厚坚硬顶板工作面覆岩运动规律与采动应力分布研究  

Study on Movement Law and Mining Stress Distribution of Overlying Rock in Working Face with Thick and Hard Roof

作　　者：侯晓松 梁超 刘士磊 牛世伟 HOU Xiaosong;LIANG Chao;LIU Shilei;NIU Shiwei(Tianchen Coal Mine,Zaozhuang Mining(Group)Co.,Ltd.,Zaozhuang 370400,China;Zaozhuang Energy Bureau,Zaozhuang 277020,China;College of Energy and Mining Engineering,Shandong University of Science and Technology,Qingdao 266590,China)

机构地区：[1]枣庄矿业(集团)有限责任公司田陈煤矿,山东枣庄370400 [2]枣庄市能源局,山东枣庄277020 [3]山东科技大学能源与矿业工程学院,山东青岛266590

出　　处：《煤》2023年第12期15-19,共5页Coal

摘　　要：基于采空区上方坚硬厚层砂岩顶板容易聚积大量的弹性能,在顶板结构受到破坏时造成冲击地压的问题,以田陈煤矿3_(下)7115工作面为工程背景,通过理论分析和现场监测对厚坚硬顶板工作面覆岩运动规律及采动应力分布特征进行了研究。首先通过理论计算得到3_(下)煤层工作面上覆厚层砾岩层在弹性基础上的极限破断步距约为43.5 m;其次根据现场微震监测数据分析得出支承压力对底板破断的深度约为60 m,采动应力在垂直方向约为煤层上方40 m,下方60 m左右范围内;最后根据钻孔应与钻屑法监测数据分析出侧向支承压力峰值位于煤壁深处8~9 m.研究结果可为矿井防冲技术体系的建立提供重要指导意义,同时能够为相似坚硬顶板矿井矿压研究提供借鉴和帮助。Based on the problem that the hard thick sandstone roof above the goaf is easy to accumulate a large amount of elastic energy,which will cause rock burst when the roof structure is damaged,taking the No.7115 working face under No.3 Tianchen Coal Mine as the engineering background,the overburden movement law and mining stress distribution characteristics of the thick hard roof working face are studied through theoretical analysis and on-site monitoring.First of all,through theoretical calculation,it is obtained that the limit breaking step of thick conglomerate overlying the working face of No.3 coal seam on the elastic basis is about 43.5 m.Secondly,according to the analysis of on-site microseismic monitoring data,it is concluded that the breaking depth of the support pressure to the bottom plate is about 60 m,and the mining stress in the vertical direction is about 40 m above the coal seam and about 60 m below it.Finally,according to the monitoring data of borehole stress and drilling cuttings method,it is analyzed that the peak value of lateral abutment pressure is 8~9 m deep in the coal wall.The research results can provide an important guiding significance for the establishment of mine scour prevention technology system,and can also provide reference and help for the study of ground pressure in similar hard roof mines.

关 键 词：坚硬顶板 冲击地压 覆岩运动 采动应力 

分 类 号：TD325[矿业工程—矿井建设]