Development of CounterVibration Measure by Tire Fill-in WIB Method

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This study aimed first at revealing the vibration transmission mechanism from the train to nearby ground, and then at developing effective vibration counter measure called honeycomb WIB with tire fill-in based on the former knowledge. The following works have been conducted. :(1) Development of the computer simulation system for predicting the vibrations induced by train and trafficThe dynamic analysis for a track and ground system is investigated with due consideration of the moving load effect. The 2.5 dimensional solution method is taken for the effective and efficient procedure. The fundamental design formula of a honeycomb wave impeding barrier (WIB) is developed based on the knowledge of the wave field.(2) Field measurementsFrom the vibration measurement along a train track, the vibration transmission from train track through the ground was observed. The theoretical interpretation is made based on the data. The structural borne vibration and the ground borne vibration are then detected in comparison with the structural natural frequencies and the wave dispersion characteristic of the ground at site.(3) Field experimentThe dynamics of the tire fill-in WIB are investigated by the impact loading and harmonic loading. The vibration reduction of this measure is evaluated when it is constructed in the vicinity of a pile foundation. The results are also compared with the computer simulation.