Abstract
This paper reports a case study of vibration mitigation by WIB measures for road traffic. The Wave Impeding Barrier (WIB) employs a performance design for claimed vibration levels in view of vibration regulations and specification. The field measurements of vibrations at the site indicate Lmax of 64 dB in average, and 70 dB of the maximum. The predominant frequencies exist in the range of 12 Hz ～ 16 Hz. This situation claims 10 dB for reduction in order to improve the vibration environment to the comfortable 55 dB. The WIB measures, basically of honeycomb shaped cells but deformed geometrically, or substituted by macadam compaction in the area of buried pipes exist, are constructed by soil piles made of the cement mixing method. The vibration measurement after WIB construction proved that the Lmax is reduced by 13 dB for maximum and 10 dB in average.
