煌斑岩遇水对特厚煤层覆岩运移的影响数值模拟研究

    Numerical Simulation Study on Effect of Lamprophyre in Water on Overburden Migration in Ultra-thick Coal Seam

    • 摘要: 为了研究侵入特厚煤层顶板不同层位的煌斑岩在遇水前后对采场覆岩运移产生的影响,以大同塔山矿为背景,通过建立UDEC数值模拟模型,对煌斑岩遇水前后特厚煤层采场覆岩垮落、破坏和顶板下沉特征进行了研究。研究表明:遇水情况下,煌斑岩侵入煤层顶部时,顶板初次垮落步距减小并呈缓慢下沉特征;侵入直接顶中部时,上部直接顶岩层随下部直接顶一起垮落,且垮落步距明显缩短;不同层位的煌斑岩无论是否遇水,只对初采阶段直接顶岩层活动规律有直接影响,高位岩层主要受基本顶控制。

       

      Abstract: In order to study the influence of lamprophyres intruding into different strata of roof of extra-thick coal seam on overlying rock migration before and after encountering water, a numerical simulation model of UDEC is established based on Datong Tashan Mine. The characteristics of overburden collapse failure and roof subsidence before and after the lamprophyre meets water are studied. The research shows that when lamprophyre intrudes into the top of coal seam in the case of water, the first collapse step distance of roof decreases and shows the characteristics of slow subsidence; when lamprophyre intrudes into the middle part of the direct roof, the upper direct roof strata collapse together with the lower direct roof, and the collapse step distance is obviously shortened; lamprophyres of different strata, whether they meet with water or not, only have direct influence on the activity rules of the direct roof strata in the initial mining stage, and the upper strata are mainly controlled by the basic roof.

       

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