發(fā)布時間：2018-04-27 09:24

  本文選題：近距離煤層 + 協(xié)調(diào)同采　； 參考：《中國礦業(yè)大學(xué)（北京）》2015年博士論文

【摘要】：近距離煤層群在我國廣泛賦存。近距離煤層群在同時開采的過程中，鄰近層采空區(qū)之間易形成大量裂隙通道而發(fā)生漏風(fēng)現(xiàn)象，從而使采空區(qū)內(nèi)氣體運(yùn)移規(guī)律與單層開采情況會有所不同，采空區(qū)自然發(fā)火危險性區(qū)域的難以準(zhǔn)確確定，給采空區(qū)自燃預(yù)防和防治帶來了極大困難。論文針對南陽坡3#、4#煤層近距離上下協(xié)調(diào)同采，進(jìn)行了現(xiàn)場應(yīng)力分布測試，同時借助數(shù)值計算軟件進(jìn)行解算確定了合理錯距。上下煤層之間產(chǎn)生大量相連通的裂隙，存在煤層間漏風(fēng)，煤層自燃危險區(qū)域的分布規(guī)律也更加復(fù)雜。基于此進(jìn)行了滲透系數(shù)實(shí)驗(yàn)，在合理假設(shè)的基礎(chǔ)上建立了采空區(qū)氣體流動數(shù)學(xué)模型�；谏舷揎L(fēng)速、下限氧濃度指標(biāo)體系，建立了采空區(qū)危險性區(qū)域判定機(jī)理。借助數(shù)值數(shù)值計算軟件COMSOL Multiphysics對采空區(qū)流場進(jìn)行了解算。通過設(shè)定不同錯距，對上下煤層采空區(qū)流場進(jìn)行了數(shù)值模擬，得出了錯距與采空區(qū)危險區(qū)域的關(guān)系式�；诘V壓顯現(xiàn)規(guī)律，結(jié)合采空區(qū)自燃帶的寬度，對上分層采空區(qū)采取了注氮防滅火技術(shù)。通過計算與現(xiàn)場監(jiān)測，，基于煤層自然發(fā)火期和工作面回采速度確定了經(jīng)濟(jì)合理的注氮量。根據(jù)現(xiàn)場設(shè)備注氮能力，確定了上下同采的合理錯距為89m，既保證了安全回采和礦井產(chǎn)量，又達(dá)到了防止采空區(qū)遺煤氧化自燃的發(fā)生，取得了良好的經(jīng)濟(jì)和社會效益。
[Abstract]:The close range coal seam group exists widely in our country. In the process of mining at the same time, a large number of fissure channels are easily formed between the goaf of the adjacent layer, which makes the gas migration in the goaf different from that of the single layer mining, and the area of the spontaneous combustion danger Zone in the goaf is difficult to be accurately determined. The prevention and control of spontaneous combustion in the air zone has brought great difficulties. In this paper, according to the close range of the 3# and 4# coal seam in the Nanyang slope, the distribution of the stress distribution is measured. At the same time, the reasonable error is determined by the numerical calculation software. There are a large number of connected cracks between the upper and lower coal beds, the leakage of coal seam and the dangerous zone of spontaneous combustion of coal seam. The distribution law of the domain is also more complex. Based on this, the permeability coefficient experiment is carried out and a mathematical model of the gas flow in the goaf is established on the basis of the reasonable hypothesis. Based on the upper limit wind speed and the lower oxygen concentration index system, the hazard regional determination mechanism of the goaf is established. The calculation software COMSOL Multiphysics is used to calculate the goaf flow with the numerical value value. Through setting the different staggered distance, the flow field in the goaf of the upper and lower coal seam is numerically simulated, and the relation between the fault distance and the dangerous area of the goaf is obtained. Based on the law of the ore pressure and the width of the spontaneous combustion zone in the goaf, the nitrogen injection and extinguishing technology is adopted in the upper stratified goaf. The natural ignition period and the working face recovery speed determine the reasonable amount of nitrogen injection. According to the capacity of nitrogen injection in the field equipment, the reasonable error distance of the same mining is determined to be 89m, which not only ensures the safety recovery and the mine production, but also prevents the spontaneous combustion of the coal oxide from the coal in the goaf, and has obtained good economic and social benefits.

【學(xué)位授予單位】：中國礦業(yè)大學(xué)（北京）
【學(xué)位級別】：博士
【學(xué)位授予年份】：2015
【分類號】：TD752.2

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本文編號：1810163