2016 Fiscal Year Final Research Report
New development and validation of three-phase thermomechanics of soils explaining frozen-unfrozen transition behaviour
| Project/Area Number |
15K14025
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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 |
Geotechnical engineering
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| Research Institution | Hokkaido University |
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Principal Investigator |
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| Project Period (FY) |
2015-04-01 – 2017-03-31
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| Keywords | 凍結土 / 強度 / 変形特性 / 地盤凍結 / 室内土質試験 |
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| Outline of Final Research Achievements |
A theory was proposed by which mechanical behaviour of soils at frozen, unfrozen and transitional states is described rationally and seamlessly, by coupling the principle of effective stress, thermodynamic equations, and other physical requirements. A suite of laboratory thermomechanical and physical experiments was conducted by focusing on a two-material, three-phase soil system (soil particles, liquid water and ice). The modelling theory systematically explains some characteristic features of frozen soil behaviour, such as the strength degradation by pressure-melting, apparent confining stress-dependency of the strength, etc., seen in clays and sands. This theoretical framework will allow developing a coupled simulator for advanced prediction of artificial ground freezing impacts and assessing cold-region natural disasters.
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| Free Research Field |
土質力学
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