| 초록 |
This paper reports a result of roadside landslide disasters along national highways from the year 1996 to the year 2004, and we describe that a roadside landslide hazard map is useful to prevent highways from disasters. Ministry of Land, Infrastructure and Transport (MLIT) encountered 477 landside disasters with road traffic closures on national highways in the past fifteen years after the campaign. We divided 477 disasters into groups by both of evaluation ranks and disaster types. It results that half of disasters occurred at non-predictive sites in the former road facility inspection campaign of MLIT. In order to solve these problems, we applied a roadside landslide hazard map to a road in a mountain. The hazard map shows weakness in heavy rainfall and countermeasure on roadside at a glance. The hazard map integrated results of road facility comprehensive inspection, daily patrol and disaster records into a map at a scale of 1:5,000. Weakness is a causative factor of landslides such as such as rock-fall, slope failure, rock-mass failure, debris flows, and so on. These were recognized as geographical features by air-photo interpretation. In the other hand, countermeasure shows roadside slope stability. These countermeasures are divided into three ranks on a guideline of road facility comprehensive inspection in 1996. It resulted that our hazard map newly picked up 8 slopes along the highway. The map was useful to evaluate risks to a highway effectively. |
