许楼煤矿在主井人工冻结巨厚砾岩段施工中，采用了控制爆破技术。
A controlled blasting technology was applied to the construction of freezing thick gravel stratum section in the main shaft of Xulou Mine.
许楼煤矿在主井人工冻结巨厚砾岩段施工中，采用了控制爆破技术。
A controlled blasting technology was applied to the construction of freezing thick gravel stratum section in the main shaft of Xulou Mine.
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