Shin-Sakuramachi Tunnel, 1.972km long road tunnel, is part of the 3.54km long renovation section of the national highway No.291, which connects Ojiya-shi and Oguni-cho in Niigata Prefecture. The tunnel passes through an old gas field and the emission of flammable gas was expected before starting work.
This paper describes the safety measure for methane gas emission during tunnel excavation based on the authors' observation of the relationship between atmospheric pressure and the amount of gas emission.
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