Abstract
Gifu University research group has studied on a comprehensive risk-management method for infrastructures. As a first step, this study presents a prototype of the risk-management system of rockfall countermeasures. In the prototype system, Hida area located in Gifu prefecture was selected as a target area. There are more than 3000 slopes in the target area. Value of the risk at each slope was estimated by multiplying the obtained probability and the economic loss. In the evaluation process of rockfall provability, a relative probability was calculated using results of a slope observation based on the logistic regression analysis. Then, the absolute probability of the rockfall was calculated using history data of rockfall occurrence. In a evaluation process of the economic loss, the physical loss, the human loss, the circumvention loss, the emergency medical service loss and the isolated colony loss were taken into consideration. It was confirmed the results obtained in this study are in good agreement with the reality. It is also found the obtained results are useful information to make decision of the rockfall risk-management.
