| Project/Area Number |
25870007
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Civil engineering materials/Construction/Construction management
Geotechnical engineering
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| Research Institution | Hokkaido University |
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Principal Investigator |
NISHIMURA Satoshi 北海道大学, 工学(系)研究科(研究院), 准教授 (70470127)
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| Project Period (FY) |
2013-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2014: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2013: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
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| Keywords | 泥炭 / パイプライン / 沈下 / 長期管理 / 地盤沈下 |
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| Outline of Final Research Achievements |
Buried pipelines in peat ground have been found to suffer long-term subsidence, necessitating expensive maintenance work. This problem was confirmed by analysing 18-year records of pipeline subsidence and correlating them with peat layers distribution. One of the suspected causes of the subsidence is an effective stress increase due to replacement of light peat by heavier sandy fills around the pipelines. The detailed mechanisms behind the subsidence were studied by performing long-term model tests and elasto-plastic finite element analysis, and were interpreted and explained with the aid of the deformation characteristics of peat established by long-term triaxial tests. As countermeasure, a possibility of adopting granularised stabilised soil as a fill around the pipeline was explored. Its small unit weight and low subgrade stiffness was found to be advantageous in preventing long-term subsidence as well as alleviating forced straining due to any remaining differential settlement.
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