摘要
以冬瓜山铜矿井下900 m深处的出矿巷道作为研究对象,基于"隔一采一充一"阶段凿岩、分段崩落的回采方案,利用FLAC3D数值模拟软件研究了静动态开挖过程中出矿巷道围岩的变形特征。模拟相关岩体力学参数由三轴压缩及频繁冲击扰动试验数据折减获得,采用Mohr-Coulomb模型进行静态开挖分析,结合Strain-Softening模型进行动态扰动影响模拟分析。研究结果表明:爆破产生的扰动促使围岩变形加剧,但不会改变静态开挖时围岩变形演化的规律;开挖时巷道周边产生应力卸荷现象,且顶板出现拉应力,靠近采场巷道两帮应力离散性大,造成顶板易产生拉伸破坏,靠近采场巷道两帮易发生片帮;结合深部出矿巷道实际稳定情况,推测巷道顶板及靠近采场部位易产生破坏,需加强支护,其余部位稳定性相对较好。
When deep rock mass is in a complex geological and mechanical environment,factors such as high stress and blasting disturbance usually affect the stability of surrounding rock in deep roadway directly. At present,the research analysis to deformation characteristics of surrounding rock in deep mine roadway is still inadequate,especially the actual destruction of roadway surrounding rock. So it is significant to study deformation characteristics of surrounding rock under dynamic disturbance,which can provide theoretical reference for supporting deep roadway surrounding rock.Through the investigation and analysis of engineering geological conditions of Dongguashan copper mine and occurrence conditions of No.Ⅰ orebody,the study on deformation regularity of roadway surrounding rock under static and dynamic load was conducted,and the numerical model is established according to the mining scheme. Therefore,taking the mine roadway of Dongguashan copper mine in the downhole 900 m deep as the research object,FLAC3D numerical simulation software was used to analyze the deformation characteristics of surrounding rock in the mining roadway,which based on the stopping scheme of the stage drilling block caving about“one charge one by one”.At first,the static and dynamic mechanical parameters of marble,skarn,serpentine,siltstone were measured through the indoor rock mechanics test,then the static and dynamic parameters of rock mass were obtained based on the generalized hoek-brown criterion. That is also to say,the simulated mechanical parameters of rock mass were obtained by reduced triaxial compression and frequent impact perturbation test data.After the establishment of the numerical calculation model,the Mohr-Coulomb model was used for static excavation analysis,and the dynamic disturbance impact simulation analysis was carried out with the Strain-Softening model,both of them were used to analyze the stress evolution and displacement evolution in roof and floor of roadway as well as both sides of surrounding rock.At la
作者
王春
王成
熊祖强
程露萍
王怀彬
WANG Chun;WANG Cheng;XIONG Zuqiang;CHENG Luping;WANG Huaibin(School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,Henan,China;School of Resources and Safety Engineering,Central South University,Changsha 410083,Hunan,China;The Collaborative Innovation Center of Coal Safety Production of Henan,Jiaozuo 454000,Henan,China)
出处
《黄金科学技术》
CSCD
2019年第2期232-240,共9页
Gold Science and Technology
基金
河南省高校重点科研项目"地热新能源合理开采涉及的气-水-岩三态平衡机制研究"(编号:18A440014)
河南理工大学博士基金项目"高静载高温状态下深部岩石动力学特性研究"(编号:672707)
河南省重点研发与推广专项(科技攻关)项目"气液自行循环开采高温岩体地热能技术研究"(编号:192102310247)
深井瓦斯抽采与围岩控制技术国家地方联合工程实验室开放研究基金项目"高静载卸荷过程中受冲击小扰动时煤岩的破坏机理"(编号:SJF201803)联合资助
关键词
深部开采
动力扰动
采矿方案
数值模拟
出矿巷道
变形特征
deep mining
dynamic disturbance
mining method
numerical simulation
ore-drawing roadway
deformation characteristics
