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Strength Estimation for Hydrate-Bearing Sediments From Direct Shear Tests of Hydrate-Bearing Sand and Silt
Liu, Zhichao1,2; Dai, Sheng2; Ning, Fulong1,3; Peng, Li1; Wei, Houzhen4; Wei, Changfu4
2018
Source PublicationGEOPHYSICAL RESEARCH LETTERS
ISSN0094-8276
Volume45Issue:2Pages:715-723
AbstractSafe and economic methane gas production, as well as the replacement of methane while sequestering carbon in natural hydrate deposits, requires enhanced geomechanical understanding of the strength and volume responses of hydrate-bearing sediments during shear. This study employs a custom-made apparatus to investigate the mechanical and volumetric behaviors of carbon dioxide hydrate-bearing sediments subjected to direct shear. The results show that both peak and residual strengths increase with increased hydrate saturation and vertical stress. Hydrate contributes mainly the cohesion and dilatancy constraint to the peak strength of hydrate-bearing sediments. The postpeak strength reduction is more evident and brittle in specimens with higher hydrate saturation and under lower stress. Significant strength reduction after shear failure is expected in silty sediments with high hydrate saturation S-h >= 0.65. Hydrate contribution to the residual strength is mainly by increasing cohesion at low hydrate saturation and friction at high hydrate saturation. Stress state and hydrate saturation are dominating both the stiffness and the strength of hydrate-bearing sediments; thus, a wave velocity-based peak strength prediction model is proposed and validated, which allows for precise estimation of the shear strength of hydrate-bearing sediments through acoustic logging data. This method is advantageous to geomechanical simulators, particularly when the experimental strength data of natural samples are not available.
DOI10.1002/2017GL076374
Indexed BySCI
Language英语
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000425514300027
PublisherAMER GEOPHYSICAL UNION
Citation statistics
Cited Times:21[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://119.78.100.198/handle/2S6PX9GI/4201
Collection岩土力学所知识全产出_期刊论文
Affiliation1.China Univ Geosci, Fac Engn ;
2.Georgia Inst Technol, Sch Civil & Environm Engn;
3.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources ;
4.Chinese Acad Sci, Inst Rock & Soil Mech
Recommended Citation
GB/T 7714
Liu, Zhichao,Dai, Sheng,Ning, Fulong,et al. Strength Estimation for Hydrate-Bearing Sediments From Direct Shear Tests of Hydrate-Bearing Sand and Silt[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(2):715-723.
APA Liu, Zhichao,Dai, Sheng,Ning, Fulong,Peng, Li,Wei, Houzhen,&Wei, Changfu.(2018).Strength Estimation for Hydrate-Bearing Sediments From Direct Shear Tests of Hydrate-Bearing Sand and Silt.GEOPHYSICAL RESEARCH LETTERS,45(2),715-723.
MLA Liu, Zhichao,et al."Strength Estimation for Hydrate-Bearing Sediments From Direct Shear Tests of Hydrate-Bearing Sand and Silt".GEOPHYSICAL RESEARCH LETTERS 45.2(2018):715-723.
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