特厚煤层综放开采下工作面底板岩层破坏特征  

Study on the failure characteristics of the bottom slate layer in the working face of fully mechanized caving in ultra-thick coal seam

作　　者：高银贵 孔皖军 陈永春 薛贤明 郑刘根[3] 常成林 姜春露[3] 国伟 雷锋 王刚 GAO Yingui;KONG Wanjun;CHEN Yongchun;XUE Xianming;ZHENG Liugen;CHANG Chenglin;JIANG Chunlu;GUO Wei;LEI Feng;WANG Gang(Ordos Huaxing Energy Co.,Ltd.,Ordos 017000,China;Ping′an Mining Engineering Technology Research Institute Co.,Ltd.,Huainan 232001,China;School of Resource and Environment Remediation,Anhui University,Hefei 230601,China)

机构地区：[1]鄂尔多斯市华兴能源有限责任公司,内蒙古鄂尔多斯017000 [2]平安煤炭开采工程技术研究院有限责任公司,安徽淮南232001 [3]安徽大学资源与环境工程学院,安徽合肥230601

出　　处：《能源环境保护》2021年第6期68-75,共8页Energy Environmental Protection

摘　　要：为提高特厚煤层工作面综放开采条件下煤层底板突水预警有效性,以唐家会矿61303工作面为研究区,通过光纤传感技术和高密度并行电法勘探技术,进行井下钻孔布置与实测,观测6煤采后底板变形和破坏情况。根据观测孔光纤应变云图变化,在工作面未到达监测断面孔口位置时,底板受采动超前应力影响前期以压应变为主;当工作面推过监测钻孔,由于底板卸压发生底鼓膨胀受剪切力的作用,呈现一定拉伸应变。结合视电阻率的变化分析了底板破碎发育情况及其控制层位,61303工作面底板岩层破坏深度为14.5 m,位于砂泥岩岩层中部,破坏扰动最大深度为32.0 m,位于砂泥岩岩层下部。In order to improve the effectiveness of early warning technology of water inrush from the coal seam floor in the working face of fully mechanized caving in ultra-thick coal seams,selecting No.61303 working face of Tangjiahui Mine as the research area,the underground drilling layout and actual measurement were carried out,using the optical fiber sensing technology and high-density parallel electrical exploration technology,to observe the floor deformation and destruction of the 6 th coal after mining.According to the change of the optical fiber strain nephogram of the observation hole,when the working face does not reach the orifice position of the monitoring section,the bottom plate is mainly affected by the mining advance stress in the early stage.When the working face pushes through the monitoring borehole,due to the bottom bulge expansion caused by the bottom plate pressure relief and the shear force,it presents a certain tensile strain.Combined with the change of apparent resistivity,the development of bottom plate crushing and its control horizon were analyzed.The depth of the failure zone of the floor rock stratum of No.61303 working face is 14.5 m,which is located in the middle of the sandstone mudstone layer.The maximum depth of failure disturbance is 32.0 m,which is located in the lower part of sandstone mudstone layer.

关 键 词：准格尔煤田 特厚煤层 底板破坏 分布式光纤 并行电法 

分 类 号：X936[环境科学与工程—安全科学]