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论文类型：期刊论文

发表时间：2016-11-01

发表刊物：JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING

收录刊物：SCIE、EI、Scopus

卷号：147

页面范围：77-86

ISSN号：0920-4105

关键字：Hydrate dissociation; Methane hydrate-bearing sediments; Stability; Duncan-Chang constitutive model

摘要：Based on a series of triaxial compression tests on methane hydrate-bearing sediments after a hydrate dissociation time of 0 h,1 h, 6 h, 12 h, or 24 h, the mechanical properties of the sediments were studied during hydrate dissociation at different temperatures. The results showed that strain softening behavior appeared at higher temperatures in our work. The failure strength and initial yield strength both decreased with an increase in the methane hydrate dissociation time, and the rate of decline of failure strength was faster at higher temperatures. Mathematical expressions for the failure strength and the initial yield strength in terms of the dissociation time and the temperature were also proposed. Moreover, the Duncan-Chang constitutive model of methane hydrate-bearing sediments considering the influence of temperature and hydrate dissociation time was developed, and the validity of most of the calculated results was verified by experiment. (C) 2016 Elsevier B.V. All rights reserved.