【摘要】：煤與瓦斯突出是各種煤礦災(zāi)害中較為嚴重的,其中采空區(qū)上隅角瓦斯積聚導(dǎo)致的事故是煤與瓦斯突出礦井面臨的共同課題,為找到合適而又經(jīng)濟可行的解決方法,我國大量的煤礦工作者和專家經(jīng)過多年的研究和實踐,眾多可喜的理論和措施也隨之涌現(xiàn)了出來——高位巷抽采、預(yù)埋管路抽采、地面鉆井抽采、頂板高位斜交鉆孔抽采等。在考察了淮北礦業(yè)集團蘆嶺煤礦的試驗采面后,為解決試驗采面采空區(qū)上隅角積聚的瓦斯問題,并期望為類似的地質(zhì)開采環(huán)境下的采空區(qū)上隅角瓦斯抽采提供有價值的參考。本文采用彈性力學(xué)、滲流力學(xué)、巖體力學(xué)等基礎(chǔ)理論,通過理論分析、數(shù)值模擬和現(xiàn)場試驗考察等研究途徑,較為全面的研究了蘆嶺煤礦Ⅱ817工作面開采后上覆巖層裂隙帶范圍、裂隙帶內(nèi)瓦斯流動規(guī)律及抽采效果,研究成果可為采空區(qū)上隅角瓦斯抽采提供重要的參考。 在對蘆嶺煤礦Ⅱ817工作面采場上覆煤巖體的受力狀態(tài)(工作面傾向)進行分析后,得出了上被保護層的應(yīng)力和下沉量的表達式,在此理論分析的基礎(chǔ)之上,結(jié)合經(jīng)驗公式和現(xiàn)場實測數(shù)據(jù)后,確定了Ⅱ817工作面采場上覆巖體的裂隙帶的高度,由此為下一步的高位抽采鉆場的布置提供了理論上最佳的位置。 在對比各種治理采空區(qū)上隅角積聚瓦斯的措施的優(yōu)缺點后,結(jié)合試驗采面的具體地質(zhì)特征和開采方式以及淮北礦業(yè)集團對瓦斯治理的總體要求,最終確定在Ⅱ817工作面采空區(qū)上隅角瓦斯治理課題中使用頂板高位斜交鉆孔抽采法來完成本課題的研究。在試驗采面推進方向上每隔一定距離布置一個高位鉆場,高位鉆孔參數(shù)各項參數(shù)分別為：鉆孔有效長度為100m左右,鉆場間距為70m,鉆孔壓茬距離為20m,每個鉆場布置6個呈半扇形分布的鉆孔,開孔間距0.3m,距底板1.0m。通過布置在裂隙帶內(nèi)的高位鉆場向與開采方向反方向施工高位抽采鉆孔,在試驗采面開采推進過程中,對試驗采面上隅角瓦斯的濃度以及抽采鉆孔的瓦斯抽采純量等瓦斯治理指標來考查抽采效果。對于參數(shù)優(yōu)化后的頂板高位斜交鉆孔抽采效果進行考察,Ⅱ817-1工作面從2011年11月開始回采,從2011年11月至2012年3月對頂板高位斜交鉆孔抽放效果進行了考察。管路瓦斯抽放體積分數(shù)逐步增大,從3.6%浮動到13.8%,平均值穩(wěn)定在8.3%左右,最大抽放體積分數(shù)為13.8%,最大抽放瓦斯純流量為6.6m3/min。工作面抽放量較高,占90%以上,工作面杜絕了瓦斯超限現(xiàn)象,達到了很好的治理效果。由此可以認為經(jīng)過抽采達到了有效較低該采面采空區(qū)上隅角積聚瓦斯的目的。
[Abstract]:Coal and gas outburst is a serious disaster in all kinds of coal mine. The accident caused by gas accumulation in the upper corner of goaf is a common problem faced by coal and gas outburst mine. After many years of research and practice by a large number of coal miners and experts in our country, many gratifying theories and measures have emerged, such as extraction of high level roadways, extraction of pre-buried pipes, extraction of surface drilling and extraction of high inclined roof boreholes and so on. After investigating the test mining face of Luling Coal Mine of Huaibei Mining Group, this paper aims at solving the gas accumulation problem in the upper corner of the goaf of the test mining face and expects to provide valuable reference for the gas drainage in the upper corner of the goaf under the similar geological mining environment. In this paper, the basic theories of elastic mechanics, seepage mechanics and rock mass mechanics are adopted, and through theoretical analysis, numerical simulation and field test investigation, etc. In this paper, the scope of overlying rock fracture zone, the gas flow law and the effect of gas drainage in the upper corner of Luling coal mine after mining are studied. The research results can provide an important reference for gas extraction in the upper corner of goaf. Based on the analysis of the stress state (face inclination) of the overlying coal and rock mass in the 鈪，

本文編號：2408335