Application of Multiple SASW Technique to Investigate Cavity Existence under Asphalt Pavement

초록

This paper describes an experimental investigation for investigating cavity under the urban asphalt pavement. The cavity may appear in construction process or generate due to spilling of water from broken or old sewage pipes. Multiple SASW is a non-destructive method that uses Rayleigh waves to determine shear velocity (Vs) profile with depth in the soil. The Vs profile can explain homogenous level of the soil. In this study, it was verified that cavities could be checked by investigating shear velocity profile with depth which is produced by multiple SASW technique. A cavity in the soil generates lower shear wave velocity than that of surrounding soil. In this study, a 2D shear velocity profiles obtained by ABAQUS FE analysis and from the multiple SASW tests performed in Yong-in model site are used for verification of cavity in the soil. It was successfully verified that multiple SASW technique be used for investigating cavity in the soil.