Numerical Modeling of Prefabricated Vertical Drain with Vacuum Consolidation Technique

Nguyen, Trong-Nghia; Shukla, Sanjay Kumar; Dang, Phuoc H.; Lam, Le Gia; Khatir, Samir; Cuong-Le, Thanh

doi:10.1007/s40515-021-00165-8

Cited by 6 publications

(6 citation statements)

References 12 publications

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“…These conditions posed a risk of substantial settlement after construction, necessitating ground improvement to facilitate consolidation and prevent damage to road structures during service. A comprehensive account of the project details can be found in [12]. However, a significant challenge emerged due to the proximity of nearby structures, situated very close to the construction site.…”

Section: Project Descriptionmentioning

confidence: 99%

“…Moreover, the parameters for each soil layer were derived from the details presented in [12], including values such as maximum past pressure, over consolidation ratio, vertical and horizontal permeability for each layer, and the permeability assigned to the treated zone. It is important to highlight that the current approach involved employing the same simulation method for the PVD treated zone, which was replaced with an equivalent soil layer possessing similar properties.…”

Section: Numerical Simulationsmentioning

confidence: 99%

“…However, the vertical permeability for this layer was modified based on [16]. The loading sequence was also outlined in the study by [12]. The sheet pile type NS-SP-IV had sectional area = 225.5 cm 2 /m and moment of inertia = 56,700 cm 4 /m.…”

Section: Numerical Simulationsmentioning

confidence: 99%

“…Numerous laboratory tests, including the use of modified triaxial test devices [3,4,5], have explored the lateral displacement associated with this technique. Additionally, several studies have proposed straightforward techniques for predicting such displacement Despite the wealth of analytical [8][9][10] and numerical [1,6,7,12,13] studies examining vertical and lateral displacements resulting from PVD with vacuum consolidation, a critical aspect remains largely unexplored: the identification of countermeasures to effectively mitigate these substantial displacements. In the analysis of the Bachiem road construction case study, a strategic solution emerged to mitigate displacements linked to embankment construction, employing steel sheet piles.…”

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confidence: 99%

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Analyzing Embankment Displacement: PVD and Vacuum Consolidation with Sheet Pile Protection

Nguyen,

Vo Nguyen

2024

Eng. Technol. Appl. Sci. Res.

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The global widespread adoption of Prefabricated Vertical Drains (PVD) in conjunction with vacuum consolidation is driven by its robust and cost-efficient attributes. However, this construction method is not without challenges, as it has been linked to substantial displacements, posing risks to adjacent structures. Addressing such concerns in a Vietnamese road construction project, this study focuses on the innovative contribution of sheet pile protection as a highly effective solution. Utilizing numerical analysis with an anisotropic model, we examine the impact of sheet pile protection on embankment displacement. Through comparative analysis with field data, our study demonstrates the remarkable efficacy of the sheet pile method in significantly reducing both vertical and lateral settlements. Acting as a protective membrane, it effectively counters suction from the PVD vacuum zone. These findings make a substantial contribution to the field, providing engineers handling similar structural protection scenarios with invaluable insights and a novel approach to mitigating displacements associated with PVD and vacuum consolidation.

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Section: Project Descriptionmentioning

confidence: 99%

Section: Numerical Simulationsmentioning

confidence: 99%

Section: Numerical Simulationsmentioning

confidence: 99%

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confidence: 99%

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Analyzing Embankment Displacement: PVD and Vacuum Consolidation with Sheet Pile Protection

Nguyen,

Vo Nguyen

2024

Eng. Technol. Appl. Sci. Res.

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“…Various techniques for improving highway embankments in the Mekong Delta have been explored, including soil cement stabilization, sand compaction piles, and soil cement columns [3,4]. However, prefabricated vertical drains (PVDs) have gained prominence due to their cost-effectiveness, swift installation, and environmental safety [5][6][7]. Initial PVD research focused on enhancing soft clay conditions in southern Vietnam, followed by performance evaluation, model testing, and numerical modeling [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Roadway Settlement Characteristics on Mekong Delta for Various Landforms

Vo Ai Mi

2023

GEOMATE

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The road network in the Mekong Delta faces challenges due to its low-lying topography and extensive layers of soft clay. These deposits, reaching depths of up to 25 m, are found in backswamp/swamp, sand dune, and mangrove marsh landforms. These soils generally have low total unit weight, high water content, and high compressibility. They are problems for road construction, and soft ground treatment must be applied. This study utilized data from 53 boreholes to assess the consolidation characteristics of each landform. According to the typical highway embankment construction, the primary consolidation showed the highway settlement in the ranges 186-1,174 mm, 107-1,049 mm, and 537-1,364 mm for the backswamp/swamp, sand dune, and mangrove marsh, landforms, respectively. These settlements exceed the maximum level of 250 mm for allowable settlement at 5 years post-construction. To address this issue, the prefabricated vertical drain (PVD) method is proposed as a solution to expedite settlement. PVDs, designed with 12-14 m, 10-12 m, and 14-16 m for the backswamp/swamp, sand dune, and mangrove marsh landforms, respectively, and a spacing of 1 m, accelerated the consolidation process, resulting in consolidation percentages of 87-92% within a notably shortened timeframe of 3 months through preloading. Upon completion of the preloading period, the remaining settlement ranges were 54-130 mm, 27-83 mm, and 67-170 mm for the backswamp/swamp, sand dune, and mangrove marsh landforms, respectively, which are all within the permissible limit (250 mm). These findings are important, as they offer valuable insights for the future planning, preliminary design, and construction of highway embankments, emphasizing the importance of incorporating PVDs as an effective measure in mitigating settlement issues.

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