急倾斜特厚煤层防冲开采方法数值模拟研究  

Numerical simulation study on mining method for anti rock burst in different steeply inclined extra-thick coal seam

作　　者：陈泽民 李振雷 钟涛平 宋大钊 刘旭东 胡旭聪 CHEN Zemin;LI Zhenlei;ZHONG Taoping;SONG Dazhao;LIU Xudong;HU Xucong(School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China;CHN Energy Group Xinjiang Energy Co.,Ltd.,Urumqi 830027,China)

机构地区：[1]北京科技大学土木与资源工程学院,北京100083 [2]国家能源集团新疆能源有限责任公司,新疆乌鲁木齐830027

出　　处：《煤矿安全》2025年第1期117-127,共11页Safety in Coal Mines

基　　金：国家自然科学基金资助项目(52374180)。

摘　　要：以某急倾斜特厚煤层矿井南采区B_(1+2)、B_(3-6)煤层开采为工程背景,结合理论分析、数值模拟手段,对比研究了急倾斜煤层水平分段开采和倾斜分段开采对冲击地压防治的作用。结果表明:同水平B_(3-6)煤层开采前,水平分段开采应力集中区主要位于巷道上下方围岩以及采空区下方煤体,倾斜分段开采应力集中区转移至低水平侧的采空区下方尖角区域煤体以及低水平侧巷道上下方围岩;相较于水平分段开采,倾斜分段开采高水平侧巷道上下方围岩应力峰值降低了10~20 MPa,应力集中巷道从4条减少为2条;同水平先采B_(3-6)煤层可弱化水平应力传递,对后采的B_(1+2)煤层具有卸压保护作用。此外,在倾斜分段开采条件下,倾斜采空区可进一步弱化水平应力传递,对高水平侧巷道具有卸压保护作用;基于综合对比,顺向倾斜分段开采的巷道上下方围岩应力水平更低,巷道变形程度最低,更利于冲击地压防治。This study takes the mining of B_(1+2) and B_(3-6) coal seams in the southern mining area of a steep and thick coal seam mine as the engineering background,and combines theoretical analysis and numerical simulation methods to compare and study the effects of horizontal and inclined segmented mining of steep and thick coal seams on the prevention and control of rock burst.The results show that:before mining the B_(3-6) seam at the same level,the stress concentration area of horizontal sectional mining is mainly located in the surrounding rock above and below the roadway and the coal body below the gob,while the stress concentration area of inclined sectional mining is shifted to the coal body at the sharp corner area below the gob and the surrounding rock above and below the roadway at the low level side;compared with horizontal sectional mining,the peak stress in the surrounding rock above and below the high level side roadway of inclined sectional mining is reduced by 10-20 MPa,and the stress concentration roadway is reduced from 4 to 2;mining the B_(3-6) coal seam first at the same level can weaken the horizontal stress transfer,and it has the function of pressure relief protection for the B_(1+2) coal seam mined later.In addition,under the condition of inclined sectional mining,the inclined gob can further weaken the horizontal stress transfer,and it has the function of pressure relief protection for the high level side roadway;based on comprehensive comparison,it is believed that the stress level of the surrounding rock above and below the roadway is lower and the degree of deformation of the roadway is the lowest,which is more conducive to the prevention and control of rock burst.

关 键 词：急倾斜煤层 冲击地压 防冲开采方法 数值模拟 应力集中 弱化应力传递 

分 类 号：TD324[矿业工程—矿井建设]