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根据相似原理,通过相似材料试验,对孤岛煤柱矸石膏体充填开采过程中支承压力分布规律以及采场围岩相互关系进行了研究。结果表明矸石膏体充填并没有改变工作面煤壁前方应力赋存状态,仅仅是改变了应力大小;随着工作面推进,采场形成“煤柱-充填体-煤壁”支承结构共同支护顶板,而充填体对煤柱提供侧向约束作用,既可提高了煤柱的稳定性,又可减小了煤柱的宽度,提高煤炭回收率。
According to the similar principle, through the test of similar material, the distribution law of supporting pressure and the correlation between surrounding rock of stope and gob reservoir were studied. The results show that the filling of the waste rockfill does not change the state of stress in front of the coal wall of the working face and only changes the stress level. With the advancement of the working face, the “stope-filling body-coal wall” supporting structure Support the roof, while the filling body to provide lateral restraint on the coal pillar, can improve the stability of coal pillars, but also reduce the width of pillars and improve coal recovery.