メタンハイドレートを含む模擬堆積物の三軸圧縮特性におよぼすひずみ速度の影響

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タイトル別名
  • Strain Rate Dependency of Sediment Containing Synthetic Methane Hydrate in Triaxial Compression Test
  • メタン ハイドレート オ フクム モギ タイセキブツ ノ 3ジク アッシュク トクセイ ニ オヨボス ヒズミ ソクド ノ エイキョウ

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Methane hydrate is anticipated to be a promising energy resource of natural gas, since a large amount of reservoir exists in marine sediments or in permafrost regions worldwide. In order to evaluate a productivity of methane gas from methane hydrate reservoirs, it is necessary to develop a gas production numeric simulator. And, for precise assessment of long-term gas productivity, it is important to consider time-dependent properties of sediments containing methane hydrate.<BR>In this study, loading rate dependency, one of important time-dependent properties, of artificial sediment containing methane hydrate was experimentally examined. Results of triaxial compression tests of water-saturated Toyoura sand (saturated-sand specimen) and Toyoura sand containing synthetic methane hydrate (hydrate-sand specimen), at conditions of confining pressure 9MPa, pore water pressure 8MPa and temperature 278K, were presented. Loading was conducted at a constant strain rate or alternating strain rate. In constant strain rate test, specimen was loaded at strain rate of 0.1%/min, 0.05%/min and 0.01%/min. In alternating strain rate test, one specimen was loaded at a strain rate alternated between the lower rate C1 and the higher rate C2 at strain intervals Δε. The conditions of C1, C2 and Δε were briefly examined in this study.<BR>Experimental results indicate that saturated-sand specimen shows very weak strain rate dependency suggesting that, in most cases, time-dependency is negligible small. Strain rate dependency of the peak strength for hydrate-sand specimen was considerably stronger than that of saturated-sand specimen. Referring to earlier works, the time-dependency of hydrate-sand specimen seemed to be weaker than that of ice or methane hydrate and comparable with that of frozen sand.

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  • 資源と素材

    資源と素材 123 (11), 537-544, 2007

    一般社団法人 資源・素材学会

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