2007 Fiscal Year Final Research Report Summary
Evaluation of Mechanical behaviour for Resources Development of Methane Hydrate-Supported Sand in Deep Seabed
| Project/Area Number |
17360226
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Geotechnical engineering
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| Research Institution | Yamaguchi University |
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Principal Investigator |
HYODO Masayuki Yamaguchi University, Graduate School of Engineering, Prof (40130091)
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| Co-Investigator(Kenkyū-buntansha) |
MURATA Hidekazu Yamaguchi University, Vice-president (80044618)
ISHIDA Tsuyoshi Kyoto University, Graduate School of Engineering, Prof (10232307)
NAKATA Yukio Yamaguchi University, Graduate School of Engineering, Assoc. Prof (90274183)
TANAKA Kazuhiro Yamaguchi University, Graduate School of Engineering, Assoc Prof (30188289)
YOSHIMOTO Norimasa Yamaguchi University, Graduate School of Engineering, Asst Prof (00325242)
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| Project Period (FY) |
2005 – 2007
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| Keywords | Methane Hydrate / Deep Seabed / Sedimentary Deposits / Resources Development / Mechanical Behaviour / Constitutive Model / Ground Deformation Model / Methane Gas |
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| Research Abstract |
The possible existence of a vast amount of methane hydrate around islands has attracted attention in Japan. At the same time, several production methods have then considered to extract the gas from the hydrate zone. Although it is known that the hydrates pose significant obstacles to drilling and production operations, them is at present only limited knowledge on the mechanical behavior of hydrate-rich zones, which is necessary to understand the stability around the site. For this purpose, a low-temperature high-pressure triaxial test equipment was developed to reproduce the temperature and pressure condition of the seabed where methane hydrate exists.
The, methane hydrate was produced in the sand specimen set in the triaxial cell to measure its shear strength. Moreover, methane hydrate formation was replicated and methane hydrate was dissociated under different conditions of temperature and pressure in order to understand the resulting deformation behavior of the ground.
On the basis of experimental results, an elastoplastic constitutive model for methane hydrate-bearing sand was developed based on subloading surface model. The bonding effect due to the cementation by methane hydrate was introduced into the model The bonding force was correlated with the pressure and temperature according to the experimental results. The simulation performed on the triaxial behaviour of methane hydrate-supported sand under various pressure and temperature condition showed good agreement with the experimental results.
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Research Products
(16 results)
