数值模拟分析在提高开采上限研究中的应用

发布时间：2019-02-24 08:52

【摘要】：我国人口众多，煤炭需求量大，能源相对紧张，最大限度地提高煤炭资源回采率，成为了当前迫切的任务。而合理地缩小防水煤柱，提高煤层的开采上限,可解放大量呆滞煤量，提高资源回收率，对煤矿生产具有重大意义。导水裂隙带发育高度是影响提高开采上限的主要因素之一。通常长壁工作面开采后，，顶板一般将破断并垮落。工作面的空间有限，在深数百米到上千米的地下，工作面的开挖只有数米。正是因为空间的有限，决定了破坏的有限性。为进一步研究不同采高的裂隙高度发育规律，提高开采上限，采用数值模拟进行计算比较。本文以岱庄煤矿43下20工作面为例，在分析工作面水文地质特征的基础上，采用FLAC3D软件开展提高开采上限数值模拟分析，研究了工作面覆岩破坏规律,并确定导水裂隙带发育高度。模拟结果表明：3上煤层开采以后最大导水裂隙带发育高度为21m左右，之后3下煤层的4321工作面开采，再采掘43下20工作面，其上部边界塑性区的发育的最高达到35m，上部仍有约为23m的底部粘土隔水层。最后结合水文地质及工程地质条件进行综合评定，对工作面局部提高开采上限进行可行性论证，证明了43下20工作面提高开采上限是可行的，为设计防水煤岩柱提供了参考依据。
[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.
【学位授予单位】：华北科技学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD823

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