Use of GPR for Monitoring Expansion Mechanism of Subsurface Cavity

Recently, many road collapse accidents have occurred due to subsurface cavities in the urban areas of Korea. This study is aimed to figure out the expansion of the subsurface cavity and estimate the time of pavement failure with repeated load applications through accelerated pavement testing (APT) and ground penetrating radar (GPR) testing. The different sizes of artificial cavities made by ice cubes were installed at different depths in the full-scale APT testbed. The GPR testing was utilized to monitor the expansion of the subsurface cavity with APT load applications.