回采煤巷大厚度泥质层状顶板失稳机理及控制对策  

Instability Mechanism and Control Countermeasures of Large Thickness Argillaceous Layered Roof in Mining Roadway

作　　者：赵明洲 方娟 辛程鹏 李回贵 ZHAO Mingzhou;FANG Juan;XIN Chengpeng;LI Huigui(School of Mining Engineering,Guizhou University of Engineering Science,Bijie,Guizhou 551700,China;School of Civil Engineering,Guizhou University of Engineering Science,Bijie,Guizhou 551700,China)

机构地区：[1]贵州工程应用技术学院矿业工程学院,贵州毕节市551700 [2]贵州工程应用技术学院土木建筑工程学院,贵州毕节市551700

出　　处：《矿业研究与开发》2023年第4期75-81,共7页Mining Research and Development

基　　金：贵州省普通高等学校青年科技人才成长项目(黔教合KY字[2020]161);毕节市科学技术项目(毕科联合[2023]33号,毕科联合字G[2019]24号)。

摘　　要：针对具有强度低、层间作用弱、分层厚度小而累计厚度大等属性特征的大厚度泥质层状顶板易变形、难支护特点,以赵庄矿33053回采煤巷为工程背景,根据煤巷工程地质环境、支护方式及顶板失稳特征,构建煤巷顶板岩梁文克尔地基模型并求解出挠度表达式,分析了煤巷顶板岩梁挠曲下沉特征及其关键影响因素,揭示了煤巷大厚度泥质层状顶板的失稳机理。基于锚杆(索)的组合和压缩效应提出了结构与预应力均连续的顶板梁-拱耦合承载结构,阐明了浅部岩层组合压缩承载梁结构与深部岩层压缩承载拱结构的形成机制及二者间的耦合作用机理。现场工程应用结果表明:大厚度泥质层状顶板煤巷采用不同长度预应力锚索配合锚杆支护,在整个使用周期内围岩变形量明显减小、锚杆(索)破断率显著降低,有效确保了煤巷围岩的稳定性。In view of the easy deformation and difficult support characteristics of large thickness argillaceous layered roof with low strength,weak interlayer effect,small layered thickness and large cumulative thickness,taking 33053 stoping coal roadway of Zhaozhuang coal mine as the engineering background,according to the engineering geological environment,support mode and roof instability characteristics of coal roadway,the Winkler foundation model of roof rock beam of coal roadway was constructed and the deflection expression was solved.The flexural subsidence characteristics of roof rock beam of coal roadway and its key influencing factors were analyzed,and the instability mechanism of large thickness argillaceous layered roof of coal roadway was revealed.Based on the combination and compression effect of bolt(cable),a roof beam arch coupling bearing structure with continuous structure and prestress was proposed,and the formation mechanism of the combined compression bearing beam structure in shallow strata and the compression bearing arch structure in deep strata and the coupling mechanism between them were expounded.The field engineering application results show that the large thickness argllaceous layered roof coal roadway adopts different lengths of prestressed anchor cables with bolt support,and the deformation of surrounding rock and the breaking rate of bolt(cable)are significantly reduced during the whole service cycle,which effectively guarantees the stability of surrounding rock of coal roadway.

关 键 词：回采煤巷 泥质层状顶板 层状结构 文克尔地基梁 “梁-拱”耦合承载结构 

分 类 号：TD325[矿业工程—矿井建设] TD353