【摘要】：大同礦區(qū)開采歷史悠久,長期處于主采煤層為雙系易自燃煤層群的狀態(tài),在“兩硬”條件下近距離煤層群開采過程中,位于上部的幾層煤回采結(jié)束后,使用全部垮落法處理采空區(qū),回采下部煤層,這時將使上部多個煤層的采空區(qū)相互連通,造成回采工作面采空區(qū)漏風(fēng)通道增多,即形成了復(fù)雜的多層采空區(qū)流場。傳統(tǒng)的均壓理論無法解決這樣復(fù)雜的漏風(fēng)問題。針對大同礦區(qū)侏羅系層間距0-7 m極近距離易自燃煤層群上部多層采空區(qū)大范圍自然火災(zāi)對現(xiàn)有開采煤層工作面造成的嚴重威脅的問題,進行了系統(tǒng)深入研究。論文提出了多層采空區(qū)局部動態(tài)平衡理論和多點調(diào)控反饋補償整體平衡理論。運用數(shù)學(xué)方法分析采空區(qū)的氣體流動狀態(tài),確定開采工作面與相連通的鄰近采空區(qū)的氣體壓力在保持動態(tài)平衡情況下的最小容許調(diào)節(jié)范圍,并采用集中控制方法對多個調(diào)控點進行補償控制,以免相互影響,從而阻止CO、CH4等有害氣體流入開采工作面或新鮮風(fēng)流流入采空區(qū)。同時,研發(fā)了監(jiān)測、控制、變頻調(diào)壓為一體的多層采空區(qū)局部動態(tài)平衡技術(shù)與裝備,結(jié)合封堵、立體注氮、阻化灌漿等煤炭自然火災(zāi)防治技術(shù),取四臺礦、馬脊梁礦為例進行了應(yīng)用。經(jīng)實際應(yīng)用,系統(tǒng)運轉(zhuǎn)正常,實現(xiàn)了開采工作面與多層采空區(qū)流場風(fēng)壓保持動態(tài)平衡,有效的防止了上覆采空區(qū)的有毒有害氣體涌入工作面和新鮮風(fēng)流流入采空區(qū),實現(xiàn)了安全生產(chǎn)。
[Abstract]:Datong mining area has a long history of mining and has long been in the state that the main coal seam is a double system spontaneous combustion coal seam group. In the process of mining close distance coal seam group under the condition of "two hard", the coal layer located in the upper part is finished. All the caving methods are used to deal with the goaf and the lower coal seam is mined. At this time, the goaf of the upper coal seams will be connected with each other, resulting in the increase of the air leakage channels in the goaf of the mining face, that is, the formation of complex multilayer goaf flow field. The traditional theory of equal pressure can not solve such a complicated problem of air leakage. Aiming at the serious threat to the existing coal mining face caused by the large scale natural fire in the upper multi-layer goaf of the Jurassic strata in Datong mining area, which is 0-7 m short distance and easy to spontaneous combustion coal seam group, this paper makes a systematic and in-depth study on the problem. In this paper, the local dynamic equilibrium theory of multilayer goaf and the global equilibrium theory of multipoint feedback compensation are proposed. The gas flow state in goaf is analyzed by mathematical method, and the minimum allowable adjustment range of gas pressure in mining face and adjacent goaf is determined under the condition of keeping dynamic equilibrium. The centralized control method is used to compensate and control the multiple control points so as to prevent the harmful gases such as CO,CH4 from flowing into the mining face or the fresh air flow into the goaf. At the same time, research and development of local dynamic balance technology and equipment of multi-layer goaf with monitoring, control and frequency conversion and pressure regulation, combined with coal natural fire prevention and control technology, such as blocking, stereoscopic nitrogen injection, blocking grouting, etc., The Majiiliang Mine is used as an example. Through the practical application, the system runs normally, realizes the dynamic balance of the wind pressure between the mining face and the multi-layer goaf flow field, effectively prevents the toxic and harmful gas from overlying goaf from pouring into the face and the fresh air flow into the goaf. Safety in production has been realized.
【學(xué)位授予單位】：遼寧工程技術(shù)大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：TD752.2

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