350 km/h급 고속철도 터널 미기압파 저감대책

초록

The purpose of present study is to investigate for reducing micro pressure waves generated according to train speeds (240 km/h ~ 380 km/h) through tunnels with countermeasures as followings; the inclined angle 45° of tunnel portals and the hood configuration in tunnel entrance. We developed hoods for tunnel of 0.5km length in the condition of tunnel cross-section area of 107 ㎡ on the slab track. The test facility of the 1/60-scale models for the train-tunnel interactions was developed to investigate the effects of entry portal shapes, hood shapes and airshafts for reducing the micro pressure waves radiating to the surroundings of the tunnel exits. In the operation of our test facility, the speed of train model was achieved up to real speed of 600 km/h. The train model is guided on the one-wire system from air-gun driver to brake part of facility end. This guidance method of train model has low friction on wire and it is good for manufacture of detail nose profiles. Some cases of the experiments were compared with numerical simulations to prove the test facility. The test results show very well agreement with that in terms of the method of characteristic equations.