摘要
讨论了局部通风机运转状况、通风设施损坏与采掘工作面瓦斯浓度的变化关系及对矿井安全生产的危害，同时就通风巷道失修。
Auxilary fan runing condition,changable relation between ventilation equipment damage and gas concentration in the mining and heading face as well as its harm to the safty production along with the economic loss caused bad repairing for heading face including ventilation equipment air leak are all discussed in detail.
