论文部分内容阅读
针对近距离煤层大采高综放顶煤冒放性这一核心问题,理论分析了近距煤层上位煤层未采、上位煤层已采煤体的损伤力学特性,模拟了2种情况下顶煤体的支承压力分布规律、顶煤体裂隙发育及顶煤体破断特征。研究表明:顶煤体的冒放性可用顶煤体损伤程度表示,与顶煤体的原始裂隙和采动支承压力有关;与上位煤层未采相比,上位煤层开采一方面增加了下位煤层顶煤体的原始裂隙,另一方面加大了下位顶煤体所承受的支承压力,从而提高了顶煤体的冒放性。
In view of the core issue of top coal caving of large coal seam with high mining height in close range coal seam, the damage mechanics characteristics of coal seam without seam mining in upper seam and coal seam in upper seam are theoretically analyzed. The top coal mass The supporting pressure distribution, the development of top coal fractures and the top coal body breaking characteristics. The results show that the top coal can be expressed by the degree of damage of the top coal, which is related to the original fracture of the top coal and the pressure of mining support. Compared with the non-mining of the upper coal seam, the upper coal seam increases the lower coal seam top The original fracture of coal, on the other hand, increases the bearing pressure on the lower top coal so as to improve the roof coal.