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论文类型：期刊论文

发表时间：2011-12-01

发表刊物：INTERNATIONAL JOURNAL OF OFFSHORE AND POLAR ENGINEERING

收录刊物：Scopus、SCIE、EI

卷号：21

期号：4

页面范围：316-322

ISSN号：1053-5381

关键字：Stress-strain behavior; strength; constitutive model; methane hydrate-bearing sediments; porosity; confining pressure; temperature; strain rate

摘要：To study the stress-strain behavior of methane hydrate-bearing sediments with various porosity that was tremendously affected by environmental conditions a series of triaxial tests was performed using artificial samples of methane hydrate-bearing sediments under various conditions with confining pressures (P) at 2.5, 3.75 and 5 MPa, temperatures (theta) at -5 degrees C, -10 degrees C and -20 degrees C, and strain rates at 0.1, 0.5 and 1%/min. The variation of deviator stress with axial strain was observed, and the strain type was analyzed systematically under different experimental conditions. In addition, based on the experimental and analysis results of the stress-strain behavior of triaxial tests, this paper proposes the modified nonlinear elastic Duncan-Chang constitutive model, whose coefficients contain the main factors affecting stress-strain behavior.