【摘要】：煤炭是我國國民經濟發(fā)展的主要能源，瓦斯災害連續(xù)多年影響著我國安全生產的總體形勢，而卸壓瓦斯抽采是煤層群瓦斯治理的重要途徑，可以改善煤礦安全生產條件、提高煤礦的經濟效益，實現(xiàn)煤與瓦斯安全共采。 系統(tǒng)地總結評述了近年來采動卸壓瓦斯運移理論和高位鉆孔治理瓦斯技術的研究成果及其應用現(xiàn)狀，結合五虎山煤礦1201綜采工作面開采條件，以室內煤巖體力學測試結果為基礎，采用ANSYS軟件，構建采場彈塑性模型，研究了采場圍巖應力-采動裂隙場分布規(guī)律及圍巖破斷空間的應力分布特征，進而判斷工作面上覆巖層受采動影響的“三帶”分布情況；在理論分析與Fluent數(shù)值模擬的基礎上，研究煤層群開采采動卸壓瓦斯分布規(guī)律、尾巷對采空區(qū)瓦斯分布的影響等，進一步研究了回采空間采動瓦斯流場分布規(guī)律。最后，結合工作面瓦斯涌出來源分析及涌出量預測，，將基于數(shù)值模擬試驗結果所設計的高位鉆孔抽采采動卸壓瓦斯方案在五虎山煤礦進行現(xiàn)場實驗，考察單個鉆孔抽采量隨推進距離、抽采時間等因素的變化特征，并最終確定高位鉆孔的合理布孔參數(shù)。 結果表明：數(shù)值模擬方法所得到的卸壓瓦斯抽采參數(shù)布置合理，高位鉆孔布置在采動裂隙場中，能取得良好的抽放效果，保證了工作面的安全生產，為優(yōu)化卸壓瓦斯抽采系統(tǒng)、實現(xiàn)煤與瓦斯安全共采提供了一定的理論依據(jù)和技術支持。
[Abstract]:Coal is the main source of energy for the development of national economy in our country. Gas disaster affects the overall situation of safety production in our country for many years, and unpressurized gas extraction is an important way to control gas in coal seam group, which can improve the safe production condition of coal mine. To improve the economic benefit of coal mine and realize the safe co-mining of coal and gas. This paper systematically summarizes and comments on the research achievements and application status of gas migration theory of mining movement and pressure relief in recent years and gas control technology with high drilling hole, combined with the mining conditions of 1201 fully mechanized mining face in Wuhushan Coal Mine. Based on the mechanical test results of indoor coal and rock mass, the elastic-plastic model of stope is constructed by using ANSYS software, and the distribution law of stress-mining fracture field and the stress distribution characteristics of surrounding rock fracture space are studied. On the basis of theoretical analysis and Fluent numerical simulation, the distribution law of mining pressure relief gas in coal seam group mining and the influence of tail roadway on gas distribution in goaf are studied. The distribution law of gas flow field in mining space is further studied. Finally, based on the analysis of the source of gas emission and the prediction of gas emission in the working face, field experiments are carried out in Wuhushan Coal Mine, which is based on the results of numerical simulation test. The variation characteristics of the extraction amount of a single borehole with the propulsive distance and extraction time were investigated, and the reasonable hole layout parameters of the high hole were determined. The results show that the pressure relief gas drainage parameters obtained by the numerical simulation method are reasonable, and the high level drilling holes are arranged in the mining fissure field, which can obtain a good drainage effect and ensure the safe production of the working face. In order to optimize the pressure relief gas drainage system, It provides certain theoretical basis and technical support to realize coal and gas safe co-mining.
【學位授予單位】：西安科技大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TD712

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