沁新煤矿遗留煤柱内沿空留巷围岩控制技术研究

发布时间：2018-06-04 18:25

本文选题：遗留煤柱 + 沿空留巷　；参考：《中国矿业大学》2015年硕士论文

【摘要】：沿空留巷符合绿色采矿、科学采矿的发展方向,是一项很有前景的技术。遗留煤柱内沿空留巷的围岩受力和变形比较复杂。本文在前人研究的基础上,综合运用理论分析、三维数值模拟计算、和工业性试验相结合的方法,深入的研究了遗留煤柱内沿空留巷的特点,提出了遗留煤柱内沿空留巷围岩控制技术,并指导工程实践应用,取得了如下成果:研究了遗留煤柱内沿空留巷两侧采空时顶板的破断形式,得出了遗留煤柱稳定的条件。利用数值模拟软件分析了不同宽度遗留煤柱两侧采动影响下,煤柱内的塑性区和垂直应力分布情况,从而得出垂直应力呈“马鞍形”分布时遗留煤柱处于稳定状态,此时煤柱宽度为20m。然后通过理论计算的方式验证了20m遗留煤柱的合理性。在合理宽度遗留煤柱条件下,利用数值模拟软件分析了两个工作面回采时,遗留煤柱在超前、滞后采动影响下应力应变演化规律,提出了围岩加卸载原理,为围岩的控制技术提供理论依据。根据遗留煤柱内沿空留巷围岩的加卸载原理,确定采用高预紧力、高强锚杆与锚索支护体系作为沿空留巷的巷内基本支护形式。同时根据沿空留巷围岩的变形规律,提出了沿空留巷段加强支护技术方案,与巷内支护共同维护围岩的稳定性。上述研究成果在沁新煤矿2203工作面运输顺槽获得了成功应用,并为以后相似条件下的沿空留巷技术提供了参考和依据。
[Abstract]:It is a promising technology to keep the roadway along the gob in line with the development direction of green mining and scientific mining. The surrounding rock force and deformation of the roadway left along the gob in the left coal pillar are quite complex. On the basis of previous studies, this paper makes a thorough study of the characteristics of the coal pillar left along the gob by using the methods of theoretical analysis, three-dimensional numerical simulation and industrial test. This paper puts forward the control technology of surrounding rock along the gob retaining roadway in the left coal pillar, and instructs the engineering practice and application, and obtains the following achievements: the breakage form of roof in both sides of the coal pillar along the gob is studied, and the condition of the stability of the left coal pillar is obtained. By using numerical simulation software, the plastic zone and vertical stress distribution in the pillar under the influence of mining on both sides of the coal pillar with different widths are analyzed. It is concluded that the residual coal pillar is in a stable state when the vertical stress is "saddle-shaped" distribution. The width of coal pillar is 20m. Then the rationality of 20m coal pillar is verified by theoretical calculation. Under the condition of reasonable width of residual coal pillar, the evolution law of stress and strain under the influence of lead and lag of coal pillar in two mining face is analyzed by using numerical simulation software, and the principle of loading and unloading of surrounding rock is put forward. It provides a theoretical basis for the control technology of surrounding rock. According to the principle of loading and unloading of surrounding rock around gob retaining roadway in coal pillar, high pretightening force, high strength anchor rod and anchor cable supporting system are adopted as the basic supporting form of roadway along goaf. At the same time, according to the deformation law of the surrounding rock along the gob retaining roadway, the technical scheme of strengthening the support along the gob retaining section is put forward to maintain the stability of the surrounding rock together with the support in the roadway. The above research results have been successfully applied in the transportation of the smooth channel in Qinxin 2203 coal face, and have provided a reference and basis for the technology of gob-side retaining roadway under similar conditions in the future.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD353

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