作　　者：曹帅[1,2] 薛改利[1,2] 宋卫东 CAO Shuai;XUE Gaili;SONG Weidong(State Key Laboratory of High-Efficient Mining and Safety of Metal Mines of Ministry of Education,Beijing 100083,China;School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京科技大学金属矿山高效开采与安全教育部重点试验室,北京100083 [2]北京科技大学土木与资源工程学院,北京100083

出　　处：《采矿与安全工程学报》2019年第3期601-608,共8页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(51804017);中国博士后基金面上项目(2018M631341);中央高校基本科研业务费项目(FRF-TP-17-075A1);金属矿山教育部重点试验室开放基金项目(USTBMSLAB201804)

摘　　要：为探究组合尾砂胶结充填体力学特性及破坏机制,利用大冶铁矿全尾砂制备灰砂比分别为1∶4,1∶6,1∶8和1∶10的三分层柱状组合胶结充填体试样,借助SANS数显式试验机开展不同配比组合充填体单轴压缩试验。以大冶铁矿为工程背景,借助数值模拟手段优化了充填方案并开展工业试验。研究结果表明:1)组合充填体顶底分层为1∶4时,二分层灰砂比降低,胶结充填体整体强度弱化明显;当二分层配比1∶10时,顶底层灰砂比减小,充填体整体强度逐渐降低,但影响较小。且组合充填体破坏形式主要表现为中部首先发生破坏,顶部和底部伴随拉伸和剪切破坏。2)采空区-171^-159 m灰砂比1∶4,-159^-120 m配比均为1∶8方案最优,同时现场充填体取芯强度较好。将研究成果成功应用于试验采场309矿柱回采,实现了回采率92.14%、贫化率为9.07%的良好技术指标。In order to explore the mechanical properties and failure modes of combined cemented tailings backfill (CTB), the three-layered columnar composite CTB samples with the C/Ts of 1 : 4, 1:6, 1 : 8 and 1:10 respectively are prepared from the tailings from Daye Iron Mine to test the CTB under uniaxial compression, with the aid of SANS digital display equipment. With Daye Iron Mine as engineering background, the filling scheme is optimized by means of numerical simulation and the industrial experiment is carried out. The results have shown that: 1) when the top and bottom stratification of the composite CTB is 1 : 4, the C/T of the second layer of CTB will decrease with the overall strength of the CTB obviously weakened. When the ratio of the second layer is 1 : 10, the C/T of the top layer decreases. The overall strength of the CTB will gradually decrease and the impact is small. Furthermore, the failure mode of the composite CTB is mainly manifested as the first failure in the middle part, then the top and the bottom part destruct with the tensile and shear. 2) The C/T ratio of 1 : 4 in the goaf of -171--159 m and 1 : 8 of -159--120 m is optimal scheme, and the coring strength of on-site filling body is better. The research results have been successfully applied to the pillar 309 in the trial stope, achieving a good technical index of recovery rate of 92.14% and dilution rate of 9.07%.

关 键 词：组合胶结充填体 不同灰砂比 数值模拟 力学特性 试验采场 

分 类 号：TD853[矿业工程—金属矿开采]