关键词: 近距离煤层群, 卸压开采, 采动应力演化, 不规则矿柱, 相似模拟试验

Abstract: According to the geological and mining technical conditions of the seams No.8 and No.6 of closed coal seams group in Paner deep coal mine, the 2D similar material simulation model of seams No.8 and No.6 is designed by using relieving mining method from up to down to study high stress evolution. Based on mining-induced stress monitoring by using pressure sensor, disturbance stress and strata migration after seams No.8 and No.6 mined; and the impact of irregular pillar on stress evolution are systematically analyzed; then the high stress evolution characteristics in roof and floor of seam No.8 and strata movement, mining-induced stress, mining-induced fissure, weighing characteristic of seam No.6 are were obtained; and the development patterns of mining-induced stress and mining-induced fissure influenced by irregular pillar are obtained. Research results not only provide a theoretical basis for mining power disaster prevention with mining-induced abutment stress evolution as its leading factor, but also provide technical support for the design and optimization of parameters of longwall mining by using relieving mining method.

Key words: multi-closed coal seams, relieving mining, mining-induced stress development, irregular pillar, material simulation experiment