某矿尾砂胶结充填体强度演化特征及力学效应研究  

Study on Strength Evolution Characteristics and Mechanical Effect of Cemented Tailings Backfill in a Mine

作　　者：苗磊刚[1,2,3] 牛园园 潘泱波 MIAO Leigang;NIU Yuanyuan;PAN Yangbo(School of Construction Management,Jiangsu Vocational Institute of Architectural Technology,Xuzhou 221116,China;School of Safety Science and Engineering,Anhui University of Science and Technology.Huainan 232001,China;Ping′an Coal Mining Engineering Technology Research Institute,Huainan Mining(Group)Co.,Ltd.,Huainan 232001,China;College of Rail Transit,Jiangsu Province Xuzhou Technician Institute,Xuzhou 221000,China)

机构地区：[1]江苏建筑职业技术学院建筑管理学院,江苏徐州221116 [2]安徽理工大学安全科学与工程学院,安徽淮南232001 [3]淮南矿业(集团)有限责任公司平安煤炭开采工程技术研究院,安徽淮南232001 [4]江苏省徐州技师学院轨道交通学院,江苏徐州221000

出　　处：《金属矿山》2023年第3期52-58,共7页Metal Mine

基　　金：国家自然科学基金项目(编号:51474010);江苏省高等学校自然科学研究项目(编号:19KJB130004);江苏省高校“青蓝工程”项目(编号:2019);淮南矿业(集团)有限责任公司博士后项目(编号:307556)。

摘　　要：以某金属矿山充填开采为研究背景,开展了不同配比参数下的充填体抗压、抗拉强度试验,分析了不同配比参数下的充填体强度演化特征。同时,采用FLAC3D数值模拟软件分析了矿体回采及采空区充填过程中的充填体及围岩受力特征,讨论了充填体在采场内的力学效应。研究表明:随着养护时间增加,充填体的力学强度呈不断增加的趋势,并且浓度或灰砂比越高的充填体其抗压强度增长的幅度也越大;在养护早期,水泥含量减小对尾砂胶结充填体强度的影响并不显著;矿体回采后,采场顶板及底板出现了压应力集中的特征,但采空区充填后围岩的应力集中状态得到了明显改善;此外,在二步骤采空区充填后,充填体拉应力达到了0.20 MPa,超过了部分充填体的抗拉强度,因此建议充填体的灰砂比最低应为1∶6,以维持充填体在采场的稳定。Taking filling mining of a metal mine as the study background,the compressive and tensile strength tests of backfill body under different proportion parameters were carried out,and the strength evolution characteristics of backfill under different proportion parameters were analyzed.Meanwhile,FLAC3D numerical simulation software was used to analyze the mechanical characteristics of filling body and surrounding rock in the process of orebody mining and goaf filling,revealing the mechanical effect of filling body in the stope.The results show that with the increase of curing time,the mechanical strength of backfill tends to increase continuously,and the compressive strength of backfill with higher concentration or cement-sand ratio increases more.At the early curing stage,the influence of cement content reduction on the strength of cemented tailings backfill is not significant.After orebody mining,the roof and floor of stope show the characteristics of compressive stress concentration,but the stress concentration of surrounding rock is obviously improved after goaf filling.In addition,after the second-step goaf filling,the tensile stress value of the filling body reaches 0.20 MPa,which exceeds the tensile strength of some backfill.Therefore,it is recommended that the lowest ratio of cement to sand of the backfill should be 1∶6 to maintain the stability of the backfill in the stope.

关 键 词：充填体 数值模拟 强度特性 单轴压缩 

分 类 号：TD853[矿业工程—金属矿开采]