大柳塔煤矿地表沉陷移动变形规律研究
Study on law of surface subsidence movement and deformation in Daliuta Coal Mine
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摘要: 以大柳塔矿为工程背景，综合运用数值模拟方法、现场资料数据分析，对大柳塔矿地表移动沉陷进行了规律研究。结果表明：由于工作面推进速度的提高，使得煤层上覆岩层的各个层次下沉的速度均得到不同程度的加快，从而使得上覆岩层的相对悬空时间减少，所以导致了地表移动变形的集中；通过对工作面地表现场的实际测量和分析得出了地表下沉的最大速度是430 mm/d，因为地表下沉的速度大，所以从开始下沉到达到下沉的最大值所用时间较短，并且下沉量大，走向观测线上的点Z10的最大下沉量为3.959 m，并且由于下沉地区中心位置的下沉量较大，而且采区四周的下沉量在较小的范围内快速降低，下沉地区的边界十分收敛，从而导致了下沉地区的边缘非常陡峭；地表从开始下沉到接近最大下沉量所用不到6个月的时间，而且稳定时间较长，最后下沉100 mm接近10个月的时间才能达到稳定。Abstract: Taking Daliuta Mine as the engineering background, the law of surface movement and subsidence observation in Daliuta Mine was studied by using numerical simulation method and field data analysis. The numerical simulation analysis shows that the rapid advance of the working face makes the subsidence speed of each layer of the overlying strata of the coal seam faster, the relative suspension time is reduced, and the movement deformation is concentrated. The measured analysis shows that the time from the surface subsidence to the maximum subsidence of 430 mm/d is short, and the subsidence is large. The maximum subsidence at point Z10 on the observation line is 3.959 m. The subsidence at the bottom of the subsidence basin is large, and the subsidence near the boundary of the mining area decreases rapidly. The subsidence basin is extremely steep, and the convergence of the subsidence basin boundary is fast. The time from the surface movement to the maximum subsidence is less than six months, and the stability time is long. Finally, the time from the subsidence of 100 mm to 10 months achieve stability.
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