Abstract
For the preventive maintenance management of expressway slopes, it is indispensable to accurately, efficiently and economically select high-risk slopes for failure, landslide sites, and dangerous mountain streams due to debris flow, distributed over wide area. The authors have introduced an airborne electromagnetic prospecting which is suitable to shortly detect the resistivity of belt-like ground in a wide area.
In this paper, an overview of the airborne electromagnetic prospecting for the preventive maintenance management was described, together with describing such resistivity presentation methods as the absolute value one, the enhanced value one, and the logarithmic enhanced value one which was newly developed. To select some kinds of hazardous slopes, a chart combining both resistivity presentation methods of the absolute value (high accuracy) and the logarithmic enhanced value (threshold) ones was proposed to classify the ground characteristics, together with verifying the validity and effectiveness. Finally, it was concluded that the proposed technique can be applied to understand the ground characteristics and to select hazardous slopes for the preventive maintenance management of highway slopes.
