本文選題：首采層開采 + 卸壓層��； 參考：《安徽理工大學(xué)》2015年碩士論文

【摘要】：礦井瓦斯災(zāi)害日趨嚴(yán)重,特別是煤與瓦斯突出事故時(shí)有發(fā)生,煤礦瓦斯治理成為煤礦安全至關(guān)重要的問題。為防治多煤層開采時(shí)煤與瓦斯的突出,采用首采層的卸壓作用,消除鄰近煤層的突出危險(xiǎn)性是行之有效、十分經(jīng)濟(jì)的區(qū)域性防突措施。由于淮南潘二煤礦4煤具有煤與瓦斯突出危險(xiǎn)性,所以選擇首先開采其下方平均間距為80m的沒有瓦斯突出危險(xiǎn)的3煤層,通過下首采層3煤的采動(dòng)影響,使得4煤卸壓,達(dá)到降低其瓦斯突出危險(xiǎn)性。 論文中采用理論分析、計(jì)算機(jī)數(shù)值模擬軟件以及結(jié)合工程實(shí)踐的研究方法,對下首采層回采后上被卸壓煤巖體的應(yīng)力分布特點(diǎn)、上伏煤巖體采動(dòng)裂隙動(dòng)態(tài)分布特征、煤層膨脹變形、遠(yuǎn)程卸壓瓦斯流動(dòng)規(guī)律、煤層卸壓范圍進(jìn)行系統(tǒng)的研究。利用數(shù)值計(jì)算模擬的方法研究了首采層開采影響上伏煤巖體應(yīng)力分布和膨脹變形等；通過現(xiàn)場實(shí)測考察了隨工作面的推進(jìn)首采層瓦斯壓力變化規(guī)律、透氣性變化規(guī)律、首采層在采動(dòng)影響下的膨脹變形規(guī)律和卸壓瓦斯抽放效果。 通過淮南潘二煤礦下首采層開采工程實(shí)踐表明,卸壓層得到了很好的卸壓效果,實(shí)際測量卸壓層4煤層的最大膨脹變形率為18.68‰；卸壓后4煤透氣性系數(shù)達(dá)到31.95m2/MPa2·d,4煤原始透氣性系數(shù)為0.054m2/MPa2·d,透氣性增大592倍。采用底板巷網(wǎng)格式穿層鉆孔瓦斯抽采技術(shù)對卸壓層進(jìn)行卸壓瓦斯抽采,保護(hù)范圍內(nèi)的4煤瓦斯抽采率達(dá)到64.1%,卸壓層殘余瓦斯含量為2.21m3/t,殘余瓦斯壓力降為0.16MPa,表明卸壓層取得良好的卸壓瓦斯抽放效果；被保護(hù)范圍內(nèi)的4煤的瓦斯含量得到大幅度減少,消除了突出危險(xiǎn)性,確保了卸壓層的安全開采。同時(shí)通過綜合對比分析表明,理論分析、數(shù)值模擬和現(xiàn)場試驗(yàn)研究所得到的結(jié)論具有很好的一致性。
[Abstract]:Mine gas disaster is becoming more and more serious, especially coal and gas outburst accidents occur from time to time. In order to prevent the outburst of coal and gas in multi-seam mining, it is an effective and economical regional anti-outburst measure to adopt the pressure-relief effect of the first coal seam and eliminate the outburst danger of the adjacent coal seam. Because of the danger of coal and gas outburst in No. 4 coal mine of Paner Coal Mine, Huainan Pan2 Coal Mine, the No. 3 coal seam which has no danger of gas outburst, which has an average distance of 80 m under the coal seam, is mined first, and the pressure relief of No. 4 coal is made through the influence of the mining effect of No. 3 coal in the lower first coal seam. To reduce the risk of gas outburst. In this paper, theoretical analysis, computer numerical simulation software and engineering practice are used to analyze the stress distribution and dynamic distribution of coal and rock mass under the upper pressure after the mining of the lower first mining strata, as well as the dynamic distribution characteristics of the mining fractures. The expansion deformation of coal seam, the law of gas flow in remote pressure relief, and the pressure relief range of coal seam are systematically studied. By using numerical simulation method, the stress distribution and expansion deformation of coal and rock mass affected by the first mining seam mining are studied, and the gas pressure and gas permeability of the first coal seam with the advance of the working face are investigated by field measurement. The law of expansion and deformation of the first mining bed under the influence of mining and the effect of pressure relief gas drainage. Through the engineering practice of mining the first coal seam in Paner Coal Mine, Huainan Pan2 Coal Mine, it is shown that the pressure relief layer has a good pressure relief effect, and the maximum expansion deformation rate of the 4 coal seam in the pressure relief layer is 18.68 鈥，

本文編號：1798749