社団法人　物理探査学会
第118回(平成20年度春季)学術講演会

電気比抵抗探査による石灰岩地域の空洞探知

講演要旨(和文) 講演要旨(英文) In this study, we conducted electrical resistivity and resistivity tomography surveys to detect underground cavities of ground subsidence area which is distributed the limestone. Underground cavities are widely present within the limestone bedrock overlain by the alluvial deposits in the karst area where the ground subsidences have occurred in the past. The limestone cavities are mostly filled with groundwater and clays in the field site. Thus, cavities have low electrical resistivity compared to the surrounding host bedrock. The results of the study have shown that the zones of low resistivity correspond to the zones of the cavities identified in the boreholes at the site, and that the geophysical methods used are very effective to detect underground cavities.