發(fā)布時間：2018-05-24 17:54

  本文選題：覆巖空間結構 + 巖層運動��； 參考：《河北工程大學》2015年碩士論文

【摘要】：伴隨著淺部煤炭資源的日益殆盡,深部煤炭開采已成為新時期我國能源保障的重要手段。根據(jù)有關資料顯示,我國已經(jīng)探明的深度在1000米以下的煤炭儲量達到2.95萬億噸,占煤炭資源總量的53%。但隨著煤炭開采深度的不斷增加,采場圍巖的力學特性也逐漸發(fā)生了改變,不僅頂板管理越發(fā)困難,沖擊地壓發(fā)生的可能也越來越高,這使得煤炭開采遭受動力災害的可能越來越大,以地應力為主導的沖擊地壓事故的防治難度在加大。進入深部開采后,決定礦山壓力顯現(xiàn)程度的運動巖層在厚度和層面方向上已經(jīng)超出傳統(tǒng)的平面模型范圍,所形成的覆巖空間結構的運動影響著采動應力場的分布。本論文重點進行深部復雜條件開采煤巖采動災害機理及危險性多因素耦合致災機理方法的研究,針對邊界條件為兩面采空區(qū)和三面采空區(qū)(孤島工作面)采場巖層運動規(guī)律,結合數(shù)值模擬分析,揭示深部開采煤層覆巖采動階段多因素耦合災變機理。首先從宏觀角度分析,通過地質條件和開采因素對工作面沖擊危險性的影響,確定出工作面在推進過程中可能會發(fā)生沖擊地壓的區(qū)域。然后運用多因素耦合致災機理的研究方法,通過對工作面煤巖結構、地質構造、覆巖空間結構的運動等因素的分析,對每一因素單獨分析,劃出危險區(qū)域,最后通過危險區(qū)域可以看到有重疊部分,這些重疊部分危險程度更大,以此,區(qū)分危險程度的不同,劃分出不同區(qū)域。結合工程實例,利用微地震監(jiān)測結果和力學結果驗證采動階段應力場時空分布規(guī)律及多因素耦合致災機理。
[Abstract]:With the increasing depletion of shallow coal resources, deep coal mining has become an important means of energy security in China in the new period. According to the relevant data, the proven coal reserves below 1000 meters have reached 2.95 trillion tons, accounting for 53% of the total coal resources. However, with the increasing of coal mining depth, the mechanical properties of surrounding rock of stope have gradually changed, not only the roof management is more difficult, but also the possibility of impact ground pressure is higher and higher. As a result, it is more and more likely that coal mining will suffer from dynamic disasters, and it is becoming more difficult to prevent and cure ground burst accidents which are dominated by in-situ stress. After entering deep mining, the thickness and direction of the moving rock layer which determines the degree of mine pressure appearance has exceeded the traditional plane model, and the movement of the overburden spatial structure affects the distribution of the mining stress field. This paper focuses on the study of mining disaster mechanism and hazard multi-factor coupling disaster mechanism of mining rock in complex conditions of deep mining, aiming at the movement law of stope strata in two-face goaf and three-sided goaf (Gudao face) with boundary condition. Combined with numerical simulation analysis, the coupling disaster mechanism of multiple factors in mining stage of overburden rock in deep mining seam is revealed. Firstly, from the macroscopic point of view, through the influence of geological conditions and mining factors on the impact risk of the working face, the area where the impact ground pressure may occur in the working face during the process of propulsion is determined. Then, by using the method of multi-factor coupling mechanism research, through the analysis of coal and rock structure, geological structure, movement of overburden space structure and so on, each factor is separately analyzed, and the dangerous area is delineated. Finally, we can see that there are overlapped parts through the dangerous areas, which are more dangerous. By this way, we can distinguish the different degree of danger and divide the different regions. Combined with engineering examples, microseismic monitoring results and mechanical results are used to verify the temporal and spatial distribution of stress field in mining stage and the mechanism of coupling disaster caused by multiple factors.
【學位授予單位】：河北工程大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TD324

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本文編號：1930002