A study on tunnel cross-section design for the Honam high speed railway Unlike a conventional railway system, a high-speed rail system experiences various aerodynamic problems in tunnel sections. Trains running at a high speed in a small tunnel, compared with the open field, face significant air pressure, resulting in reduced operating stability and fast change in pressure inside the tunnel. These phenomena further cause some unexpected problems such as the onboard passenger s aural discomfort and an impulsive noise at the tunnel exit. Therefore, the cross-section design of high speed railway tunnels must consider aerodynamic prob-
lems (aural discomfort and micro-pressure) as well as general railway requirements such as clearance and space for catenary, signaling, and telecommunication facilities However, compare with other countries, tunnel cross-section of Kyungbu HSR has bigger clearance than need. A bigger tunnel cross-section is better for safe train operation and passenger s comfort. But it requires a relatively high construction cost. Therefore, in the Honam HSR to be newly constructed, it will be desirable to seek cost reduction by reducing the tunnel cross-section to the extent possible. And then, in this paper, the optimum cross-section design that can satisfy impulsive noise, aural discomfort and disaster prevention was reviewed. www.yooshin.co.kr
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