Study on Seismic Performance Evaluation of Road Embankment Along the Coast
- Kentaro Kuribayashi (Seismic engineering and facility maintenance division) | Tadashi Hara (Kochi University) | Shuichi Kuroda (Seismic engineering and facility maintenance division)
- Document ID
- International Society of Offshore and Polar Engineers
- The 28th International Ocean and Polar Engineering Conference, 10-15 June, Sapporo, Japan
- Publication Date
- Document Type
- Conference Paper
- 2018. International Society of Offshore and Polar Engineers
- reinforced soil wall, Road embankment, tsunami, damage investigation, seismic performance design, water tank test
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- 12 since 2007
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On the 2011 off the pacific coast of Tohoku earthquake, many of road embankments along the coast were less damaged. Following this, a lot of municipalities along the coast adopt a road embankment as a countermeasure against tsunami in Japan. This paper aims to make clear the performance requirements for road embankments in coastal areas. First, we reviewed damage examples of road embankment in the earthquakes, and we focus on two topics. The first concerns the settlement of road embankment. We introduce our field survey to measure the settlement of road embankment behind bridges in Mashiki town, where is damaged by 2016 Kumamoto earthquake. And we propose a performance index of settlement of the road. The next concerns the performance of the reinforced soil wall against tsunami. Here we introduce our water tank experiment to verify tsunami-resistant performance of the reinforced soil wall. Our experimental results showed that reinforced soil wall has high stability against tsunami if there no gap of front panels. From these results, we confirmed that it is important to determine the tolerance level to settlement of embankment even when we perform the capacity design of road embankment along the coast.
The 2011 off the pacific coast of Tohoku earthquake (Mw=9.0) caused great damage of geotechnical structures in the vicinity of the eastern coasts. In contrast, many of road embankments along the coast, which is less damaged by the earthquake, prevented the tsunami and protected a lot of people against tsunami. Following this, a lot of municipalities along the coast adopt a road embankment as a countermeasure against tsunami in Japan. In recent years analytical technique of the road embankment structure was improved, and it became easier to estimate the deformation of the embankment in the earthquake. For these backgrounds, a performance design was adopted for the road embankment in Japan, and checking for the deformation of the embankment came to be conducted. However, there is no defined criterion about the performance of the road embankment required in earthquake, particularly the allowable deformation.
|File Size||3 MB||Number of Pages||7|