Directed at fire prevention in goaf, the paper proposes a method of injecting nitrogen and controlling nitrogen air to flow direction using fugitive air and controlling air quantity in gob.
Among various kinds of empty space under subgrade, gob in coal mines, is a frequently happened phenomenon in the highway survey, design and construction work.
在高速公路勘察设计和施工过程中，经常会遇到设计路基下方存在各种类型的空洞，如煤矿采空区等。
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A digital simulation is made to the rock pressure distribution of faces with large mining height when crossing gob, which may guide engineering practice.