2019 Volume 75 Issue 1 Pages 49-61
Recently, there is a possibility that vibration problems in areas near railways arise because of hastening of trains. When considering countermeasures against ground vibration, one must assess the frequency properties of the ground vibration and choose countermeasures that can reduce the vibration effectively in the predominant frequency band. In earlier studies, theoretical considerations and FEM analyses have demonstrated the vibration reduction effects using vibration-isolating groove or wall. However, we have insufficient knowledge to elucidate the mechanisms of wave propagation considering a vibration-isolating wall. Choosing a wall material with strong ground vibration reduction effects is also difficult. Therefore, we conducted model tests to assess countermeasures against ground vibration induced by a bullet train (Shinkansen). Experiment results showed that a vibration-isolating wall had stronger ground vibration reduction effects than countermeasures using weights located on the ground surface. Moreover, to display stronger ground vibration isolation effects, the rigid wall should be extended to the small ground vibration place without dividing small segments.