房屋裂缝是否由煤矿采煤引起，主要是看采空区是否进入村庄保安煤柱。
If the mined zone go into the security coal pillar, the house crack could be thought caused by mining.
房屋裂缝是否由煤矿采煤引起，主要是看采空区是否进入村庄保安煤柱。
The cause of house crack determined by security coal pillar of village.
判定15 m保安煤柱的屈服和孤岛煤体的破坏是发生动力灾害的重要因素。
The main causes of the dynamic disasters were identified as the yield of the 15 m security coal pillar, and the excavation in an "isolated island" coal mass.
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