Creep Behaviors of Methane Hydrate-Bearing Frozen Sediments

被引:26
作者
Li, Yanghui [1 ]
Wu, Peng [1 ]
Sun, Xiang [1 ,2 ]
Liu, Weiguo [1 ]
Song, Yongchen [1 ]
Zhao, Jiafei [1 ]
机构
[1] Dalian Univ Technol, Minist Educ, Key Lab Ocean Energy Utilizat & Energy Conservat, Dalian 116024, Peoples R China
[2] Univ Calif Berkeley, Dept Civil & Environm Engn, Berkeley, CA 94720 USA
基金
中国国家自然科学基金;
关键词
methane hydrate; creep tests; permafrost; mechanical property; GAS HYDRATE; MECHANICAL-BEHAVIOR; DEFORMATION-BEHAVIOR; SHEAR-STRENGTH; PERMAFROST; DISSOCIATION; QINGHAI; MODEL; SAND;
D O I
10.3390/en12020251
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
Creep behaviors of methane hydrate-bearing frozen specimens are important to predict the long-term stability of the hydrate-bearing layers in Arctic and permafrost regions. In this study, a series of creep tests were conducted, and the results indicated that: (1) higher deviator stress (external load) results in larger initial strain, axial strain, and strain rate at a specific elapsed time. Under low deviator stress levels, the axial strain is not large and does not get into the tertiary creep stage in comparison with that under high deviator stress, which can be even up to 35% and can cause failure; (2) both axial strain and strain rate of methane hydrate-bearing frozen specimens increase with the enhancement of deviator stress, the decrease of confining pressure, and the decrease of temperature; (3) the specimens will be damaged rather than in stable creep stage during creeping when the deviator stress exceeds the quasi-static strength of the specimens.
引用
收藏
页数:17
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