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Consolidation mechanism of high-water-content slurry during vacuum preloading with prefabricated vertical drains
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Sun, Hong-lei, He, Zi-li, Pan, Kun, Lu, Jing-ling, Pan, Xiao-dong, Shi, Li and Geng, Xue-yu (2022) Consolidation mechanism of high-water-content slurry during vacuum preloading with prefabricated vertical drains. Canadian Geotechnical Journal, 59 (8). pp. 1373-1385. doi:10.1139/cgj-2021-0248 ISSN 0008-3674.
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Official URL: http://dx.doi.org/10.1139/cgj-2021-0248
Abstract
Vacuum preloading combined with prefabricated vertical drains (PVDs) has been widely used to improve soft clayey soil deposits. However, the consolidation deformation of high-water-content slurry under vacuum pressure is still not fully understood. In this study, the displacement field of the slurry during vacuum preloading was directly observed using the particle image velocimetry (PIV) technique. The test results showed that the displacement field of the slurry could be divided into three different zones that reflect distinct consolidation patterns. In zones I and III, the slurry was predominantly compressed along the horizontal and vertical directions, respectively, whereas in zone II, compression occurred in both vertical and horizontal directions. In particular, the slurry elements in zones I and II underwent horizontal extension prior to horizontal compression. The study also visualized the boundary of the soil column and provided an equation for the relation between soil column thickness and consolidation time, which could provide a reference for the theoretical consolidation calculations related to soil columns.
Le préchargement par le vide combiné à des drains verticaux préfabriqués (PVD) a été largement utilisé pour améliorer les dépôts de sols argileux mous. Cependant, la déformation de consolidation d’une boue à forte teneur en eau sous pression sous vide n’est pas encore totalement comprise. Dans cette étude, le champ de déplacement de la boue pendant le préchargement sous vide a été directement observé en utilisant la technique de vélocimétrie par image de particules (PIV). Les résultats des essais ont montré que le champ de déplacement de la boue pouvait être divisé en trois zones différentes qui reflètent des modèles de consolidation distincts. Dans les zones I et III, la boue a été principalement comprimée dans les directions horizontale et verticale, respectivement, tandis que dans la zone II, la compression a eu lieu dans les deux directions, verticale et horizontale. En particulier, les éléments de boue des zones I et II ont subi une extension horizontale avant la compression horizontale. L’étude a également permis de visualiser la limite de la colonne de sol et de fournir une équation pour la relation entre l’épaisseur de la colonne de sol et le temps de consolidation, qui pourrait servir de référence pour les calculs théoriques de consolidation liés aux colonnes de sol. [Traduit par la Rédaction]
Item Type: | Journal Article | |||||||||||||||||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | |||||||||||||||||||||
Journal or Publication Title: | Canadian Geotechnical Journal | |||||||||||||||||||||
Publisher: | Canadian Science Publishing | |||||||||||||||||||||
ISSN: | 0008-3674 | |||||||||||||||||||||
Official Date: | August 2022 | |||||||||||||||||||||
Dates: |
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Volume: | 59 | |||||||||||||||||||||
Number: | 8 | |||||||||||||||||||||
Number of Pages: | 13 | |||||||||||||||||||||
Page Range: | pp. 1373-1385 | |||||||||||||||||||||
DOI: | 10.1139/cgj-2021-0248 | |||||||||||||||||||||
Status: | Peer Reviewed | |||||||||||||||||||||
Publication Status: | Published | |||||||||||||||||||||
Access rights to Published version: | Restricted or Subscription Access | |||||||||||||||||||||
Copyright Holders: | The Author(s) | |||||||||||||||||||||
RIOXX Funder/Project Grant: |
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