Geo-Congress 2020
A Large Strain Consolidation Model for Dredged Clays with High Water Content under Vacuum Preloading
Publication: Geo-Congress 2020: Foundations, Soil Improvement, and Erosion (GSP 315)
ABSTRACT
Newly dredged clay is commonly hydraulic mud that contains a large amount of fine soil particles and has a higher water content. The dredged clay is often times too soft for the surcharge to be applied. Vacuum preloading technology can be an attractive technology rather than surcharge preloading. In order to better apply vacuum preloading technology to dredged clays, it is necessary to establish a large strain consolidation model. Based on the Gibson‘s one dimensional large-strain theory and Barron‘s free strain theory, and abandoning the equal strain assumption, introducing the negative pore water pressure boundary condition, a large strain consolidation model is established by incorporating the radial and vertical flows and the weight of the soil. The material nonlinearity is considered in the large strain consolidation model. It is found that the nonlinear compression and nonlinear permeability have the significant influence on the consolidation effect. In addition, the large strain vacuum consolidation model is compared with the small strain degradation consolidation model, the two models differ greatly in excess pore pressure dissipation and degree of consolidation. The large strain vacuum consolidation model must be taken into account in the prediction of vacuum preloading effect of dredged clays.
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7 Acknowledgments
This study is supported by the Postgraduate Research & Practice Innovation Program of Jiangsu Province (KYCX18_0123).
REFERENCES
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Information & Authors
Information
Published In
Geo-Congress 2020: Foundations, Soil Improvement, and Erosion (GSP 315)
Pages: 449 - 457
Editors: James P. Hambleton, Ph.D., Northwestern University, Roman Makhnenko, Ph.D., University of Illinois at Urbana-Champaign, and Aaron S. Budge, Ph.D., Minnesota State University, Mankato
ISBN (Online): 978-0-7844-8278-0
Copyright
© 2020 American Society of Civil Engineers.
History
Published online: Feb 21, 2020
ASCE Technical Topics:
- Clays
- Consolidated soils
- Design (by type)
- Dredging
- Engineering fundamentals
- Geomechanics
- Geotechnical engineering
- Hydraulic models
- Load factors
- Material mechanics
- Materials engineering
- Models (by type)
- Preloading
- River engineering
- Sediment
- Soil mechanics
- Soil properties
- Soil stress
- Soil water
- Soils (by type)
- Strain
- Structural design
- Water and water resources
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