A study on the development of subsurface cavity potential map in Fukuoka city

Abstract

Subsurface cavities have to be treated properly because cavities can cause road subsidence and become a sinkhole. In this study, data of subsurface cavities obtained in Fukuoka city were analyzed considering geographic or environmental factors to establish the correlation using GIS. According to the correlation and weighting among factors, a cavity potential value, which shows how each place is likely to have cavity was defined and calculated. The aim of this study is to develop a cavity potential map using the cavity potential values calculated at each grid （250m×250m）. In addition, dimensions of target cavities were sorted out to grasp the image of the target cavities.