孤岛工作面覆岩结构演化及区段煤柱稳定性  

Evolution of overburden structure and stability of coal pillars in isolated island working face

作　　者：王虹玉 程志恒 王朋 陈亮[3] 曲晓明 郭凯 WANG Hongyu;CHENG Zhiheng;WANG Peng;CHEN Liang;QU Xiaoming;GUO Kai(School of Emergency Management and Safety Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;School of Grammar and Law,North China Institute of Science and Technology,Langfang Hebei 065201,China;School of Mine Safety,North China Institute of Science and Technology,Langfang Hebei 065201,China;China Coal Science and Technology Group Shenyang Research Institute Co.,Ltd.,Shenyang Liaoning 113122,China;School of Civil and Resources Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]中国矿业大学(北京)应急管理与安全工程学院,北京100083 [2]华北科技学院文法学院,河北廊坊065201 [3]华北科技学院矿山安全学院,河北廊坊065201 [4]中煤科工集团沈阳研究院有限公司,辽宁沈阳113122 [5]北京科技大学土木与资源工程学院,北京100083

出　　处：《中国安全科学学报》2024年第11期108-118,共11页China Safety Science Journal

基　　金：国家自然科学基金面上项目资助(52074120);国家自然科学基金青年基金资助(52204133,52104131)。

摘　　要：为探究浅埋煤层孤岛工作面开采时覆岩结构演化及区段煤柱稳定性,以泰华煤矿50104工作面为工程背景,采用理论分析、数值模拟、现场实测相结合的研究手段,分析其两侧区段煤柱承载能力及区段煤柱覆岩结构演化特征;并利用FLAC 3D数值软件,模拟塑性区分布情况以及采动应力演化特征。结果表明:50104工作面推进过程中,东西两侧区段煤柱塑性破坏滞后于工作面推进过程,位于工作面后方采空区处的区段煤柱处于塑性破坏状态,而位于工作面煤壁前方的煤柱存在稳定的弹性区,整体保持稳定,且两侧区段煤柱应力分布呈现相同特征,2条11 m煤柱高应力集中区域保持对称,均位于工作面后方;工作面区段煤柱高应力破坏区域发展速度滞后于工作面推进速度,工作面前方区段煤柱中心区域平均应力值从3.35 MPa增加至3.54 MPa,但始终未超过理论计算得到的煤柱承载强度值;通过分析50104工作面的矿压监测数据,得出实测初撑力均值为3932.4 kN,占液压支架额定初撑力的55%;平均最大工作阻力5812.3kN,占额定工作阻力的61.2%;加权平均阻力均值为4836.6kN/架,占额定工作阻力的50.9%;最大来压6013 kN,支架应力约2.35 MPa,证明11 m煤柱稳定,位于工作面煤壁前方区段煤柱的整体稳定性较好。To investigate the evolution of overburden structure and the stability of district coal pillars during the mining of shallow-buried coal seam island faces,a study was conducted with the 50104 working face of Taihua coal mine as the engineering background.The research employed a combination of theoretical analysis,numerical simulation,and on-site measurement to analyze the load-bearing capacity of the district coal pillars and the characteristics of overburden structure evolution on both sides.The FLAC 3D numerical software was utilized to simulate the distribution of plastic zones and the evolution of mining-induced stress.The results indicate that during the advancement of the 50104 working face,the plastic destruction of the district coal pillars on both sides lagged behind the progress of the working face.The district coal pillars located in the goaf area behind the working face were in a state of plastic destruction,while those in front of the working face coal wall maintained a stable elastic zone,overall remaining stable.Throughout the working face advancement,the stress distribution of the district coal pillars on both sides exhibited the same characteristics,with two 11 m coal pillars showing symmetric high-stress concentration areas,both located behind the working face.The development speed of the high-stress destruction area of the district coal pillars lagged behind the advancement speed of the working face.The average stress value in the central area of the district coal pillars in front of the working face increased from 3.35 MPa to 3.54 MPa,but it never exceeded the coal pillar bearing capacity value calculated theoretically.Analysis of the mine pressure monitoring data from the 50104 working face revealed that the average initial support force was 3932.4 kN,accounting for 55%of the rated initial support force of hydraulic support.The average maximum working resistance was 5812.3 kN,representing 61.2%of the rated working resistance.The weighted average resistance was 4836.6 kN per support,which is 5

关 键 词：孤岛工作面 覆岩结构 区段煤柱 浅埋煤层 煤柱稳定性 数值模拟 

分 类 号：X936[环境科学与工程—安全科学]