相邻充填体几乎均发生压坏现象，进路回采安全性差。
Meanwhile, almost all adjacent filling bodies have been damaged with poor mining security.
大间距无底柱由于加大了进路间距，改善了巷道的应力集中状态，提高了回采巷道的稳定性。
Due to the increase in access space, the stress concentration state of roadway is improved and the stability of extraction opening is increased.
武山铜矿南矿带采用上向水平分层进路水砂充填法回采，采场多次发生冒顶、片帮。
The South ore-bearing zone of Wushan copper mine is mined with ascending horizontal slicing hydraulic fill crosscut mining system. Roof falling and rib spalling occurred in any times.
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