Studies on wave impeding block (WIB) procedure for vibration reduction

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This research project first has dealt with the computer simulation of the high-speed train induced ground vibration. The track loading is assumed by a set of harmonio moving function of different frequencies in view of a train geometry (axle distances of a car and connection of cars). Besides, sleeper distances and other vibration factors involved are of essence for the periodicity of alongside vibration so that an inverse analysis is introduced of the measured data for the Shinkansen running. The 2.5 dimensional FEM-BEM method developed by the authors is used for the analysis. Thus simulated ground vibration results in a good prediction for the attenuation of alongside vibration acceleration value (VAL).Next, lineside ground vibrations induced by high-speed trains and the mitigation measure are discussed from the computer simulation. The simulated ground vibration due to a train system of axle loads is interpreted from the knowledge of wave propagation in layered soil. The vibration reduction rate by the proposed X-WIB based on thus obtained information is demonstrated for the wave field before and after the installation.Thirdly, a field construction of a WIB is conduced by a set of soil column construction and the effect of the vibration reduction is measured. The corresponding computer simulation is also carried out in order to validate the aforementioned results for the Shinkansen vibration simulation and the reduction effect by the WIB procedure.