厚煤层残煤复采工作面巷道支护技术研究

发布时间：2018-12-16 19:25

【摘要】：煤炭是不可再生资源,在我国经济社会生活中扮演着不可替代的角色。随着多年来优质煤层的快速开采,煤炭资源已接近枯竭,如何最大限度地回收残留煤炭资源自然提上了研究的日程。虎峰煤业厚煤层上分层经落后的类条带式采煤法开采后,残留有大量的优质的煤炭资源。对这部分残煤的资源的复采,对提高煤矿的回采率有重要意义。而复采这部分煤炭资源时,工作面巷道因围岩破碎严重而变得比一般巷道难以支护。故研究这类围岩条件下适合的支护方法,对煤矿的安全高效生产具有很大现实意义。本论文针对虎峰煤业厚煤层下分层复采工作面巷道围岩的特殊破坏情况,采用现场调研、数值模拟的研究方法,根据围岩破坏特点,有针对性地对该类条件下巷道围岩的矿压显现规律与围岩压力状态进行分析,并对工作面巷道围岩的支护进行合理地设计,通过对比各方案的数值模拟效果,确定最佳支护方式,并给出支护参数:(1)当复采巷道上方遇旧采空区顶板未垮落时:采用工字钢棚支护,排距为700 mm;(2)当复采巷道上方遇旧采空区顶板垮落时,采用短锚杆+工字钢棚方式支护:a、顶煤厚度为1.2 m时:锚杆长1.0 m,间排距900 mm×900 mm;工字钢棚排距700 mm;b、顶煤厚度为1.4 m时,锚杆长1.2 m,间排距900 mm×900 mm;工字钢棚排距700 mm;c、顶煤厚度为1.6 m时,锚杆长1.4 m,间排距900 mm×900 mm;工字钢棚排距700 mm;(3)当复采巷道上方遇煤柱时,为长锚杆+锚索+金属网支护方式,顶锚杆长2500 mm,间排距900 mm×900 mm;锚索长8200 mm,间排距为1900mm×1500 mm。
[Abstract]:Coal is a non-renewable resource and plays an irreplaceable role in our country's economic and social life. With the rapid mining of high quality coal seams for many years, coal resources have been nearly exhausted, and how to recover the remaining coal resources to the maximum extent has naturally been put on the agenda of research. After laggard strip mining on thick coal seam of Hufeng coal industry, there is a large amount of high quality coal resources left behind. It is of great significance to improve the recovery rate of coal mine by remining the residual coal resources. When mining this part of coal resources, the roadway is more difficult to support than the common roadway because of the serious surrounding rock fragmentation. Therefore, it is of great practical significance to study the suitable supporting methods under the surrounding rock conditions for the safe and efficient production of coal mines. According to the special failure situation of roadway surrounding rock in thick coal seam of Hufeng coal industry, this paper adopts field investigation and numerical simulation research method, according to the characteristics of surrounding rock failure. According to the analysis of rock pressure behavior law and surrounding rock pressure state of roadway surrounding rock under this kind of condition, the support of roadway surrounding rock in working face is designed reasonably, and the numerical simulation effect of each scheme is compared. Determine the best support mode and give the support parameters: (1) when the roof of the old goaf does not fall over the mining roadway: I steel shed support, the row distance is 700 mm; (2) when the roof of the old goaf collapses above the mining roadway, the short bolt I-steel shed is used to support: a, when the thickness of the top coal is 1.2m, the length of the bolt is 1.0 m, and the interval between them is 900 mm 脳 900 mm; I-shaped steel shed, 700 mm;. B, when the thickness of top coal is 1.4 m, the length of anchor rod is 1.2 m, the length of anchor rod is 1.4 m, the length of bolt is 1.4 m, and the distance between row distance is 900 mm 脳 900 mm; I-shaped steel shed, when the distance between row distance is 900 mm 脳 900 mm;, the length of anchor rod is 1.4 m, and the distance between row distance is 900 mm 脳 900 mm;, when the thickness of top coal is 1. 6 m. (3) when the coal pillar is met above the mining roadway, it is a long bolt bolting wire mesh support mode, and the length of the roof bolt is 2500 mm 脳 900 mm; cable length 8200 mm, the length of the roof bolt is 1900mm 脳 1500 mm. (3) when the coal pillar is met above the mining roadway, the length of the roof bolt is 2500 mm 脳 900 mm;.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD353

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