Research purposes:Gas explosion is one of the most severe disasters in construction of railway and road tunnels and it can produce the extremely serious consequence． Although the relative norms and regulations have provided the instructions on what parameters should be collected and what kinds of experiments should be done during the geological exploration，but in practice，it still remains vague． So it is necessary to do the further study on it and present the more specific operational requirements．
Research conclusions:The geological exploration should be conducted around the three conditions of having effects on the gas explosion． Based on existing data，the parameters，such as the gas pressure，gas content of per ton of coal，firmness coefficient of coal，initial velocity of gas diffusion and gas concentration under ventilation condition，have to be measured on the working face． At the same time，the necessary deep bore drilling should be conducted to collect the gas in the deep bore and measure the gas content，gas emission volume and gas pressure． The cross － hole uncovering coal formula is used to calculate the gas emission volume in tunnel for grading the gas working zone and gas area． All of these works can provide the parameters for the tunnel design and construction so that the relative measures can be taken．
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