【摘要】 顶煤的运移与垮落,尤其是内部微观裂隙的扩展,与其直接顶和老顶岩层的活动规律密切相关。张双楼煤矿主采煤层为7煤和9煤,两层煤之间赋存唯一一层厚硬岩层,即9煤层的直接顶也是7煤层的直接底。9煤较硬,其顶煤的可放性和开采方案的选择是其成功应用综放开采技术的关键。采用实验室物理模拟,分析厚硬岩层的破断特征,并根据开采不同布置方式与厚硬岩层的不同断距提出9种上层煤与下层煤不同开采方案,系统分析下层煤顶煤压缩量的变化及其可放性。计算机数值模拟与现场实践表明,7煤与9煤的工作面成交错布置方式,先采7煤后采9煤,一次采全高,最有利于9煤工作面的顶煤冒放,保证9煤综放开采的成功。研究结果可为类似条件下的厚硬煤层推广综放开采工艺提供设计指导。更多还原

【Abstract】 The movement and breakage of top coal,especially its internal micro-fracture extension,are closely related to the movement regularity of its immediate roof and main roof.The hard-and-thick strata acts both as the floor of coal seam No.7 and as the roof of coal seam No.9 in Zhangshuanglou Coal Mine;and coal seam No.9 is also hard.Falling ability of coal seam No.9 and the choice of the mining method is the key to use the fully-mechanized with top-coal caving.Physical simulation is used to analyze the breakage features of the hard-and-thick strata.Nine mining methods are put forward for the upper and the lower coal seams mining;and the corresponding top-coal compressed volume of the lower coal seam is studied.At last,the rational mining method is determined as the staggered layout of coalface in the upper and the lower coal seam,with the upper coal seam is mined first and the lower coal seam is mined with the whole height.The numerical simulation and the field practice prove that the use of the fully-mechanized coalface with top-coal caving in the lower coal seam is successful.Achievements can be rationally used to guide the application of the fully-mechanized coalface with top-coal caving in the lower coal seam in the similar conditions.更多还原