大南湖一矿三软煤层巷道变形规律与支护技术研究

发布时间：2018-03-16 03:16

本文选题：巷道不对称变形　切入点：区段煤柱　出处：《西安科技大学》2017年硕士论文　论文类型：学位论文

【摘要】：软岩巷道的支护问题是煤炭安全高效开采过程中亟待研究的课题之一,然而由于软岩岩体受水易变形和岩体的蠕变特性,布置于软岩中的巷道围岩易受应力和水的影响,导致巷道因布置环境不同而出现不同形式的变形破坏。研究软岩巷道变形破坏规律对于巷道安全支护和工作面的正常回采至关重要。论文以大南湖一矿为工程背景,采取现场探测和地质特征调查分析、理论分析、数值模拟和现场监测相结合的综合分析方法,研究了大南湖一矿回风巷道变形机理和支护技术,通过对大南湖一矿1303工作面、1304工作面回风巷道现场地质调研、钻孔窥视仪的监测和巷道围岩采样物理力学试验,得出巷道围岩岩性为软岩,围岩易软化、泥化,易风化分解,同时分析了巷道变形破坏机理;对巷道围岩采用弹塑性变形理论并建立力学模型,得出工作面侧向压力影响范围为53.95m,回风巷道塑性变形范围为2.5m;依据回风巷道赋存环境、变形破坏机理和巷道围岩塑性区范围,提出相应的巷道支护优化方案并借助FLAC3D数值计算软件,对巷道优化支护方案进行比较分析,得出1303回风巷道采用加强支护,减少了巷道变形及地下水的影响,1304回风巷道采用基本支护,实现了巷道稳定支护;优化后的支护方案经过现场监测,巷道围岩变形得到有效改善,保障了巷道围岩的稳定性,取得了良好的支护效果。本论文研究成果对大南湖一矿安全回采具有重要指导意义,研究成果对于类似软岩巷道的支护具有一定借鉴意义。
[Abstract]:The supporting problem of soft rock roadway is one of the urgent research topics in the process of safe and efficient mining of coal. However, because soft rock mass is easily deformed by water and creep characteristics of rock mass, the surrounding rock of roadway arranged in soft rock is easily affected by stress and water. It is very important to study the deformation and failure law of soft rock roadway for the safe support of roadway and the normal mining of working face. The deformation mechanism and supporting technology of return wind roadway in Dananhu No. 1 Mine are studied by the methods of field detection and geological characteristics investigation and analysis, theoretical analysis, numerical simulation and field monitoring. Based on the field geological investigation, monitoring of borehole peeking instrument and physical and mechanical test of surrounding rock sampling, it is concluded that the rock property of roadway surrounding rock is soft rock, the surrounding rock is easy to soften, muddy and decompose easily. At the same time, the mechanism of roadway deformation and failure is analyzed, and the elastic-plastic deformation theory and mechanical model are established for surrounding rock of roadway, and the influence range of lateral pressure in working face is 53.95m, and the plastic deformation range of backwind roadway is 2.5m.According to the existing environment of backwind roadway, The mechanism of deformation and failure and the range of plastic zone of surrounding rock of roadway are put forward, and the corresponding optimization scheme of roadway support is put forward and compared with that of FLAC3D numerical calculation software, and it is concluded that 1303 return air roadway adopts reinforced support. The deformation of roadway and the influence of underground water are reduced. The basic support is adopted in the return air roadway of No. 1304, and the stable support of roadway is realized. After the site monitoring, the deformation of surrounding rock of roadway is effectively improved, and the stability of surrounding rock of roadway is guaranteed. The research results of this paper have important guiding significance for safe mining in Dananhu No. 1 Mine, and the research results have certain reference significance for the support similar to soft rock roadway.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD322;TD353

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