The results showed that the integrality of the coal pillar would be one of the main reasons to cause the ventilationleakage and the left coal spontaneous combustion.
结果表明：煤柱完整性是导致采空区漏风、遗煤自燃的主要原因之一。
2
Retrograde ventilation is used for Wangjiazhai coal mine, both air leakage and ventilation resistance of the main shaft are largish.
王家寨煤矿为中央并列式通风，漏风量较大，主井通风阻力较大。
3
The means of sealing by nitrogen aerating and local forced ventilation are used for the leakage source points so as to reduce the explosion class in the gas zones.