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https://hdl.handle.net/20.500.14094/90007249
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2024-04-20
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90007249 (fulltext)
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1.89 MB
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メタデータID
90007249
アクセス権
open access
出版タイプ
Version of Record
タイトル
Analytical investigation of disturbance of seabed-sampled soil specimens and its influence on unconfined strength
著者
Sugiyama, Yuri ; Tachibana, Shinya ; Sakaguchi, Hide ; Iizuka, Atsushi
著者名
Sugiyama, Yuri
著者ID
A0089
研究者ID
1000090432567
KUID
https://kuid-rm-web.ofc.kobe-u.ac.jp/search/detail?systemId=aec50f4adaf6f97a520e17560c007669
著者名
Tachibana, Shinya
橘, 伸也
タチバナ, シンヤ
所属機関名
都市安全研究センター
著者名
Sakaguchi, Hide
著者ID
A0403
研究者ID
1000040184361
KUID
https://kuid-rm-web.ofc.kobe-u.ac.jp/search/detail?systemId=0377c7775de5d912520e17560c007669
著者名
Iizuka, Atsushi
飯塚, 敦
イイヅカ, アツシ
所属機関名
都市安全研究センター
収録物名
Soils and Foundations
巻(号)
58(3)
ページ
689-701
出版者
Elsevier B.V.
刊行日
2018-06
公開日
2020-07-17
抄録
In view of the need to utilize ocean space and to develop seabed resources, the assessment of the stability of deep seabed soil has emerged as an important challenge in the field of geomechanics. To study seabed stability, the strength and stiffness of the natural ground must be ascertained. Accordingly, it is necessary either to conduct laboratory testing on soil specimens sampled from the seabed or to estimate the strength and stiffness by in-situ tests. While in the future it may be reasonable to conduct in-situ tests to estimate the stiffness and strength of seabed soil, it will still be necessary to compare the physical properties measured by in-situ testing with those measured by laboratory testing in advance of these determinations. In short, soil specimens must be sampled from the actual deep seabed, and laboratory mechanical tests must be conducted on the sampled soil specimens. However, soil sampled from the ocean bottom is subject to effects that differ from those exerted on soil sampled from the earth. More specifically, the non-negligible effects of disturbance are expected with soil sampled from the ocean bottom. The effects of disturbance occur during the sampling process due to the vaporization of dissolved gases, as these soil specimens are under relatively higher pressure and contain pore water with a high amount of dissolved gases. Therefore, numerical simulations were conducted in the present study to investigate the effects of vaporized dissolved gases on the mechanical behavior of soil specimens during sampling and on the undrained shear strength as determined by laboratory tests. The analyses revealed that the combination of the decreasing effective stress caused by the sampling and factors such as overconsolidation and unsaturation is attributable to the difference between the soil strength ascertained by laboratory testing and the in-situ soil strength.
キーワード
Disturbance
Marine clay
Unsaturated soil
Numerical simulation
Henry's law
Unconfined undrained test
カテゴリ
都市安全研究センター
学術雑誌論文
権利
© 2018 Production and hosting by Elsevier B.V. on behalf of The Japanese Geotechnical Society.
This is an open access article under CC BY-NC-ND license. (http://creativecommons.org/licenses/by-nc-nd/4.0/)
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資源タイプ
journal article
言語
English (英語)
ISSN
0038-0806
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NCID
AA00700879
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関連情報
DOI
https://doi.org/10.1016/j.sandf.2018.02.026
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