动压影响下厚硬石灰岩顶板区段煤柱合理宽度优化及支护技术  

Coal Pillar Width and Support Design of Thick Hard Limestone Roof Section Under Dynamic Pressure

作　　者：石新起 张建忠 李坤 SHI Xinqi;ZHANG Jianzhong;LI Kun

机构地区：[1]山东科技大学能源与矿业工程学院,山东青岛266590 [2]山西东泰鑫源煤业有限公司,山西临汾041083

出　　处：《中国矿山工程》2025年第1期1-7,共7页China Mine Engineering

摘　　要：为了解决厚硬顶板条件下受多次采动影响巷道区段煤柱留设宽度不合理的问题,以东泰鑫源煤矿10109运输顺槽为工程背景,采用理论计算分析、数值模拟和工程实践等方法进行研究。研究结果表明:针对厚硬顶板进行切顶卸压,理论计算得到切顶高度27 m,切顶角度0°;数值模拟结果显示煤柱宽度低于16 m时受两次采动影响后煤柱均存在高应力集中,塑性破坏严重。煤柱宽度高于16 m后,煤柱内弹性核区面积占比大于50%,巷道围岩稳定,结合计算得出受两次动压影响巷道区段煤柱合理留设宽度为16.5 m,提出了以“强帮护顶”为主的支护方案,现场监测一次采动影响下10109运输顺槽顶底板表面最大位移165 mm,两帮表面最大位移118 mm。16.5 m宽度区段煤柱结合联合支护技术可有效控制受动压影响的巷道围岩变形。To address the issue of the excessive width of coal pillars in roadway section affected by multiple mining under the condition of thick hard roof,based on the engineering background of Dongtai Xinyuan Coal Mine 10109 transport channel,theoretical calculation and analysis,Flac3D simulation and engineering practice were adopted to carry out top cutting and pressure relieving for thick hard roof.It is determined that the reasonable remaining width of coal pillar in roadway section affected by two dynamic pressures is 16.5 m.The findings indicate that the cutting height is set at 27 meters with an angle of 0°.The numerical simulation demonstrates that when the coal pillar width is below 16 meters,the coal pillar has high stress concentration and serious plastic failure after being affected by two mining movements.When the width of coal pillar is higher than 16 m,the elastic core area within the coal pillar exceeds 50%,ensuring the stability of the surrounding rock in the roadway.Therefore,a support plan utilizing a“Strengthen the side to protect the top”has been suggested.The maximum surface displacement of the top and bottom plate of 10109 transport trough under the influence of one mining is 165 mm,and the maximum surface displacement of the two sides is 118 mm.The coal pillar in the 16.5 m wide section,along with the combined support technology,can effectively manage the deformation of the roadway's surrounding rock under dynamic pressure.

关 键 词：区段煤柱 切顶卸压 数值模拟 支护技术 采动压力 垂直应力 

分 类 号：TD355[矿业工程—矿井建设]