- Application of Hybrid Drained-Undrained Model for Analyzing the Stability of Reinforced Soil Structures Over Soft Foundations with Prefabricated Vertical Drains
- David Espinoza ; Chunling Li ; Lucas de Melo ; Ranjiv Gupta
- Book Title / Journal: International Journal of Geoengineering Case Histories
- Year: 2020 , Volume: 5
- Prefabricated Vertical Drains ; Road Embankments
- Keywords: Hybrid Drained-Undrained model ; Slope stability ; prefabricated vertical drain ; limit equilibrium ; shear strength
- Abstract
Prefabricated Vertical Drains (PVDs) are typically used for embankment construction over saturated soft cohesive soil deposits to accelerate consolidation and reduce construction time in the field. PVDs accelerate consolidation of thick soil deposits by reducing the drainage path from tens of meters to 1-2 meters depending on PVD spacing in the field. Current design methodologies typically consider the increase of shear strength due to accelerated consolidation, but still use undrained shear strength for the entire cohesive soil layer even after PVD’s are installed. However, for cases in which PVDs are closely spaced, which allows excess pore water pressure to dissipate relatively fast, the assumption of undrained conditions for design may be overly conservative and, in some cases, this assumption may render an embankment construction unfeasible, unless additional ground improvement techniques are used to significantly enhance the foundation strength. This paper presents a Hybrid Drained-Undrained (HDU) model for construction of embankments over soft soils that accounts for the improved soil drainage conditions after installation of PVDs in the assessment of the shear strength used for design. A field case study is presented where the HDU methodology was used for the design of a 2.4-km long MSE berm constructed over a PVD-improved soft soil site, allowing for significant cost savings. The HDU approach was implemented using limit equilibrium models during the design stages to analyze the global stability of the MSE berm at different stages. Finite element models calibrated using field monitoring data collected during construction showed factors of safety comparable with that calculated using the HDU approach, which further supports the suitability of the HDU approach for PVD design. PDF |
- Numerical Modelling of a Deep Cement Mixed Column Supported Embankment
- D.S. Liyanapathirana ; N.N.S. Yapage ; H.G. Poulos ; R.B. Kelly
- ICGE Colombo 2015
- Year: 2015
- Numerical & Constitutive Modeling ; Deep Soil Mixing ; Road Embankments
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- Settlement Behavior of Peat Under Embankment Loading - monitoring in Full-scale Test Embankment and its Prediction
- H. Hayashi ; T. Yamanashi
- ICGE Colombo 2015
- Year: 2015
- Settlements ; Road Embankments
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- Process of Preload and Surcharge Release for Embankments Constructed Over Soft Soils
- Z.H.F. Lai ; J.P. Hsi
- ICGE Colombo 2015
- Year: 2015
- Road Embankments
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- Interpretation of the Effect of Compaction on the Mechanical Behavior of Embankment Materials Based on the Soil Skeleton Structure Concept
- M. Nakano ; T. Sakai
- Proceedings of the 18th International Conference on Soil Mechanics and Geotechnical Engineering, Paris, September 2-6 2013
- Year: 2013
- Ground Improvement ; Road Embankments ; Soil Behavior Modeling
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- LGV EST section 41 : measured and calculated settlements under embankments
- D. Gandille ; N. Bacar-Fadhuli ; F. Hajouai ; L. Boutonnier
- Proceedings of the 18th International Conference on Soil Mechanics and Geotechnical Engineering, Paris, September 2-6 2013
- Year: 2013
- Settlements ; Road Embankments
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- Deformation Performance and Stability Control of Multi-stage Embankments in Ireland
- F.J. Buggy ;
- Proceedings of the 18th International Conference on Soil Mechanics and Geotechnical Engineering, Paris, September 2-6 2013
- Year: 2013
- Road Embankments ; Slope Stability ; Road Embankments ; Slope Stability
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- The geotechnical analysis corresponding to the high road embankments close to a bridge
- D. Tenea ; D. Vintila ; A. Chirica
- Proceedings of the 18th International Conference on Soil Mechanics and Geotechnical Engineering, Paris, September 2-6 2013
- Year: 2013
- Road Embankments
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- Equilibrium models for arching in basal reinforced piled embankments
- A. Bezuijen ; S.J.M. Eekelen-van
- Proceedings of the 18th International Conference on Soil Mechanics and Geotechnical Engineering, Paris, September 2-6 2013
- Year: 2013
- Pile Foundations ; Road Embankments ; Stabilization ; Numerical & Constitutive Modeling
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- Evaluation of the Performance of Road Embankments over North Jakarta-Soft Soils
- R. Taufik ; Hendarto ; H. Rahadian ; D. Murjanto
- Proceedings of the 18th International Conference on Soil Mechanics and Geotechnical Engineering, Paris, September 2-6 2013
- Year: 2013
- Road Embankments
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- A new test field in sulphide clay with test embankments for study of compression properties
- M. Andersson ; B. Westerberg
- Proceedings of the 18th International Conference on Soil Mechanics and Geotechnical Engineering, Paris, September 2-6 2013
- Year: 2013
- Road Embankments ; Settlements ; Site Characterization & In-situ Testing (General)
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- The performance of shale as fill and embankment material for a trunk road in Ghana
- S.K. Gawu ; J.K. Oddei ; K.M. Solomon
- Proceedings of the 18th International Conference on Soil Mechanics and Geotechnical Engineering, Paris, September 2-6 2013
- Year: 2013
- Landfill Engineering ; Transportation Geotechnics ; Road Embankments
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- Design and performance of a jet grout retaining wall in a railway embankment on soft soil
- L. De-Vos ; Clercq De ; C. Lejeune ; W. Maekelberg ; J. Verstraelen
- Proceedings of the 18th International Conference on Soil Mechanics and Geotechnical Engineering, Paris, September 2-6 2013
- Year: 2013
- Grouting ; Retaining Walls ; Railway Geotechnics ; Road Embankments ; Landslides ; Foundation Design / Construction
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- Column Supported Embankments for Transportation Infrastructures: Influence of Column Stiffness, Consolidation Effects and Cyclic Loading
- W. Wehr ; C. Sagaseta ; G. Vukotic ; E. Carvajal
- Proceedings of the 18th International Conference on Soil Mechanics and Geotechnical Engineering, Paris, September 2-6 2013
- Year: 2013
- Road Embankments ; Ground Improvement
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- Foundations of embankments using encased stone columns
- M. Miranda ; A. Da-Costa ; J. Cañizal ; C. Sagaseta ; J. Castro
- Proceedings of the 18th International Conference on Soil Mechanics and Geotechnical Engineering, Paris, September 2-6 2013
- Year: 2013
- Road Embankments ; Ground Improvement
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