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Mechanism of soil stratum instability induced by hydrate dissociation
Zhang XH(张旭辉); Lu XB(鲁晓兵); Chen XD; Zhang LM; Shi YH; Zhang, XH (reprint author), Chinese Acad Sci, Inst Mech, Beijing, Peoples R China.
AbstractGas hydrate dissociation may lead to soil stratum instability such as marine landslides in hydrate-bearing sediments. In this paper, centrifugal tests were conducted to investigate the soil responses and stratum instability of a 14 degrees slope during hydrate dissociation under centrifugal accelerations of 50g and 100g, different boundary conditions and heating modes. New phenomena such as sliding of the over layer, layered fractures between the hydrate layer and the over layer, and fractures in the over layer were observed. The fluid pressures, horizontal displacements and vertical displacements of the soils were measured and compared under different conditions. The observed mechanisms and decoupled formulations considering heat transfer, fluid seepage, soil deformation and critical soil failure were presented and discussed. The formation of layered fractures during hydrate dissociation is regarded as an important factor leading to the instability of the slope. (C) 2016 Elsevier Ltd. All rights reserved.
KeywordHydrate Dissociation Centrifugal Test Heat Transfer Slope Stability Fractures
Indexed BySCI ; EI
WOS IDWOS:000381530800008
WOS KeywordHydrate dissociation ; Centrifugal test ; Heat transfer ; Slope stability ; Fractures
WOS Research AreaEngineering ; Oceanography
WOS SubjectEngineering, Marine ; Engineering, Civil ; Engineering, Ocean ; Oceanography
Funding OrganizationThis study is funded by China Geological Survey (No. GZH201100311), National Natural Science Foundation of China (Nos. 51239010, 11102209), and CNPC-CAS cooperation project (No. 2015A-4813).
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Cited Times:7[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorZhang, XH (reprint author), Chinese Acad Sci, Inst Mech, Beijing, Peoples R China.
Recommended Citation
GB/T 7714
Zhang XH,Lu XB,Chen XD,et al. Mechanism of soil stratum instability induced by hydrate dissociation[J]. OCEAN ENGINEERING,2016,122:74-83.
APA 张旭辉,鲁晓兵,Chen XD,Zhang LM,Shi YH,&Zhang, XH .(2016).Mechanism of soil stratum instability induced by hydrate dissociation.OCEAN ENGINEERING,122,74-83.
MLA 张旭辉,et al."Mechanism of soil stratum instability induced by hydrate dissociation".OCEAN ENGINEERING 122(2016):74-83.
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