动压影响下回采巷道变形破坏机理及加固技术研究 .pdfVIP

学兔兔 煤 炭 工 程 第48卷第1期 COAL ENGINEERING Vo1．48．No．1 doi：10．1 1799／ce201601O1 8 动压影响下回采巷道变形破坏机理及加固技术研究 臧 龙 (湖南省煤炭地质勘查院，湖南 长沙 410014) 摘 要：为解决区段煤柱上支承压力及工作面动压的叠加影响下的回采巷道围岩控制困难的 问题．针对大佛寺煤矿41103工作面运输巷的地质条件和巷道变形破坏特征，分析了巷道变形破 坏的主要原因及其加固机理，提出了在提高原有支护的支护强度与刚度的基础上，适时根据巷道 围岩状况和巷道围岩移动变形特点，采用更高强度的锚杆、锚索对原有锚网支护承载结构的薄弱 部位进行强化的加固技术方案。工程实践结果表明：在工作面回采期间，41103工作面运输巷两 帮及顶底板最大累计移近量分别控制在222mm、297mm左右，保证了巷道的正常使用要求。 关键词：煤柱支承压力；动压；回采巷道；支护承载结构；加固技术 中图分类号：TD322：TD353 文献标识码：A 文章编号：1671-0959(2016)0l一0059．04 Mechanism of mining roadway deformation and failure under dynamic pressure and the reinforcement technology ZANG Long (Hunan Coal GeoloNcN Exploration Institute，Changsha 410014，China) Abstract：Aiming at the difficulty in mining roadway surrounding rock control under cumulated influence of abutment pressure and dynamic pressure of sectional coal pillar，the paper analyzed main reasons and strengthening mechanism of the roadway deformation and failure，according to geological conditions and deformation characteristics of 41 103 working face transport roadway in Dafosi Coal Mine，and proposed a suppo~scheme，which enhanced original supposing strength and rigidity，and reinforced weak part of the bearing structure in bolt—mesh suppo~with stronger bolt and cable，according to the surrounding rock condition and characteristics of surrounding rock displacement and deformation．The engineering practice showed that，during the working face mining，the maximum total rib—to—rib convergence was 222mm and the