In this study, we at tempted to develop methods of evaluating and predicting the risk of failure of rock beds and slopes facing roads in order to improve the efficiency of road disaster management under the limited funds and man power.


Some areas of Japan face severe topographical and climatic conditions. Therefore, counter measures against natural disasters to ensure safe and reliable conditions throughout the country are indispensable for providing stability to people–s lives and ensuring the sustainable growth of the economy. Roads are a basic social infrastructure, however due to topographical reasons, are often constructed in close proximity to unstable rock beds and slopes that are vulnerable to collapses and failures. Road administrators have implemented disaster prevention measures against failures of rocks and slopes, but more than 100,000 sites still require such disaster prevention measures or management system based on daily inspection. There had been a resistance to active implementation of the concept of risk management in the field of disaster prevention managed by public sector. The reason for this was that administrators were apprehensive about being held responsible for any risk in the facilities controlled by the government, such as roads an driver levees, by disc losing the risk to the public. There is a possibility that the occurrence of negative events is has tally connected to administration errors, as is pointed out by Okada and Kobayashi (1993). However, in order to undertake more effective and efficient road disaster management under the limited funds and manpower, it is necessary to develop the risk evaluation and management technologies that can clarify the effects of disaster prevention investment and improve public accountability. This study therefore attempts to develop methods of evaluating and quantifying the risk of failure of rock beds and slopes in road disaster management.

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