下沟煤矿泾河及砂砾岩含水层下综放开采分析

摘要

In order to solve the safety mining issue under the double water body dangers of the Jinghe River in the Jinghe Area of Xiagou Mine and the ultra thick Cretaceous gravel aquifer, the statistic analysis and empirical analogy method were applied to study the overbur- den strata structure features, the failure height of the overburden strata and water prevention coal and rock pillar width. The study results showed that the overburden strata in Xiagou Mine were medium hard and soft type, the mining thickness selected in Jinghe Area was 16 times higher than the estimated height of the water flow crack zone and the thickness of the protective seam selected as three times than the top coal caving thickness was suitable. The thickness of the water prevention coal and rock pillar was set according to 19 times thicker than the mining thickness. The major area could meet the conditions to set the water prevention coal and rock pillars. With the rational de- signed mining thickness, the fully mechanized top coal caving mining under the water body of Jinghe River could be ensured.%为解决下沟煤矿泾河区域地表泾河和巨厚白垩系砂砾岩含水层双重水体威胁下安全采煤的问题,通过采用统计分析、经验类比的方法,研究了泾河区域覆岩结构特征、覆岩破坏高度及防水安全煤岩柱留设宽度。研究结果表明：下沟煤矿覆岩类型为中硬偏软弱类型,泾河区域选择16倍的裂高采高比预计导水裂缝带的高度,保护层厚度按3倍综放开采高度选取是适宜的。得出防水安全煤岩柱厚度按照19倍采高进行留设,大部分区域能够满足留设防水安全煤岩柱的条件,通过设计合理的开采高度,可以满足泾河区域水体下综放开采。