Strain Rate Dependency of Peak and Residual Strength of Sediment Containing Synthetic Methane Hydrate
| Autor: | Yasuhide Sakamoto, Yuji Ogata, Hironori Haneda, Kazuo Aoki, Seisuke Okubo, Akira Masui, Tsutomu Yamaguchi, Kuniyuki Miyazaki |
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| Rok vydání: | 2008 |
| Předmět: | |
| Zdroj: | Journal of MMIJ. 124:619-625 |
| ISSN: | 1884-0450 1881-6118 |
| Popis: | In this study, triaxial compression tests were conducted for Toyoura sand containing synthetic methane hydrate at conditions of confining pressure 9 MPa, pore water pressure 8 MPa and temperature 278 K. In the test, strain rate was switched between C1 and C2 (C1 C2) at every predetermined strain interval, and two stress-strain curves at strain rates of C1 and C2 were estimated from a single specimen.As a result, the peak strength at the faster strain rate C2 was higher than that at the slower strain rate C1. It was also found that strain-rate dependency of peak strength increased with methane hydrate saturation. It can be said that methane hydrate saturation significantly affected to the strain-rate dependency and then failure mechanism of the methane hydrate sediments.Strain-rate dependency of residual strength (stress in the post failure region) was discussed. The ratio, (stress at the strain rate C2 / stress at the strain rate C1), was almost constant in the region. This finding may suggest that the mechanism of strain-rate dependency or time-dependent behavior of methane hydrate sediments does not change in the post-failure region. |
| Databáze: | OpenAIRE |
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