Design chart for prefabricated vertical drains improved ground

Abuel-Naga, Hossam; Bergado, D. T.; Gniel, Joel Robert

doi:10.1016/j.geotexmem.2015.04.021

Cited by 16 publications

(6 citation statements)

References 43 publications

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“…where de is the increment of void ratio, C s is the recompression index, C c is the compression index, and dσ is the increment of effective stress. [2,7,29,30] and the finite difference method [4,27,[31][32][33] are the two most commonly used methods. Moreover, other effective numerical methods were also adopted [34][35][36][37].…”

Section: Nonlinear Compressibilitymentioning

confidence: 99%

“…To improve the calculation accuracy, many modifications of the assumptions have been proposed. Past studies mainly investigated the variations of material parameters, such as the permeability and the compressibility [3][4][5][6][7][8][9][10], and many advances related to varying loading, which better reflect real constructions, were obtained [11][12][13][14][15]. As a simplification of inhomogeneity along depth, multilayered soil was studied [16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

“…With the development of numerical methods, complex consolidation equations can be solved efficiently, thereby allowing many modifications to be incorporated into the consolidation calculations. The finite element method [2,7,29,30] and the finite difference method [4,27,[31][32][33] are the two most commonly used methods. Moreover, other effective numerical methods were also adopted [34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

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Finite Element Study on Calculation of Nonlinear Soil Consolidation Using Compression and Recompression Indexes

Chao

Pan

2020

Applied Sciences

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The coefficient of consolidation is traditionally considered as a constant value in soil consolidation calculations. This paper uses compression and recompression indexes to calculate the solution-dependent nonlinear compressibility, thus overconsolidation and normal consolidation are separated during the calculations. Moreover, the complex nonlinear consolidation can be described using the nonlinear compressibility and a nonlinear permeability. Then, the finite element discrete equation with consideration of the time-dependent load is derived, and a corresponding program is developed. Subsequently, a case history is conducted for verifying the proposed method and the program. The results show that the method is sufficiently accurate, indicating the necessity of considering nonlinearity for consolidation calculations. Finally, three cases are compared to reveal the importance of separating the overconsolidation and normal consolidation. Overall, this study concluded that it is inadequate to consider just one consolidation status in calculations, and that the proposed method is more reasonable for guiding construction.

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Section: Nonlinear Compressibilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Finite Element Study on Calculation of Nonlinear Soil Consolidation Using Compression and Recompression Indexes

Chao

Pan

2020

Applied Sciences

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“…In order to reduce the consolidation settlement, prefabricated vertical drains (PVDs) combined with surcharge and vacuum preloading are widely used in practice engineering. PVDs accelerate the consolidation process of soft soil under preloading and vacuum preloading and control the consolidation rate of soft soil, allowing for radial drainage over short drainage paths [4]. is method uses Barron's theory to design the PVD spacing [5,6] and one of the most important parameters for this design is the horizontal coefficient of consolidation of soft soil (c h ).…”

Section: Introductionmentioning

confidence: 99%

Research on Horizontal Coefficient of Consolidation of Vietnam’s Soft Soil

Son

Ngoc

2020

Journal of Engineering

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The horizontal coefficient of consolidation is the most important parameter for designing the improvement of soil soft by prefabricated vertical drains (PVDs) combined with surcharge and vacuum preloading. This paper presents the experimental study on the horizontal coefficient of consolidation (ch) of some soft soils distributed in Vietnam. The ch value was determined by the laboratory test and CPTu dissipation test. The laboratory tests included the Rowe consolidation cell test and constant rate of strain consolidation with radial drainage test. Two types of consolidation laboratory tests were performed. The experimental results indicated that the ch value is always larger than the vertical coefficient of consolidation of soil (cv). The ratio of ch/cv depends on the consolidated pressure, type of soil, and the anisotropy of soil. The ratio of ch/cv is different in different types of soft soil in Vietnam. In the normally consolidated state, the ch/cv ratio ranges from 1.35 to 10.59. It was necessary to choose the ch value at the consolidated stress level for calculating the PVD spacing.

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“…Abuel-Naga et al 2015, Lam et al 2015, Wang et al 2016. Preloading is an old way of dealing with the problem of long-term consolidation in soft soils; however, in practice, this procedure on its own can be considerably time consuming.…”

Section: Introductionmentioning

confidence: 99%

Creep analysis of an earth embankment on soft soil deposit with and without PVD improvement

Rezania

Bagheri

Nezhad

et al. 2017

Geotextiles and Geomembranes

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In this paper, an anisotropic creep constitutive model, namely Creep-SCLAY1S is employed to study the installation effects of prefabricated vertical drains (PVDs) on the behavior of a full scale test embankment, namely Haarajoki embankment in Finland. The embankment was constructed on a natural soft soil with PVD installed to improve the drainage under one half of it. The Creep constitutive model used in this study, incorporates the effects of fabric anisotropy, structure and time within a critical state based framework. For comparison, the isotropic modified Cam clay (MCC) model and the rate-independent anisotropic S-CLAY1S model are also used for the analyses. The numerical predictions are compared with field measurements and the results indicate that the creep model provides an improved approximation of field settlements, and excess pore pressure build-up and dissipations. In addition, the application of two commonly used permeability matching techniques for two dimensional (2D) plane-strain analysis of the PVD problem is studied and the results are discussed highlighting their limitations and advantages.

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Design chart for prefabricated vertical drains improved ground

Cited by 16 publications

References 43 publications

Finite Element Study on Calculation of Nonlinear Soil Consolidation Using Compression and Recompression Indexes

Finite Element Study on Calculation of Nonlinear Soil Consolidation Using Compression and Recompression Indexes

Research on Horizontal Coefficient of Consolidation of Vietnam’s Soft Soil

Creep analysis of an earth embankment on soft soil deposit with and without PVD improvement

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