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在深部水平采煤时用煤柱护巷变得愈来愈不合理:煤炭资源损失增加;在煤柱影响区内邻近煤层的瓦斯活动和采面及巷道垮落的危险性增大;煤炭运输复杂化;沼气从留设的煤柱中逸出致使采区瓦斯涌出量增大。 当用长壁法采煤时,护巷煤柱的损失特别大。例如,在顿巴斯煤田红军矿区的某些矿井中,几乎百分之百的煤炭都是用长壁法采出来的,当采深在600米以内时,护巷煤柱尺寸为45米。采深在600米以上时,护巷煤柱尺寸达60米。留设这样的柱煤,是为了排除或减少(即使减少一
In the deep level of coal mining with coal pillar protection becomes more and more unreasonable: the loss of coal resources increased; adjacent coal seams in the coal pillar in the gas activity and caving and roadway collapse risk increased; coal transportation Complicated; methane escape from the remaining pillars led to increase the amount of gas emission mining area. When using the longwall coal mining, roadway pillars loss is particularly large. For example, nearly 100% of some mines in the Red Army mine in the Donbass Coalfield are mined by the longwall method, and when the depth of cut is within 600 meters, the coal pillar size is 45 meters. Mining depth of 600 meters or more, the roadway pillar size of 60 meters. To leave such a column of coal, is to exclude or reduce (even if the reduction of one