Abstract：Research purposes:In this paper，the difference between the gas preventions of the tunnel and coal mining and the standard and main indexes for control of tunnel gas are pointed out and a new method different from the grade repartition of mining gasis presented for the grade repartition of the tunnel gas and application of this method can determine the antiknock device and the gas control management system． With this method，it is easy to operate and guide the design，construction and management．
Research conclusions:The method presented in this paper does not only takes the volume of the gas emission as the standard，but also considers the tunnel condition and the layout pattern of ventilation devices to define the gas grade，so with this method to determine the gas grade，many factors should be considered．
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2012, Vol. 29 
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