GSTDTAP  > 气候变化
DOI10.1002/2017GL076374
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
2018-01-28
发表期刊GEOPHYSICAL RESEARCH LETTERS
ISSN0094-8276
EISSN1944-8007
出版年2018
卷号45期号:2页码:715-723
文章类型Article
语种英语
国家Peoples R China; USA
英文摘要

Safe 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.


领域气候变化
收录类别SCI-E
WOS记录号WOS:000425514300027
WOS关键词PRODUCTION TEST-SITE ; GAS-HYDRATE ; MECHANICAL-PROPERTIES ; SEISMIC VELOCITIES ; METHANE ; BEHAVIOR ; ENERGY
WOS类目Geosciences, Multidisciplinary
WOS研究方向Geology
引用统计
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/27076
专题气候变化
作者单位1.China Univ Geosci, Fac Engn, Wuhan, Hubei, Peoples R China;
2.Georgia Inst Technol, Sch Civil & Environm Engn, Atlanta, GA 30332 USA;
3.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao, Peoples R China;
4.Chinese Acad Sci, Inst Rock & Soil Mech, Wuhan, Hubei, Peoples R China
推荐引用方式
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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