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Numerical simulation of mechanical compaction of deepwater shallow sediments
Sun, Jin1; Wu, Shiguo1,2,3; Deng, Jingen4; Lin, Hai5; Zhang, Hanyu1; Wang, Jiliang1; Gao, Jinwei1; Sun, Jin(Chinese Acad Sci, Inst Deep Sea Sci & Engn, Lab Marine Geophys & Georesources, Sanya 572000, Peoples R China)
2018-02-01
Source PublicationJOURNAL OF OCEAN UNIVERSITY OF CHINA
Volume17Issue:1Pages:53-64
Contribution Rank第1完成单位 ; 第2完成单位 ; 第3完成单位 ; 第4完成单位 ; 第5完成单位
AbstractTo study the compaction law and overpressure evolution in deepwater shallow sediments, a large-strain compaction model that considers material nonlinearity and moving boundary is formulated. The model considers the dependence of permeability and material properties on void ratio. The modified Cam-Clay model is selected as the constitutive relations of the sediments, and the deactivation/reactivation method is used to capture the moving top surface during the deposition process. A one-dimensional model is used to study the compaction law of the shallow sediments. Results show that the settlement of the shallow sediments is large under their own weight during compaction. The void ratio decreases strictly with burial depth and decreases more quickly near the seafloor than in the deeper layers. The generation of abnormal pressure in the shallow flow sands is closely related to the compaction law of shallow sediments. The two main factors that affect the generation of overpressure in the sands are deposition rate and permeability of overlying clay sediments. Overpressure increases with an increase in deposition rate and a decrease in the permeability of the overlying clay sediment. Moreover, an upper limit for the overpressure exists. A two-dimensional model is used to study the differential compaction of the shallow sediments. The pore pressure will still increase due to the inflow of the pore fluid from the neighboring clay sediment even though the deposition process is interrupted.
SubtypeArticle
KeywordMechanical Compaction Deepwater Shallow Sediments Compaction Law Shallow Water Flow Overpressure Evolution
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1007/s11802-018-3461-6
URL查看原文
Indexed BySCI
Language英语
WOS KeywordCONSOLIDATION ; BASINS ; CLAYS ; MODEL
WOS SubjectOceanography
WOS IDWOS:000419533800007
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.idsse.ac.cn/handle/183446/5257
Collection深海科学研究部_深海地球物理与资源研究室
Corresponding AuthorSun, Jin
Affiliation1.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Lab Marine Geophys & Georesources, Sanya 572000, Peoples R China
2.Qingdao Natl Lab Marine Sci & Technol, Qingdao 266237, Peoples R China
3.Univ Chinese Acad Sci, Coll Earth Sci, Beijing 100049, Peoples R China
4.China Univ Petr, State Key Lab Petr Resources & Prospecting, Beijing 102249, Peoples R China
5.CNOOC China Ltd, Tianjin Branch, Tianjin 300451, Peoples R China
Recommended Citation
GB/T 7714
Sun, Jin,Wu, Shiguo,Deng, Jingen,et al. Numerical simulation of mechanical compaction of deepwater shallow sediments[J]. JOURNAL OF OCEAN UNIVERSITY OF CHINA,2018,17(1):53-64.
APA Sun, Jin.,Wu, Shiguo.,Deng, Jingen.,Lin, Hai.,Zhang, Hanyu.,...&Sun, Jin.(2018).Numerical simulation of mechanical compaction of deepwater shallow sediments.JOURNAL OF OCEAN UNIVERSITY OF CHINA,17(1),53-64.
MLA Sun, Jin,et al."Numerical simulation of mechanical compaction of deepwater shallow sediments".JOURNAL OF OCEAN UNIVERSITY OF CHINA 17.1(2018):53-64.
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