深部煤层分叉合并区采动应力演化机理及控制技术  

Evolution mechanism and control technology of mining-induced stress in the bifurcation and merging area of deep coal seam

作　　者：张雷[1,2] 李研 屠世浩[1] 屠洪盛[1] 李文龙 ZHANG Lei;LI Yan;TU Shihao;TU Hongsheng;LI Wenlong(School of Mines,China University of Mining and Technology,Xuzhou,Jiangsu221116,China;Xuzhou Coal Mine Group,Xuzhou,Jiangsu221018,China)

机构地区：[1]中国矿业大学矿业工程学院,江苏徐州221116 [2]徐州矿务集团有限公司,江苏徐州221018

出　　处：《采矿与安全工程学报》2022年第4期702-710,共9页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(51874281);国家自然科学基金青年科学基金项目(52004270)。

摘　　要：针对深部煤层分叉合并区工作面前方煤体中应力集中程度增大对煤矿安全开采的威胁,以张双楼煤矿74104工作面为工程背景,综合采用理论分析、数值模拟和现场实测等方法,对工作面进、出合并区域时的采动应力演化机理进行了研究,结果表明:7~#、9~#煤层间距小于等于15 m时,工作面前方煤体应力集中程度明显降低;推入合并区域时,超前支承压力峰值呈先稳定后减小、再小幅增大后保持稳定的趋势;推出合并区域时,超前支承压力峰值呈先稳定后小幅减小、再增大后保持稳定的趋势;模拟分析了在峰值升高区域实施煤层注水软化措施,进、出合并区域时最大峰值分别由56.85、58.41 MPa减小至48.11、48.46 MPa,可有效降低工作面前方煤体中应力集中程度。最终对峰值升高区域采取了煤层注水软化措施,显著降低了垂直应力集中程度,解决了自正常区域向合并区域回采时煤壁片帮等问题,有效保障了74104工作面煤层分叉合并区安全高效生产。For the threat of increasing stress concentration in coal body to safe mining, which is in front of the work face in the bifurcation and merged area of deep coal seam, the evolution mechanism of mining-induced stress was studied by theoretical analysis, numerical simulation and field measurement when the work face enters and exits the merged area in the engineering background of 74104 work face in Zhangshuanglou coal mine. The results show that the stress concentration of coal body in front of the work face is significantly reduced when the distance between 7and 9coal seams is less than or equal to 15 m. When the work face is pushed into the merged area, the peak value of the advance abutment pressure is stable at first, then decreases, and then keeps stable after increasing slightly. When the work face is pushed out of the merged area, the peak value of the advance abutment pressure is stable first, then decreases slightly, and then keeps stable after increasing. The measure of softening coal seam with water injection was simulated and analyzed, and the maximum peak value is reduced from 56.85 and 58.41 MPa to 48.11 and 48.46 MPa respectively when work face enters and exits the merged area. Such measure can effectively reduce the stress concentration in coal body in front of the work face. It was adopted in the peak value rise area, which significantly reduced the vertical stress concentration, solved the problem of coal wall spalling when mining from the normal area to the merged area, and effectively guaranteed the safety and efficiency of production of 74104 work face in the bifurcation and merged area of coal seam.

关 键 词：深部开采 煤层分叉合并区 采动应力演化 数值模拟 煤层注水软化 

分 类 号：TD323[矿业工程—矿井建设]