浅埋煤层三面临空工作面矿压显现规律研究  

Research on Appearance Law of Underground Pressure in Working Face of Coal Seam with Shallow Burial Depth Facing Goaf on Three Sides

作　　者：王寅 赵斌 王宏伟 WANG Yin;ZHAO Bin;WANG Hongwei(Mine Safety Technology Branch of China Coal Research Institute,Beijing 100013,China)

机构地区：[1]煤炭科学技术研究院有限公司安全分院,北京100013

出　　处：《煤炭技术》2023年第1期1-5,共5页Coal Technology

基　　金：国家重点研发计划资助项目(2017YFC0804205);煤科院技术创新基金Ⅰ类(2020CXⅠ-08);矿山岩层智能控制与绿色开采省部共建国家重点实验室基金(SICGM202106)。

摘　　要：新旺煤矿3104工作面上部为2#煤层房柱式采空区,下部为7#煤层采空区,同煤层紧邻3102采空区,受三面采空区影响工作面安全开采存在隐患。通过FLAC3D数值模拟,并结合现场Pasat-M探测、微震监测及支架阻力实测手段,分析工作面围岩应力分布规律。结果表明:3104工作面煤体中存在多个高波速应力集中区,工作面开采期间,在工作面前方90 m处超前采动影响开始波及到遗留煤柱区域,遗留煤柱处垂直应力开始增加,3#煤层顶部岩层0~20 m出现应力集中,其中3#煤层顶部4~12 m垂直应力集中系数可达2。根据微震监测结果,3104工作面采动形成较大范围采动影响,工作面超前影响范围为200 m,3#煤层上部覆岩160 m及下部150 m出现大量微震事件。The upper part of the 3104 working face of Xinwang coal mine is the room-pillar goaf of the No.2 coal seam,and the lower part is the goaf of the No.7 coal seam.The same coal seam is adjacent to the 3102 goaf.There are hidden dangers for safe mining in the working face affected by the goaf on three sides.Through FLAC3Dnumerical simulation,combined with on-site Pasat-M detection,microseismic monitoring and support resistance measurement methods,the stress distribution law of the surrounding rock of the working face is analyzed.Research shows that there are multiple high-wave velocity stress concentration areas in the coal body of 3104 working face.During mining of the working face,the impact of advanced mining 90 m before the working face begins to spread to the area of the remaining coal pillars,and the vertical stress at the remaining coal pillars begins to increase.Stress concentration appears in the 0-20 m range on the top of No.3 coal seam,and the vertical stress concentration factor can reach 2 in the 4-12 m range on the top of No.3 coal seam.According to the microseismic monitoring results,the mining of the 3104 working face has a large-scale mining influence,and a large number of microseismic events have occurred in the front of the working face200 m,160 m of the upper overburden of the No.3 coal seam and 150 m of the lower part.

关 键 词：三面临空 房柱式开采 Pasat-M探测 微震监测 

分 类 号：TD325[矿业工程—矿井建设] TD323