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Focused on a single end granite tunnel, the feasibility of the assessment method of the average permeability of wall rock based on the Darcy's law has been explored in this paper. In according with the Darcy seepage phenomenon of low-pressure driving gas in porous medium, under the pressurized ventilation, the radon concentration can reduce to the level of winter by summer, so as to determine the critical point of pressurization. According to the air volume variation and other data in the tunnel section, the scope of the average permeability of wall rock can be determined. This method is suitable for the rapid assessment of the average permeability of the wall rock around the underground tunnel with complex structure, and can effectively avoid the macroscopic lack of rock mass permeability measured by the traditional laboratory ratio test of rock samples and in-situ water / gas injection in borehole.

Ventilation Method Assessment of the Average Permeability of the Fractured Granite Rock Mass around Tunnel