Research on Ventilation Layout in Jet-Flow Gallery Ventilation System in a Twin-Tunnel Construction

The emergence of the jet-flow gallery ventilation system partially solves the ventilation problem during the construction period of a long tunnel. When employing this system, if ventilation arrangement is unreasonable, contaminated air reversal will likely to occur, which will lead to a hazardous environment in the working area of the tunnel. In this paper, based on numerical simulation research, the velocity distribution in the tunnel was investigated. The distance between the main ventilator and the transverse gallery, velocity in tunnel face, velocity in circulating are studied. Through the research, it has been found that as the distance between the main ventilator and the transverse gallery increases, the velocity in circulating is enhanced, and the velocity in tunnel face decreases, as the reverse flow of the contaminated air will be controlled.