入口緩衝工があるトンネル坑口から発生する新幹線騒音の評価

抄録

The noise measured close to a tunnel portal of Shinkansen consists of the noise from the tunnel portal and the noise in open section. The noise from the tunnel portal and the noise in open section make the noise level much higher than the noise level at the points away from the tunnel portal. A model to predict the noise from a tunnel portal has been proposed, which was arranged in combination with road traffic noise prediction model and Shinkansen noise prediction model. However, the model has not been well-validated in Shinkansen noise around tunnel portals. In addition, recently, the propagation of the noise from tunnel portals tends to be more complicated because there is a tunnel entrance hood to reduce micro pressure wave, and the noise is also radiated from the openings on the tunnel entrance hood. In this paper, the results of the sound pressure levels measured around the tunnel portal will be discussed, and the comparison of the measurements with the results obtained with this prediction model will be carried out.