无煤柱切顶沿空留巷底板破坏规律  

Floor failure law of gob-side entry retaining with roof cutting and non-pillar mining

作　　者：薛卫峰 侯恩科[1] 王苏健 XUE Weifeng;HOU Enke;WANG Sujian(College of Geology and Environment,Xi’an University of Science and Technology,Xi’an 710054,China;Shaanxi Coal and Chemical Industry Technology Research Institute Co.,Ltd.,Xi’an 710065,China;National&Local United Engineering Research Center of Green Safety Efficient Mining,Xi’an 710065 China)

机构地区：[1]西安科技大学地质与环境学院,陕西西安710054 [2]陕西煤业化工技术研究院有限责任公司,陕西西安710065 [3]煤炭绿色安全高效开采国家地方联合工程研究中心,陕西西安710065

出　　处：《西安科技大学学报》2022年第6期1133-1139,共7页Journal of Xi’an University of Science and Technology

基　　金：国家重点研发计划项目(2016YFC0801400);陕西省自然科学基础研究计划-陕煤联合基金项目(2019JLP-01)。

摘　　要：为深入揭示切顶沿空留巷底板破坏发育特征,掌握底板破坏发育规律,以澄合矿区董东煤矿50107工作面为研究对象,利用孔间电阻率成像、钻孔窥视、压水试验等综合探查手段对工作面沿倾向方向及垂直方向底板破坏发育特征与发育规律进行了研究。研究表明:沿倾向方向,切顶侧与未切顶侧底板破坏发育深度在工作面中部为8.0 m,最大破坏发育深度位于巷道两侧各自工作面边缘,分别为9.0 m与9.5 m,破坏发育深度呈现由工作面边缘向中部逐渐变小直至稳定的变化规律;沿垂直方向,自上而下整体裂隙以垂直裂隙为主,在不同岩性间的层间裂隙局部发育,采动裂隙发育至垂深8.7 m处,垂深10.9 m以下石英砂岩中发育边缘光滑、连通性较差的原生裂隙;切顶作用对于底板破坏发育的影响范围包含巷道两侧15 m范围以内,巷道两侧底板破坏发育深度有显著差别,切顶侧采空区底板最大破坏发育深度较未切顶侧有一定降低,减小幅度0.5 m,切顶作用在一定程度降低底板破坏发育深度;巷道两侧底板破坏发育深度不同的根本原因:顶板进行切缝卸压,在一定程度上阻断巷道两侧工作面顶板的应力传递,进而促使巷道及切顶侧工作面适当范围内的采动压力进一步减弱,在此效应的影响下切顶侧顶板垮落较为充分,采空区的重新压实限制底板垂向移动的自由空间,很好地抑制底板破坏深度的进一步发育。In order to deeply reveal the characteristics of floor failure and development of gob-side entry retaining with roof cutting and master the law of floor failure and development,the 50107 working face of Dongdong coal mine in Chenghe mining area is taken as the research object,and the characteristics and law of floor failure and development along the dip direction and vertical direction of the working face are studied by means of comprehensive exploration methods such as inter hole resistivity imaging,borehole peeping,and water pressure test.The research shows that along the dip direction,the development depth of the floor failure at the top cutting side and the non roof cutting side is 8.0 m in the middle of the working face,and the maximum development depth of the floor failure is 9.0 meters and 9.5 meters at the edges of the respective working faces on both sides of the roadway,respectively.Along the vertical direction,the overall fractures from top to bottom are mainly vertical fractures,which are locally developed in the interlayer fractures between different lithology.The mining fractures are developed to a vertical depth of 8.7 meters,and the primary fractures with smooth edges and poor connectivity are developed in quartz sandstone below 10.9 meters.The influence range of roof cutting on floor failure development is within 15 meters on both sides of the roadway.The depth of floor failure development on both sides of the roadway is significantly different.The maximum depth of floor failure development in the goaf at the roof cutting side is lower than that at the non roof cutting side,and with a decrease of 0.5 m,the roof cutting reduces the development depth of floor failure to a certain extent.The basic reason for the different development depth of the floor failure on both sides of the roadway:the roof is cut to relieve pressure,which blocks the stress transmission of the roof of the working faces on both sides of the roadway to a certain extent,thus further reducing the mining pressure within the approp

关 键 词：切顶卸压 沿空留巷 承压水 底板破坏 电阻率成像 

分 类 号：TD12[矿业工程—矿山地质测量]