本文關(guān)鍵詞： 高瓦斯 采空區(qū) 抽放 自然發(fā)火 數(shù)值模擬　出處：《西安科技大學(xué)》2013年碩士論文　論文類型：學(xué)位論文

【摘要】：煤層自燃火災(zāi)嚴(yán)重威脅著我國(guó)礦井安全生產(chǎn)，其可能引發(fā)瓦斯、煤塵爆炸事故，釀成人員傷亡等的重大惡性事故。高瓦斯礦采空區(qū)浮煤自燃更是我們急需解決的問(wèn)題，它直接影響礦井工作面的安全生產(chǎn)。 綜采放頂煤技術(shù)對(duì)礦井實(shí)現(xiàn)高產(chǎn)高效起到重要作用。但是，由于綜放面開采煤層厚度大，尤其是采空區(qū)“兩道”“兩線”頂煤放出率低，造成“兩道”“兩線”處遺煤量較多，高瓦斯礦井為減小采空區(qū)瓦斯?jié)舛�，�?shí)施高抽巷和瓦斯排放專用巷對(duì)采空區(qū)瓦斯進(jìn)行抽放，加大了采空區(qū)漏風(fēng)，增加了浮煤自燃危險(xiǎn)性。因此，準(zhǔn)確判定綜放采空區(qū)在抽放條件下浮煤自燃危險(xiǎn)區(qū)域的位置是預(yù)防和撲滅采空區(qū)自然發(fā)火的關(guān)鍵。 本文以黃巖匯煤礦15109工作面為研究背景，從高瓦斯礦井抽放條件下綜放采空區(qū)浮煤自燃的特點(diǎn)出發(fā)，對(duì)其采空區(qū)在高抽巷及瓦斯排放專用巷同時(shí)運(yùn)行條件下的漏風(fēng)流場(chǎng)及氧濃度分布進(jìn)行數(shù)值模擬研究。首先，在目前的煤自然發(fā)火機(jī)理、滲流力學(xué)、自然發(fā)火預(yù)測(cè)、自燃危險(xiǎn)區(qū)域判定及數(shù)值模擬研究現(xiàn)狀的基礎(chǔ)上，通過(guò)實(shí)驗(yàn)?zāi)M測(cè)定煤層自然發(fā)火相關(guān)特性參數(shù)，利用相關(guān)學(xué)科知識(shí)，建立綜放采空區(qū)在高抽巷及瓦斯排放專用巷同時(shí)運(yùn)行條件下氣體滲流預(yù)測(cè)模型，，對(duì)其進(jìn)行數(shù)值模擬計(jì)算。然后，通過(guò)改變高抽巷抽采負(fù)壓來(lái)研究其對(duì)采空區(qū)“三帶”的影響。最后，根據(jù)實(shí)際現(xiàn)場(chǎng)觀測(cè)，對(duì)綜放采空區(qū)在高抽巷及瓦斯排放專用巷同時(shí)運(yùn)行條件下采空區(qū)自燃危險(xiǎn)區(qū)域進(jìn)行靜態(tài)劃分，驗(yàn)證建立的數(shù)學(xué)模型的可靠性和準(zhǔn)確性。研究結(jié)果對(duì)指導(dǎo)同類型礦井采空區(qū)煤自燃防治具有極大的意義。
[Abstract]:Spontaneous combustion of coal seam is a serious threat to the safety of mine production in China, which may lead to gas, coal dust explosion accident. It is an urgent problem for us to solve the problem of spontaneous combustion of floating coal in goaf of high gas mine, which directly affects the safety of mine face. Fully mechanized top coal caving technology plays an important role in realizing high yield and high efficiency in coal mine. However, because of the large thickness of coal seam in fully mechanized caving face, especially the low caving rate of "two channels" and "two lines" in goaf. In order to reduce the gas concentration in the goaf, the high gas mine carries out the high drainage roadway and the special roadway of gas drainage to drain the gas from the goaf, which increases the air leakage in the goaf. Therefore, it is the key to prevent and extinguish spontaneous combustion in fully mechanized caving caving area. Based on the research background of 15109 face of Huang Yan Hui Coal Mine, this paper starts from the characteristics of spontaneous combustion of floating coal in fully mechanized caving area under the condition of high gas drainage. Numerical simulation of the air leakage field and oxygen concentration distribution in the goaf under the condition of high drainage roadway and special gas drainage roadway is carried out. Firstly, in the present coal spontaneous combustion mechanism, seepage mechanics. On the basis of prediction of spontaneous combustion, judgement of spontaneous combustion danger area and numerical simulation, the related characteristic parameters of spontaneous combustion of coal seam are measured by experimental simulation, and relevant subject knowledge is utilized. The prediction model of gas seepage in fully mechanized caving goaf under the condition of high drainage roadway and special roadway for gas drainage is established, and the numerical simulation calculation is carried out. By changing the negative pressure of high extraction roadway to study its influence on the "three zones" of goaf. Finally, according to the actual field observation. Under the condition of high drainage roadway and special roadway for gas drainage, the danger area of spontaneous combustion of goaf in fully mechanized caving caving is divided statically. The reliability and accuracy of the established mathematical model are verified. The results of the study are of great significance to guide the prevention and control of coal spontaneous combustion in the goaf of the same type of mines.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TD75

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