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在采矿场开采中,由于回采时间长,空区充填的不严实,造成顶板下沉,上盘压力增大,使采场间柱受压大,有的采场没有回采完毕就造成间柱爆裂,顺路天井上下人员受到威胁,为了生产安全,以前将天井用木材支护,间柱用木板包起来。可是时间一长矿柱爆裂扩大,使顺路天井断面缩小,有的缩小到难以行人的地步,迫使采场停采,造成
In the mining field mining, due to the long recovery time, the filling of the empty area is not tight, resulting in the roof sinking, the pressure on the plate increases, so that the pressure of the stope between stopes is large. , Down the stairs from top to bottom under the menace, in order to produce safety, the former courtyard with timber support, between columns wrapped with wood. However, over time, the explosion of the ore column expanded so that the cross-section of the on-street pavement was narrowed, and some narrowed to the point where it was difficult for pedestrians to force the stope to stop mining, resulting in