本文選題：煤層采掘過程 + 結(jié)構(gòu)變形��； 參考：《山東科技大學(xué)》2017年碩士論文

【摘要】：煤層采掘過程容易引發(fā)煤與瓦斯突出等嚴(yán)重自然災(zāi)害。在前人研究成就基礎(chǔ)上,本文深入研究了煤層采掘過程中的煤體結(jié)構(gòu)變形與煤層瓦斯流動(dòng)間的耦合特征,這對于正確掌握煤層采掘過程可能引發(fā)的瓦斯突出規(guī)律,對于減少、預(yù)測和防治瓦斯災(zāi)害事故等,均具有重要意義。本文首先簡述了煤層采掘過程引發(fā)的煤體結(jié)構(gòu)變形特征以及瓦斯在變形煤體內(nèi)的滲流流動(dòng)特征;在此基礎(chǔ)上,建立了煤體結(jié)構(gòu)變形應(yīng)力場與瓦斯流動(dòng)滲流場之間的多場耦合數(shù)學(xué)模型;利用大型仿真模擬軟件,模擬得出了煤層采掘過程中煤體結(jié)構(gòu)應(yīng)力場、瓦斯流動(dòng)滲流場相互耦合的煤體應(yīng)力、瓦斯壓力、位移與瓦斯流速的分布特征與分布規(guī)律。最后,利用模型算例進(jìn)行了驗(yàn)證分析。算例驗(yàn)證結(jié)果表明,本文所建立的多物場耦合模型是合理的,模擬計(jì)算結(jié)果與現(xiàn)場實(shí)際情況符合程度高,結(jié)果具有滿意的可信度。本文第4章的煤層采掘過程細(xì)觀瓦斯流動(dòng)多物場耦合模擬結(jié)果表明:(1)在煤巷掘進(jìn)過程中的不同時(shí)段,煤體結(jié)構(gòu)變形的應(yīng)力值先是在巷幫兩側(cè)出現(xiàn)了具有對稱特征的卸壓低壓區(qū),兩側(cè)向里則相似呈現(xiàn)應(yīng)力集中峰值,然后垂向應(yīng)力逐漸隨距煤壁距離的增大而減小,并在煤層深部趨于穩(wěn)定;(2)瓦斯壓力則可受到煤層初始瓦斯壓力、煤層滲透率、煤體變形應(yīng)力的共同作用與影響,且隨距煤壁的距離呈現(xiàn)非線性分布,并最終在煤層深部趨于穩(wěn)定;(3)瓦斯?jié)B流速度隨距離采掘面距離的變化而變化,且同一點(diǎn)的流速在不同時(shí)刻又受地應(yīng)力、瓦斯壓力的顯著耦合影響。本文第5章的算例模擬分析結(jié)果表明:(1)煤層掘進(jìn)工作面開采位置延伸后,由于應(yīng)力狀態(tài)不同和透氣性的差異,初采切眼附近的瓦斯壓力降低很快;隨著工作面的延伸,瓦斯壓力呈動(dòng)態(tài)變化,最后趨于一個(gè)固定值。(2)煤層初采切眼附近的瓦斯壓力梯度,在切眼周圍存在明顯的瓦斯壓力梯度分布,且隨煤層的開采、瓦斯的卸壓,其瓦斯壓力梯度分布范圍逐漸擴(kuò)大。(3)本算例的驗(yàn)證結(jié)果表明,本文所建立的多物場耦合模型是合理的,模擬計(jì)算結(jié)果與現(xiàn)場實(shí)際情況符合、結(jié)論可信。
[Abstract]:Coal seam excavation process is prone to lead to coal and gas outburst and other serious natural disasters. On the basis of previous research achievements, this paper deeply studies the coupling characteristics between coal structure deformation and coal seam gas flow in the process of coal seam mining, which is helpful to correctly grasp the law of gas outburst that may be caused by coal seam mining process, and to reduce the gas outburst in coal seam mining process. It is of great significance to predict and prevent gas disasters and accidents. In this paper, the characteristics of coal structure deformation caused by coal seam excavation and the seepage flow characteristics of gas in the deformed coal body are briefly introduced, and on this basis, The coupling mathematical model between the deformation stress field of coal structure and the seepage field of gas flow is established, and the stress field of coal structure in the process of coal seam mining is simulated by using large-scale simulation software. The distribution characteristics and law of coal body stress, gas pressure, displacement and gas velocity of gas flow seepage field. Finally, a model example is used to verify and analyze the model. The simulation results show that the coupling model is reasonable, and the simulation results are in good agreement with the actual situation, and the results have satisfactory reliability. In chapter 4 of this paper, the simulation results of mesoscopic gas flow and multi-field coupling in coal seam mining show that the stress value of coal structure deformation first appears symmetrical pressure relief low pressure area on both sides of roadway in different period of time during coal roadway tunneling. The vertical stress decreases gradually with the increase of the distance from the coal wall, and tends to stabilize at the depth of the coal seam. The gas pressure can be subjected to the initial gas pressure of the coal seam and the permeability of the coal seam. The coaction and influence of deformation stress of coal body show nonlinear distribution with the distance from coal wall, and finally tend to stabilize in the deep coal seam) the velocity of gas seepage varies with the distance of mining face. The velocity at the same point is influenced by the coupling of ground stress and gas pressure at different time. The simulation results of the fifth chapter of this paper show that the gas pressure near the initial cut decreases rapidly due to the difference of stress state and gas permeability after the mining position extension of the coal seam driving face, and with the extension of the coal face, The gas pressure changes dynamically and tends to be a fixed value. Finally, the gas pressure gradient near the initial cut hole in the coal seam tends to be a fixed value. There is obvious gas pressure gradient distribution around the cut hole, and with the coal seam mining, the gas pressure is released. The verification result of this example shows that the coupling model of multi-matter field established in this paper is reasonable, and the simulation results are consistent with the actual situation and the conclusion is credible.
【學(xué)位授予單位】：山東科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TD712

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