PROPOSAL OF A POROUS HOOD FOR A HIGH-SPEED RAILWAY TUNNEL BASED ON AN EVALUATION Of A MICRO-PRESSURE WAVE

Abstract

 We propose a porous hood for a high-speed railway tunnel to reduce a micro-pressure wave. This proposal is based on a prediction method of a micro-pressure wave, which simulates pressure wave generation by a train entering into a hooded tunnel and its propagation along a tunnel and then evaluates the discharge of a micro-pressure wave from an exit of a hooded tunnel. The predicted results agree well with field measurement data. By using this prediction method, we study the effects of a porous aperture ratio and the length of a porous hood on the strength of a micro-pressure wave and find their critical values to fulfill the requirement of a micro-pressure wave strength. These parameters are then adjusted under the constrains of the noise emission from the porous hood and the construction cost of a porous hood. Finally, we present a standard configuration of a porous hood for a high-speed railway.