Triaxial Compressive Properties of Artificial Methane-Hydrate-Bearing Sediments Containing Fine Fraction

• MIYAZAKI Kuniyuki

  National Institute of Advanced Industrial Science and Technology (AIST)

• SAKAMOTO Yasuhide

  National Institute of Advanced Industrial Science and Technology (AIST)

• KAKUMOTO Masayo

  National Institute of Advanced Industrial Science and Technology (AIST)

• TENMA Norio

  National Institute of Advanced Industrial Science and Technology (AIST)

• AOKI Kazuo

  National Institute of Advanced Industrial Science and Technology (AIST)

• YAMAGUCHI Tsutomu

  Department of Environmental Science, Toho University

Bibliographic Information

Other Title

• 細粒分を含む模擬メタンハイドレート含有砂質堆積物の三軸圧縮特性とメタンハイドレート分解時の力学挙動
• サイリュウ ブン オ フクム モギ メタンハイドレート ガンユウ サシツ タイセキブツ ノ 3ジク アッシュク トクセイ ト メタンハイドレート ブンカイジ ノ リキガク キョドウ

Abstract

In this study, drained triaxial compression tests were conducted on artificial methane-hydrate-bearing sediments containing fine fraction. Toyoura sand (average particle size: D₅₀ = 0.230 mm, fine fraction content: F_c = 0%) , No.7 silica sand (D₅₀ = 0.205 mm, F_c = 1.1%) and No.8 silica sand (D₅₀ = 0.130 mm, F_c = 11.5%) were used as the skeleton of each specimens. Axial loading was conducted at an axial strain rate of 0.1 %/min at a constant temperature of 278 K. The cell pressure and pore pressure were kept constant during axial loading. We found that the strength of the hydrate-sand specimens is almost independent of the type of sand forming the skeleton of the specimen. On the other hand, the stiffness of the specimens containing finer sand particles is lower, probably because fine sand particles can more easily penetrate between the sand and hydrate particles, resulting in larger axial deformation. During the dilatant behavior, the lateral expansive displacement of specimens containing finer sand particles is smaller because the compaction process may continue to occur even when the dilatant behavior becomes the dominant mechanism. The formula expressing the secant Young's modulus obtained from the triaxial compression tests was constructed as a function of methane hydrate saturation and effective confining pressure and was introduced to a numerical simulator. The compressive displacement observed in the earlier work concerning the laboratory-scale experiments of methane hydrate dissociation was simulated by the numerical simulator.

Journal

• Journal of MMIJ

  Journal of MMIJ 127 (9), 565-576, 2011

  The Mining and Materials Processing Institute of Japan

Keywords

• Methane Hydrate
• Triaxial Compression Test
• Strength
• Elastic Modulus
• Fine Fraction
• Depressurization Method

Details

• CRID: 1390282680258736896
• NII Article ID: 10029494673
• NII Book ID: AA12188381
• DOI: 10.2473/journalofmmij.127.565
• COI: 1:CAS:528:DC%2BC3MXhsVyjsbfF
• ISSN: 18840450
• ISSN: 18816118
• NDL BIB ID: 11221026
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I11221026
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed