觉光寺煤矿上保护层开采卸压影响范围及消突效果研究

发布时间：2018-03-13 19:10

本文选题：上保护层　切入点：数值模拟　出处：《湖南科技大学》2016年硕士论文　论文类型：学位论文

【摘要】：随着煤矿采深的增加,煤与瓦斯突出灾害程度严重,这一问题严重制约煤矿安全生产,而开采保护层作为经济有效的区域防突措施应当优先采用。本文以觉光寺煤矿24采区倾斜上保护层开采为研究背景,在理论分析、数值模拟实验以及现场考察的基础上,研究了觉光寺煤矿上保护层开采的保护范围和消突效果。(1)从理论分析的角度,研究了上保护层开采条件下被保护层应力和位移变化规律。研究表明,上保护层开采后,煤岩体应力受采动影响重新分布,保护层下方底板煤岩体呈现出采前应力集中、采后卸压和应力逐渐恢复的规律。(2)通过数值模拟实验,对保护层开采后垂直应力、垂直位移、塑性区的变化规律进行了分析研究。确定上保护层沿倾向及走向的保护范围。结果表明:按应力卸压保护准则得出的5煤上保护层开采沿倾向的上、下卸压角分别为72°和78°。沿走向的卸压角为58.5°;按煤层变形准则划分的2456工作面开采的保护范围沿倾向的上、下卸压角分别为69°和75°。沿走向的卸压角为55°。(3)在理论分析和数值模拟的基础上对觉光寺煤矿24采区6煤被保护层进行了现场考察,分析了考察区瓦斯压力、瓦斯流以及渗透性系数等变化规律,确定瓦斯动力参数变化“四带”范围。根据现场考察结果,计算出了觉光寺煤矿24采区上保护层开采的保护范围的参数:上保护层沿倾向上部的卸压角为68.5°,倾向下部的卸压为74.2°;沿走向的卸压角为56.5°。被保护层保护范围内瓦斯压力从1.5Mpa~2.12MPa降到0.1Mpa~0.4MPa;瓦斯含量由18.38m3/t降至4.28m3/t以下;煤层透气性系数增加了600多倍,考察结果表明开采上保护层5煤能有效降低6煤的煤与瓦斯突出危险性,消突效果良好。
[Abstract]:With the increase of coal mining depth, the degree of coal and gas outburst disaster is serious, which seriously restricts the safety of coal mine production. The mining protective layer should be adopted as an economical and effective measure to prevent outburst. In this paper, based on theoretical analysis, numerical simulation experiment and field investigation, the mining of protective layer in No. 24 mining area of Jiuguangsi Coal Mine is taken as the research background. This paper studies the protection range and outburst suppression effect of the upper protective layer mining in Chueguangsi Coal Mine. From the angle of theoretical analysis, the variation of stress and displacement of the protective layer under the mining condition of the upper protective layer is studied. The results show that, after the mining of the upper protective layer, the change of the stress and displacement of the protective layer is studied. The stress of coal and rock mass is redistributed by mining, and the stress concentration of coal and rock mass on the floor below the protective layer appears before mining, and the law of unloading pressure and gradually recovering stress after mining. (2) through the numerical simulation experiment, the vertical stress and vertical displacement of the protective layer after mining are studied. The variation law of plastic zone is analyzed and studied. The protection range along the tendency and strike of the upper protective layer is determined. The results show that the mining edge tendency of the upper protective cover of 5 coal is obtained according to the stress relief protection criterion. The angle of lower pressure relief is 72 掳and 78 掳, respectively. The angle of relief along the strike is 58.5 掳, and the mining protection range of 2456 working face, which is divided according to the criterion of coal seam deformation, is higher than that of tendency. The unloading angles are 69 掳and 75 掳, respectively, and the relief angle along the strike is 55 掳. Based on the theoretical analysis and numerical simulation, a field investigation is carried out on the No. 6 coal cover in the No. 24 mining area of Jiuguangsi Coal Mine, and the gas pressure in the investigation area is analyzed. The variation law of gas flow and permeability coefficient is used to determine the range of "four zones" of gas dynamic parameters. The parameters of protection range of upper protective layer mining in No. 24 mining area of Jiuguangsi Coal Mine are calculated. The pressure relief angle of the upper protection layer along the inclination is 68.5 掳, the pressure relief angle of the lower inclined layer is 74.2 掳, the pressure relief angle along the strike is 56.5 掳, and the protected layer protection range is Geneva. The gas content decreased from 18.38 m3 / t to 4.28 m3 / t, and the pressure decreased from 1.5 Mpa-2.12MPa to 0.1Mpa-0.40MPa, and the gas content decreased from 18.38m3pt to 4.28m3pt. The permeability coefficient of coal seam has increased by more than 600 times. The result of investigation shows that the coal of upper protective layer 5 can effectively reduce the danger of coal and gas outburst of coal No. 6, and the outburst suppression effect is good.
【学位授予单位】：湖南科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TD713

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