厚松散含水层下特厚煤层综放开采覆岩破坏特征研究

Research on Failure Characteristics of the Overlying Strata of Full-mechanized Caving Mining of the Thick Coal Seam under Thick Unconsolidated Aquifer

根据淮北某矿的地质条件,采用相似模拟、数值模拟、经验公式计算以及现场实测4种方法对厚松散含水层下特厚煤层综放开采时覆岩破坏特征进行了研究,分别得出了覆岩冒落带、裂隙带的发育高度。通过比较发现,相似模拟和数值模拟的结果与现场实测的结果比较接近,但经验公式计算得出的裂隙带高度较小。最终确定厚松散含水层下特厚煤层综放开采冒落带高度为13.5 m,裂隙带高度为68 m,为矿区防塌煤岩柱的留设提供了依据。

In line with the geological situation, methods of analog simulation, numerical simulation, empirical formula and field measurement are adopted to do some research on the failure characteristics of overlying strata during the full-mechanized caving mining of thick coal seam under thick unconsolidated aquifer so as to obtain the height of the caving zone and fissure zone of the overlying strata. According to the contrast results, the results of the analog simulation and numerical simulation are close to the actual measurement data. However, the height value of fissure zone that is calculated by the empirical formula is lower than the actual value. So, 13.5 meters and 68 meters are the hight value of the caving zone and fis- sure zone respectively. The above research results can provide some basises for designing and retaining of collapse prevention coal and rock pillars in mining area.