【摘要】：我國(guó)人口眾多，煤炭需求量大，能源相對(duì)緊張，最大限度地提高煤炭資源回采率，成為了當(dāng)前迫切的任務(wù)。而合理地縮小防水煤柱，提高煤層的開采上限,可解放大量呆滯煤量，提高資源回收率，對(duì)煤礦生產(chǎn)具有重大意義。 導(dǎo)水裂隙帶發(fā)育高度是影響提高開采上限的主要因素之一。通常長(zhǎng)壁工作面開采后，，頂板一般將破斷并垮落。工作面的空間有限，在深數(shù)百米到上千米的地下，工作面的開挖只有數(shù)米。正是因?yàn)榭臻g的有限，決定了破壞的有限性。為進(jìn)一步研究不同采高的裂隙高度發(fā)育規(guī)律，提高開采上限，采用數(shù)值模擬進(jìn)行計(jì)算比較。 本文以岱莊煤礦43下20工作面為例，在分析工作面水文地質(zhì)特征的基礎(chǔ)上，采用FLAC3D軟件開展提高開采上限數(shù)值模擬分析，研究了工作面覆巖破壞規(guī)律,并確定導(dǎo)水裂隙帶發(fā)育高度。模擬結(jié)果表明：3上煤層開采以后最大導(dǎo)水裂隙帶發(fā)育高度為21m左右，之后3下煤層的4321工作面開采，再采掘43下20工作面，其上部邊界塑性區(qū)的發(fā)育的最高達(dá)到35m，上部仍有約為23m的底部粘土隔水層。最后結(jié)合水文地質(zhì)及工程地質(zhì)條件進(jìn)行綜合評(píng)定，對(duì)工作面局部提高開采上限進(jìn)行可行性論證，證明了43下20工作面提高開采上限是可行的，為設(shè)計(jì)防水煤巖柱提供了參考依據(jù)。
[Abstract]:China has a large population, large demand for coal and relatively tight energy. It is an urgent task to improve the recovery rate of coal resources to the maximum extent. The reasonable reduction of waterproof coal pillar and raising the upper limit of coal mining can liberate a large amount of stagnant coal and increase the recovery rate of resources, which is of great significance to the production of coal mine. The development height of water-conducting fissure zone is one of the main factors affecting the increase of mining upper limit. Usually long-wall face mining, roof will generally break and collapse. Face space is limited, in the depth of hundreds of meters to thousands of meters underground, the face excavation only a few meters. It is because of the limited space that determines the finiteness of destruction. In order to further study the law of fracture height development of different mining heights and raise the upper limit of mining, numerical simulation was used to calculate and compare. In this paper, based on the analysis of the hydrogeological characteristics of the working face, a numerical simulation analysis of raising the upper limit of mining is carried out by using FLAC3D software, and the failure law of overburden rock in the working face is studied by taking the 43 lower 20 working face of Daizhuang Coal Mine as an example. The height of the fracture zone is determined. The simulation results show that: (3) the development height of the maximum water conductivity fissure zone is about 21 m after the mining of upper coal seam, and the maximum development of plastic zone in the upper boundary is 35 m after mining at 4321 working face of 3 lower coal seam and 20 working faces in 43 lower coal seams. In the upper part, there is still a clay barrier at the bottom of about 23 m. Finally, combined with hydrogeological and engineering geological conditions, the feasibility of raising mining upper limit is demonstrated, and it is proved that it is feasible to raise mining upper limit in 43 lower 20 working face. It provides a reference for the design of waterproof coal pillar.
【學(xué)位授予單位】：華北科技學(xué)院
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TD823

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