| Budget Amount *help |
¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2014: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2013: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2012: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
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| Outline of Final Research Achievements |
Carbon dioxide hydrate-bearing sand specimens were prepared by using temperature controlled high pressure triaxial apparatus. Dissociation tests by heating and shear tests under undrained conditions were performed in order to investigate the deformation behavior during dissociation and shearing with different hydrate saturation. Especially, undrained triaxial tests with different strain rate were conducted to investigate the time dependency of hydrate-bearing soil.
An elasto-viscoplastic model was applied to the shear test results. In addition, a chemo-thermo-mechanically coupled numerical analyses were conducted to reproduce the dissociation tests. The proposed method well reproduce the increase in the pore pressure during dissociation and following deformation.
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