トンネル入口緩衝工の断面積の効果に関する模型実験

抄録

The tunnel hood is one of the countermeasures for reducing the micro-pressure waves emitted from high-speed railway tunnels. The experiments using the axisymmetric models were conducted for investigating the effect of the conventional vented hood and the cross-sectional area of the unvented hoods. The ratios of the cross-sectional area of the unvented hoods to that of the tunnel were set to 1, 1.4, 2, 2.5, and 3. The results show that the optimum ratio of the cross-sectional area of the unvented hood is 2.5, and the effect of the unvented hood of the optimum crosssectional area with the length of 30 m is equivalent to that of the vented hood of the length of 50 m in the case where the train nose length and its speed are 15 m and 360 km/h, respectively.