2024 年 10 巻 50 号 p. 1877-1882
Soil liquefaction occurring in urban areas may result in road subsidence, settlement and tilt of buildings, and manhole uplifting displacement after a heavy earthquake. The limitation of using the soil liquefaction potential map shows that it cannot provide quantitative information about the above-mentioned disasters. Using an appropriate risk assessment of failure modes may serve as a better reference for decision-making agencies, instead of relying solely on a soil liquefaction hazard map. This paper aims to focus on the types of damage that can occur on road infrastructure with the goal of developing a risk assessment strategy for emergency routes. Based on different levels of road damage, we determine the vulnerability level by considering the degree of impact on rescue operations when a disaster occurs. Furthermore, the hazard level was evaluated by taking into account both the liquefaction potential index and the groundwater level. Vulnerability and hazard levels were combined into a risk matrix to determine risk level. As an example, we will use a segment of emergency routes in order to explain how the road damage risk level affects the rescue response in the event of a disaster. The proposed risk assessment demonstrates promising potential as an intermediate tool for emergency response in practical cases.
