STUDY ON CONDITION RATING PROCEDURE OF ASHLAR RETAINING WALL AND LEANING TYPE RETAINING WALL BASED ON VIBRATION CHARACTERISTICS

Abstract

 In Japan, condition rating of retaining structures has been done based on visual inspection by following the maintenance standards. In this study, applicability of the percussion test for the condition rating of retaining structures is examined by conducting a series of prototype scale model tests and percussion tests at the site. It was found from these tests that the vibration characteristic of deformed retaining wall was different from the sound retaining wall; large Fourier's amplitude of the spectrum was exhibited especially at low frequency range. Two indexes, these are Spectrum area (SA) and Spectrum score (SS), are proposed to evaluate the change of the vibration characteristics of the deformed retaining wall. Relevant analyses on formerly conducted percussion tests results and prototype scale model test revealed that the proposed indexes could work well to distinguish the deformed retaining wall from the sound ones.