象山煤矿煤巷围岩稳定性分析及支护技术研究

发布时间：2018-06-05 16:55

本文选题：煤巷 + 围岩稳定性　；参考：《西安科技大学》2017年硕士论文

【摘要】：韩城矿区位于陕西省鄂尔多斯盆地东南边缘,矿区浅部断裂和褶皱发育,对煤层结构破坏严重,矿井生产过程中,巷道的掘进和支护比较困难,特别是煤巷的支护和维护,耗费了大量的人力物力,开采成本较大。论文以韩城矿区象山煤矿为研究对象,选取21503工作面巷道为典型煤巷代表,对原有支护情况进行分析总结,分析了煤巷围岩失稳机理,提出了相应的围岩控制技术,优化了支护参数,为韩城矿区类似条件煤巷支护提供理论和技术参考。在现场调研的基础上,采用理论分析与数值模拟相结合的方法展开研究。研究可得,21503工作面开始回采时,回风巷受二次采动影响,发生强烈变形,是巷道围岩失稳的根本原因。由于水平构造力影响,为工作面服务的顺槽受超前支承压力、相邻工作面巷道和采空区侧向支承压力的共同影响,巷道出现强烈收敛变形。巷道围岩在变形过程中,围岩位移方向均指向巷道空间,巷道围岩变形以顶板下沉和两帮不对称位移为主,左帮围岩扰动范围明显大于右帮。因此,提出了以结构补偿为基础的围岩分区控制技术,对煤巷进行分类支护。采用优化后的支护方案后,巷道围岩稳定性明显提高,底臌量明显降低,小于0.01m。两帮表面位移量由支护前的0.19m降至0.08m左右,巷道顶板位移量控制在0.03m～0.06m范围内。巷道整体稳定性增强,围岩控制效果较好,经济和技术效果显著。
[Abstract]:Hancheng mining area is located in the southeast edge of Ordos Basin, Shaanxi Province. The shallow fault and fold are developed in the mining area, which seriously damages the coal seam structure. During the process of mine production, it is difficult to excavate and support the roadway, especially the support and maintenance of coal roadway. It consumes a lot of manpower and material resources, and the mining cost is large. This paper takes Xiangshan Coal Mine in Hancheng Mining area as the research object, selects 21503 face roadway as the representative of typical coal roadway, analyzes and summarizes the original supporting situation, analyzes the mechanism of surrounding rock instability in coal roadway, and puts forward the corresponding surrounding rock control technology. The supporting parameters are optimized to provide theoretical and technical reference for coal roadway support under similar conditions in Hancheng mining area. On the basis of field investigation, theoretical analysis and numerical simulation are used to carry out the research. It is studied that when coal mining begins in the coal face of No. 21503, the backwind roadway is affected by the secondary mining movement and has strong deformation, which is the fundamental cause of the rock instability of the roadway. Due to the influence of horizontal tectonic force, the working face is served by the leading support pressure, the adjacent face roadway and the side support pressure of the goaf, so the roadway has strong convergence deformation. During the deformation of surrounding rock of roadway, the direction of displacement of surrounding rock all points to the space of roadway. The deformation of surrounding rock of roadway is dominated by roof subsidence and asymmetric displacement of two bands, and the disturbance range of surrounding rock of left side is obviously larger than that of right side. Therefore, the partition control technology of surrounding rock based on structural compensation is put forward to support coal roadway classified. After adopting the optimized support scheme, the stability of roadway surrounding rock is obviously improved, and the floor heave is obviously reduced, less than 0.01 m. The surface displacement of the two sides is reduced from 0.19 m to 0.08 m, and the displacement of roadway roof is controlled in the range of 0.03m~0.06m. The overall stability of roadway is enhanced, the control effect of surrounding rock is better, and the economic and technical effect is remarkable.
【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】：TD353;TD322.4

【参考文献】