| Project/Area Number |
24651204
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Natural disaster science
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| Research Institution | Hokkaido University |
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Principal Investigator |
ISHIKAWA Tatsuya 北海道大学, 工学(系)研究科(研究院), 教授 (60359479)
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| Co-Investigator(Kenkyū-buntansha) |
KIMURA Ichiro 北海道大学, 大学院工学研究院, 准教授 (60225026)
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2014: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2013: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2012: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
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| Keywords | 土砂災害 / 地盤工学 / 水工水理学 / 防災 / 積雪寒冷地 |
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| Outline of Final Research Achievements |
This research develops an analytical procedure using a phenomenalistic mathematical model for the phase change-dependent geotechnical hazards in snowy cold regions by performing experimental and analytical studies. First, we established a new testing method for model tests on soil grounds subjected to freeze-thaw actions and seepage flow, and revealed that seepage pressure and frost-susceptibility and water retention-permeability characteristics of geomaterials seriously influenced the seepage erosion behavior of freeze-thawed soil ground. Next, we developed a numerical model to simulate this seepage erosion phenomenon with the framework of hydraulic erosion and overhanging failure by a triple-grid approach. Since the numerical results showed a good agreement with the experimental results, we concluded that the newly proposed analytical procedure is applicable to a freeze-thaw and seepage-erosion complex geotechnical hazards, which may occur in the snowy cold regions.
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