深部顶板夹煤层巷道变形破坏分析及其控制  

Deformation and failure analysis and control of deep roadway with intercalated coal seam in roof

作　　者：袁越 张峰彬[1] 尚玺 刘兆强 彭刚 YUAN Yue;ZHANG Fengbin;SHANG Xi;LIU Zhaoqiang;PENG Gang(School of Resources,Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan Hunan 411201,China;Key Laboratory of Gas and Roof Disaster Prevention and Control Safety Production,Hunan University of Science and Technology,Xiangtan Hunan 411201,China;Maotian Township People's Government,Xiangxiang Hunan 411406,China)

机构地区：[1]湖南科技大学资源环境与安全工程学院,湖南湘潭411201 [2]湖南科技大学南方煤矿瓦斯与顶板灾害预防控制安全生产重点实验室,湖南湘潭411201 [3]毛田镇人民政府,湖南湘乡411406

出　　处：《中国安全科学学报》2024年第1期158-165,共8页China Safety Science Journal

基　　金：湖南省教育厅优秀青年项目(21B0487);湖南省自然科学基金面上项目资助(2020JJ4305)。

摘　　要：为了探究深部顶板夹煤层软岩巷道大变形破坏问题,以平煤六矿三水平戊二胶带运输巷为工程背景,开展夹煤层巷道围岩破坏分析及控制对策的研究。首先,构建原支护体系组合拱力学模型,推导出直墙半圆拱形巷道稳定判别式;其次,提出“锚网索-梁-注浆-组合砂浆锚索”联合返修控制对策,即沿戊8煤层顶板进行巷道扩刷,采用锚网索、梯子梁完成基本支护,对围岩进行深浅孔注浆加固、顶板及两帮关键部位布置组合砂浆锚索等加强支护,并通过数值模拟分析返修前后应力、位移场分布特征;最后,开展工业性试验,并监测矿压。结果表明:两帮及顶底板最大收敛量分别为93、112 mm,后期变形速率均低于1 mm/d,围岩变形得到有效控制,返修效果良好。Aiming at the problem of large deformation and failure of soft rock roadway in deep coal seam roof,taking the belt transport roadway in No.Wu2 mining area of No.3 horizontal plane in No.6 Mine of Pingdingshan Coal Group as the engineering background,the failure mechanism and control countermeasures of surrounding rock in intercalated coal seam roadway were studied.Firstly,the combined arch mechanical model of the original scheme of belt was constructed,and the stability discriminant of the straight wall semi-circular arch roadway was derived.Secondly,the joint repair technology of"anchor cable-beam-grouting-composite mortar anchor cable"was proposed,that was,the roadway was expanded along the roof of No.Wu8 coal seam,and the basic support of the roadway was completed by anchor cable and ladder beam.The deep and shallow hole grouting of surrounding rock was used for reinforcement support,and the composite mortar anchor cables were arranged at the key parts of the roof and the two sides to strengthen the roadway support.The distribution characteristics of stress and displacement field before and after roadway repair were analyzed by numerical simulation.Finally,the industrial test of the roadway was carried out.The monitoring results of mine pressure show that the maximum convergence of the two sides and the roof and floor are 93 mm and 112 mm respectively,and the deformation rate of the surrounding rock of the roadway is less than 1 mm/d in the later stage.The deformation has been effectively controlled and the repairing effect is good.

关 键 词：顶板 夹煤层 围岩变形破坏 控制方案 软岩巷道 组合拱 

分 类 号：X936[环境科学与工程—安全科学]