房柱式残煤复采煤柱稳定性研究

发布时间：2018-06-06 19:35

本文选题：残煤复采 + 煤柱宽度　；参考：《西安科技大学》2017年硕士论文

【摘要】：护巷煤柱回收是提高矿井柱式体系开采水平及资源回收率的重要途径。房柱式采煤法工艺简单,普遍应用于陕北地区的中小型煤矿。因其采出率低,大量的煤炭资源深埋地下,不仅造成资源浪费,还为采空区自燃提供了条件,是煤矿安全生产的重要隐患。随着资源整合的推进,众多矿区的边角煤及护巷煤柱回收问题受到了研究学者和工程技术人员的广泛关注。与传统的煤层房柱式开采相比,受煤层旧采区开采的叠加影响,复合残采区煤柱回收时的矿压显现特征、采场岩层和煤柱的移动变形、可行性判定方法均有所不同。因此,本文以陕北神府矿区某煤矿5-2号煤层房柱式开采实际情况为基础,理论计算确定护巷煤柱合理宽度范围;通过数值模拟,分析了旧采区煤柱群的稳定性,探讨确立复合残采区煤柱群稳定性判定依据;根据采场结构和现有开采条件,确定残采区矩形煤柱布置方案;研究了残采区不同宽度遗留煤柱回收的问题,得出煤柱群的应力、位移以及塑性区分布规律,从而确定护巷煤柱宽度,优化回收方案。结果表明:任何单一煤柱稳定性理论都具有局限性,根据极限平衡理论建立数学力学模型,求得煤柱回收的稳定宽度在15.6~20.2m范围内;结合经验公式求得护巷煤柱宽度为28.6m,综合分析得出煤柱合理宽度范围为15.6~28.6m。鉴于原有采空区煤柱群整体稳定,通过数值模拟分析了煤柱群稳定性的依存条件,并将其中最危险一组煤柱中的应力状态作为后续护巷煤柱回收过程中煤柱群稳定性判定依据;考虑到煤柱回收过程中的工程因素,设置了残采区采用采6留6的布置方案;4种不同宽度煤柱回收过程中,煤柱群应力、位移以及塑性区范围随护巷煤柱宽度的减小呈增大态势。计算得出,当护巷煤柱宽度不小于20m时,采场具有良好稳定性;当护巷煤柱宽度为16m时,残采区煤柱群应力集中程度加剧,位移量增大,塑性区范围扩展,无法保障煤柱稳定性的需求。本文的研究为回收房柱式采空区遗留煤柱资源、评价采空区稳定性提供了一条新的思路,为解决类似工程问题提供了借鉴性的研究方法,为进一步丰富和深化此类工程问题的研究体系奠定了良好的基础。
[Abstract]:Pillar recovery is an important way to improve mining level and resource recovery rate of pillar system. The method of house-pillar coal mining is simple and widely used in small and medium coal mines in northern Shaanxi. Because of its low extraction rate and large amount of coal resources buried underground, it not only causes waste of resources, but also provides conditions for spontaneous combustion in goaf, which is an important hidden danger in coal mine safety production. With the development of resource integration, the problem of coal pillar recovery from edge coal and roadway in many mining areas has been paid more and more attention by researchers and engineers. Compared with the traditional coal seam roof pillar mining, under the influence of the superposition of the old coal seam mining area, the characteristics of mine pressure, the movement and deformation of stope and pillar, and the feasibility judgment method are different when the coal pillar is recovered in the compound residual mining area. Therefore, based on the actual situation of a coal mine in Shenfu mining area in northern Shaanxi Province, the reasonable width of coal pillar in roadway is determined by theoretical calculation, and the stability of coal pillar group in old mining area is analyzed by numerical simulation. This paper discusses the basis for determining the stability of coal pillar group in compound residual mining area, determines the layout scheme of rectangular coal pillar in residual mining area according to stope structure and existing mining conditions, studies the problem of recovering coal pillar of different width in residual mining area, and obtains the stress of coal pillar group. The displacement and the distribution of plastic zone can determine the width of coal pillar and optimize the recovery scheme. The results show that any single coal pillar stability theory has its limitations. According to the limit equilibrium theory, the mathematical mechanics model is established, and the stable width of coal pillar recovery is obtained in the range of 15.6m ~ 20.2m; According to the empirical formula, the width of coal pillar in roadway protection is 28.6m, and the reasonable width range of coal pillar is 15.628.6m. In view of the overall stability of the coal pillar group in the original goaf, the dependent conditions for the stability of the coal pillar group are analyzed by numerical simulation, and the stress state in the most dangerous group is taken as the basis for judging the stability of the coal pillar group in the recovery process of the coal pillar in the follow-up roadway. Considering the engineering factors in the process of coal pillar recovery, the stress of coal pillar group in the process of recovery of coal pillar with 4 different widths has been set up in the residual mining area using the layout scheme of mining 6, stay 6 and 4 different widths. The displacement and plastic zone range increase with the decrease of coal pillar width. The results show that the stope has good stability when the width of coal pillar is not less than 20m, and when the width of pillar is 16m, the stress concentration of coal pillar group in residual mining area increases, the displacement increases, and the plastic zone expands. Unable to guarantee the stability of coal pillar. The research in this paper provides a new way of thinking for recovering the remaining coal pillar resources and evaluating the stability of the goaf, and provides a reference research method for solving similar engineering problems. It lays a good foundation for further enriching and deepening the research system of this kind of engineering problems.
【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】：TD82;TD322

【参考文献】