摘要
为了降低回采过程中的冲击危险性,以高家堡煤矿104工作面为研究背景,采用数值模拟的方法模拟工作面回采至一次“见方”、二次“见方”期间采场和巷道的应力分布情况。结合104工作面埋深超过千米、煤层和顶板具有冲击倾向性、周围存在断层构造等工程条件,确定了高应力区域,为防冲设计提供了参考依据。结果表明:104工作面回采期间整体静载应力较大,在回采至一次、二次“见方”阶段时煤壁中的应力值最大达到7.93 MPa,应力集中系数达到2.47;从塑性区分布情况来看,在该顶板和采高条件下,裂隙带演化高度约为25 m,地表下沉量较小。分析认为,加强“见方”阶段工作面矿压观测、围岩控制和解危卸压措施,可以大大降低动力事故的危害。
In order to reduce the risk of rock burst during the mining process,taking the No.104 working face of Gaojiabao Coal Mine as the research background,using the numerical simulation method,the stress distribution of the mining face and the roadway during the mining of the working face to the first“square”and secondary“square”was simulated.Combined with the mining conditions and geological conditions of No.104 working face,the high stress areas were determined,which provides reference for the design of rock burst prevention.The results of numerical simulation show that the overall static load stress during the mining of No.104 working face is relatively large,the maximum stress value of the coal wall is 7.93 MPa when the working face is mined to the first and second“square”,the stress concentration coefficient reaches 2.47,and the height of fracture zone is about 25 m.According to the analysis,the harm of dynamic accident can be greatly reduced by strengthening the observation of mine pressure,the control of surrounding rock and the measures of rock burst prevention during the mining face at“square”stage.
作者
李帅
李鹏
朱昊
孔宪伟
LI Shuai;LI Peng;ZHU Hao;KONG Xian-wei(Shaanxi Zhengtong Coal Industry Co.,Ltd.,Xianyang 712000,China)
出处
《陕西煤炭》
2020年第1期32-36,58,共6页
Shaanxi Coal
关键词
采动应力
应力分布
数值模拟
防冲设计
mining stress
stress distribution
numerical simulation
design of rock burst prevention
