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以榆神矿区大保当普查区为研究区,分析了区域地质条件和典型钻孔数据资料,针对该矿区主采煤层构建了不同岩土比类型的数值模型,运用数值模拟实验的方法研究在地质条件和开采工艺相同的情况下,覆岩岩土比对开采沉陷的影响规律。结果表明:在不同的埋深水平下,下沉系数都会随着岩土比的增大而减小,且变化趋势有所不同;随着岩土比的增大,采高对下沉系数的影响程度呈现先增大后减小的变化趋势,一般当岩土比为4∶1~8∶1时,采高的变化对下沉系数的影响程度最大;基于数值模拟实验结果,发现超过100 m的巨厚土层具有降低下沉系数的效应。
Taking the Dabao Dang census area of Yushen mining area as the research area, the regional geological conditions and typical borehole data are analyzed. Based on the main coal seams in this area, different numerical models of different types of geotechnical ratios are constructed. The numerical simulation experiment is used to study In the case of the same geological conditions and mining technology, overburden rock to mining subsidence law. The results show that under different burial depths, the subsidence coefficient will decrease with the increase of geotechnical ratio, and the variation trend will be different. With the increase of geotechnical ratio, the subduction coefficient The influence degree firstly increases and then decreases. Generally, when the ratio of rock to soil is 4: 1 ~ 8: 1, the change of mining height has the greatest influence on the subsidence coefficient. Based on the numerical simulation results, it is found that over 100 The huge thickness of m has the effect of reducing the subsidence coefficient.