双临空综放面巷道变形能量时空演化机理及防治技术研究  

Study on Space-Time Evolution Mechanism and Prevention Technology of Roadway Deformation Energy in Fully Mechanized Caving Face Facing Goaf by Double-sides

作　　者：李蒙光 王伸[1,2] 陈祥祺 LI Mengguang;WANG Shen;CHEN Xiangqi(School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo 454003,China;Cooperative Innovation Center of Coal Safety Production and Clean and Efficient Utilization,Jiaozuo 454003,China;Shanxi Anmei Mining Design and Engineering Co.,Ltd.,Taiyuan 030006,China)

机构地区：[1]河南理工大学能源科学与工程学院,河南焦作454003 [2]煤炭安全生产与清洁高效利用省部共建协同创新中心,河南焦作454003 [3]山西安煤矿业设计工程有限公司,太原030006

出　　处：《煤炭技术》2024年第8期37-41,共5页Coal Technology

基　　金：国家自然科学基金青年项目(52204090)。

摘　　要：以塔山矿8204-2特厚煤层综放不规则双临空工作面工程地质条件为背景,基于数值模拟揭示了不同煤柱宽度下采动应力及煤柱应变能密度分布特征。结果表明,双临空工作面回采期间,30~60 m宽的煤柱处于高应力状态,峰值超过25.96 MPa,为原岩应力的2.09倍;当煤柱宽度在30~60 m时,煤柱表现出高应力、高应变能密度的“两高”特点,发生强动压的危险性高。为防止三角变宽煤柱动力失稳,现场成功实践了“超深高密大直径卸压钻孔+补丁锚索加强支护”的强动压治理技术,使得巷道掘进和回采期间均未发生冲击地压及显著动压事故,实现了不规则综放面的安全回采。Taking the engineering geological conditions of 8204-2 ultra-thick coal seam caving with irregular fully mechanized caving face facing goaf by double-sides in Tashan mine as the background,based on numerical simulation,the mining dynamic stress under different coal pillar widths and the distribution characteristics of strain energy density of coal pillar during mining are revealed.The results show that during the mining of face facing goaf by double-sides in extra-thick coal seam,the coal pillar in the range of 30-60 m wide is in a state of high stress,and the peak value exceeds 25.96 MPa,which is 2.09 times of the original rock stress.When the width of the coal pillar is in the range of 30-60 m,the coal pillar shows the"two high"characteristics of high stress and high strain energy density,and the risk of strong dynamic pressure is high.In order to prevent the dynamic instability of the triangular widening coal pillar,the strong dynamic pressure treatment technology of"ultra-deep and high-density large-diameter pressure relief drilling+patch anchor cable reinforcement support"has been successfully implemented on site,so that no rock burst and significant dynamic pressure accidents have occurred during roadway excavation and mining,and safe mining of irregular fully-mechanized caving face has been realized.

关 键 词：特厚煤层 双临空综放工作面 三角煤柱 应变能密度 矿压显现 巷道围岩控制 

分 类 号：TD322.4[矿业工程—矿井建设]