發(fā)布時(shí)間：2018-03-13 19:10

  本文選題：上保護(hù)層　切入點(diǎn)：數(shù)值模擬　出處：《湖南科技大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著煤礦采深的增加,煤與瓦斯突出災(zāi)害程度嚴(yán)重,這一問題嚴(yán)重制約煤礦安全生產(chǎn),而開采保護(hù)層作為經(jīng)濟(jì)有效的區(qū)域防突措施應(yīng)當(dāng)優(yōu)先采用。本文以覺光寺煤礦24采區(qū)傾斜上保護(hù)層開采為研究背景,在理論分析、數(shù)值模擬實(shí)驗(yàn)以及現(xiàn)場(chǎng)考察的基礎(chǔ)上,研究了覺光寺煤礦上保護(hù)層開采的保護(hù)范圍和消突效果。(1)從理論分析的角度,研究了上保護(hù)層開采條件下被保護(hù)層應(yīng)力和位移變化規(guī)律。研究表明,上保護(hù)層開采后,煤巖體應(yīng)力受采動(dòng)影響重新分布,保護(hù)層下方底板煤巖體呈現(xiàn)出采前應(yīng)力集中、采后卸壓和應(yīng)力逐漸恢復(fù)的規(guī)律。(2)通過數(shù)值模擬實(shí)驗(yàn),對(duì)保護(hù)層開采后垂直應(yīng)力、垂直位移、塑性區(qū)的變化規(guī)律進(jìn)行了分析研究。確定上保護(hù)層沿傾向及走向的保護(hù)范圍。結(jié)果表明:按應(yīng)力卸壓保護(hù)準(zhǔn)則得出的5煤上保護(hù)層開采沿傾向的上、下卸壓角分別為72°和78°。沿走向的卸壓角為58.5°;按煤層變形準(zhǔn)則劃分的2456工作面開采的保護(hù)范圍沿傾向的上、下卸壓角分別為69°和75°。沿走向的卸壓角為55°。(3)在理論分析和數(shù)值模擬的基礎(chǔ)上對(duì)覺光寺煤礦24采區(qū)6煤被保護(hù)層進(jìn)行了現(xiàn)場(chǎng)考察,分析了考察區(qū)瓦斯壓力、瓦斯流以及滲透性系數(shù)等變化規(guī)律,確定瓦斯動(dòng)力參數(shù)變化“四帶”范圍。根據(jù)現(xiàn)場(chǎng)考察結(jié)果,計(jì)算出了覺光寺煤礦24采區(qū)上保護(hù)層開采的保護(hù)范圍的參數(shù):上保護(hù)層沿傾向上部的卸壓角為68.5°,傾向下部的卸壓為74.2°;沿走向的卸壓角為56.5°。被保護(hù)層保護(hù)范圍內(nèi)瓦斯壓力從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;煤層透氣性系數(shù)增加了600多倍,考察結(jié)果表明開采上保護(hù)層5煤能有效降低6煤的煤與瓦斯突出危險(xiǎn)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 擄and 78 擄, respectively. The angle of relief along the strike is 58.5 擄, 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 擄and 75 擄, respectively, and the relief angle along the strike is 55 擄. 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 擄, the pressure relief angle of the lower inclined layer is 74.2 擄, the pressure relief angle along the strike is 56.5 擄, 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.
【學(xué)位授予單位】：湖南科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TD713

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