榆树井近距离煤层组“两带”高度研究

Study of YUSHUJING close distance coal seam group“two zones”height

为确定榆树井近距离煤层组"两带"的高度,深入研究开采覆岩破坏规律,并为合理留设露头区安全煤岩柱提供数据依据,本文以榆树井矿区近距离煤层组工作面为例,利用实测对比法、《三下采煤规程》经验公式法和综放开采"两带"公式法,预测了工作面的垮落带和裂隙带高度。结果表明:榆树井煤矿11204工作面垮落带最大高度为8.5m,垮采比5;11204工作面导水裂缝带最大高度为55.58m,按照综合采厚计算裂采比为12.43;近距离厚煤层组下组煤开采时,上层煤的底板破坏范围与下层煤的垮落带发育范围有重合区域,加剧了下层煤垮落带的高度发育。

In order to determine the Yushu well close distance coal seam group ＂ two zones＂ height, in - depth study ot mmmg Overburden failure law and reasonable, leav!ng the outcrop area safety pillars provide data basis, in this paper, Yushu well mine close distance coal seam group working face as an example, using the comparative method, ＂three of coal mining regulations＂ empirical formula method and fully mech- anized top coal caving ＂two zones＂ formula method, forecast the height of caving zone and fractured zone. The results show that： the Yushu well mine 11204 working face caving with a maximum height of 8.5m, caving height ratio 5 ; 11204 working face the largest height fracture zone is 55.58m, according to the comprehensive mining thickness calculation of crack production ratio is 12.43 ; close thick coal seam group mining of lower coal group, the upper coal floor damage scope and lower coal caving zone ranges overlap region, exacerbated by the lower coal caving zone height