Release Time:2019-03-11  Hits:

Indexed by: Conference Paper

Date of Publication: 2015-01-01

Included Journals: SCIE、CPCI-S

Page Number: 911-915

Key Words: methane hydrate-bearing sediments; ice-marine soil mixtures; mechanical properties; cohesive force; internal friction angle

Abstract: The huge amount of potential natural gas hydrate resource has a great prospect for the exploration and exploitation in the world. Recently, the mechanical properties of the sediments containing gas hydrates have been studied systematically; however, the mechanical properties of gas hydrate-bearing sediments in the Shenhu Area of the South China Sea were little investigated. In this paper, synthesized methane hydrate-ice mixtures were mixed with marine silty soil or kaolin clay to form two types of methane hydrate-bearing sediments, and ice-clay mixtures were formed by using marine and pure ice powder. Based on a series of triaxial tests, the stress-strain curves were obtained, and the similarities and differences of stress-strain behavior and strength properties between them were studied. Moreover, according to the Mohr-Coulomb strength theory, the data of the cohesive force and the internal friction angle were calculated to analyze the mechanism of the strength similarities and differences between the hydrate-ice-marine silty soil mixtures, hydrate-ice-kaolin clay mixtures, and ice-marine soil mixtures.