3号煤层综合机械化放顶煤开采覆岩破坏范围

Overburden failure area of comprehensive mechanized top coal caving mining in No.3 seam

在矿井生产中,覆岩的破坏范围是关系到安全生产的一个非常重要的指标,每个矿井在生产之前都要对煤层开采后的覆岩破坏范围做好提前预判。为分析3煤层放顶煤开采后的覆岩破坏范围,采用数值模拟的方法对采后的冒采比、裂采比和破采比进行了模拟分析。最后得出:冒采比的范围在3.3~3.8,平均值为:3.57;裂采比的范围在4.7~5.8,平均值为:5.16;破采比的范围在8.0~9.4,平均值为:8.73。

The failure scope of overlying rock was a very important index related to safety production in coal mine,, it was necessary for each mine before production to predict the extent of overlying rock damage after coal mining. In order to analyze damage scope of overlying strata after top coal caving in No. 3 coal seam. The yield ratio, split production ratio and broken ratio were simulated and analyzed by means of numerical simulation. The results showed that the range of yield ratio was 3.3~3.8 with 3.57 as average value; the range of split production ratio was 4.7~5.8 with 5.16 as average value; and the range of broken ratio was 8.0~9.4 with 8.73 as average value.