千米深井小煤柱沿空巷道围岩稳定性控制技术应用研究

发布时间：2018-07-21 11:45

【摘要】：煤矿开采进入深部以后,巷道围岩岩性特征与矿山压力分布规律与浅部开采存在较大的差异。深部巷道表现出高地应力、围岩低强度的特性,如仍延用浅部巷道支护设计方法,巷道围岩变形严重、返修量大、支护成本高,矿井安全开采控制难度增大。本文以王楼煤矿27304工作面回采巷道为工程背景,采用理论分析、数值模拟及现场工业性试验相结合的方法对千米深井采煤工作面沿空掘巷巷道围岩变形破坏规律及支护技术进行研究。首先,分析了沿空巷道上覆岩层在掘进前、掘进后及采煤工作面回采期间的结构特点及运动规律;其次,基于极限平衡区理论与弹性理论建立了深部沿空巷道围岩力学分析模型,分析了煤层埋深对沿空巷道围岩应力及位移分布的影响;采用FLAC3D软件模拟计算了留设3m、4m、5m、6m、7m、8m宽度的区段煤柱条件下巷道围岩位移与应力分布规律,结合理论计算结果得出了煤柱宽度留设的合理尺寸为4.5m;通过分析深部回采巷道变形破坏的原因,对王楼煤矿27304工作面沿空巷道支护方案重新设计并进行了现场工业性试验。现场观测表明:60d内巷道两帮最大移近量163mm;顶板最大下沉量76mm,并趋于稳定。采用新的支护方案后沿空巷道围岩变形得到有效控制,对深部开采条件下沿空巷道支护方案科学设计、矿井安全高效生产具有重要的指导意义。
[Abstract]:After the coal mining enters into the deep part, there are great differences between the lithologic characteristics of roadway surrounding rock and the distribution law of mine pressure and shallow mining. The deep roadway shows the characteristics of high ground stress and low strength of surrounding rock, such as the shallow roadway support design method is still used, the surrounding rock deformation of roadway is serious, the amount of repair is large, the support cost is high, and the difficulty of mine safety mining control is increased. Taking the mining roadway of 27304 working face of Wanglou Coal Mine as the engineering background, this paper adopts theoretical analysis. The method of numerical simulation and field industrial test is used to study the deformation and failure law of surrounding rock and supporting technology of roadway along goaf in kilometer deep coal mining face. Firstly, the structural characteristics and movement law of the overlying strata in the roadway along the goaf before, after the excavation and during the mining face are analyzed. Based on the limit equilibrium zone theory and elastic theory, a mechanical analysis model of deep goaf roadway surrounding rock is established, and the influence of coal seam burial depth on surrounding rock stress and displacement distribution of goaf roadway is analyzed. By using FLAC3D software, the displacement and stress distribution of surrounding rock of roadway under the condition of coal pillar width of 3 m, 4 m, 5 m, 6 m, 7 m and 8 m are simulated and calculated. According to the theoretical calculation results, the reasonable size of the width of coal pillar is 4.5 m. By analyzing the causes of deformation and failure of deep mining roadway, the supporting scheme of gob roadway in 27304 face of Wanglou Coal Mine is redesigned and the industrial test is carried out on the spot. The field observation shows that the maximum movement of the two sides of the roadway is 163mm in 60 days and the maximum subsidence of the roof is 76mm, which tends to be stable. The deformation of surrounding rock of gob roadway is controlled effectively by adopting new support scheme, which is of great significance for scientific design of roadway support scheme and safe and efficient production of mine under deep mining conditions.
【学位授予单位】：山东科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD353

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