Analytical solution and numerical simulation of vacuum consolidation by vertical drains beneath circular embankments

Indraratna, Buddhima; Kan, Mojtaba E.; Potts, David M.; Rujikiatkamjorn, Cholachat; Sloan, Scott W.

doi:10.1016/j.compgeo.2016.06.008

Cited by 50 publications

(14 citation statements)

References 24 publications

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“…Ho and Behzad [19] realized the limited analysis of the 2D plane strain consolidation system and introduced a closed-form analytical solution to predict the dissipation of excess poreair and pore-water pressures. Indraratna et al [20] derived an analytical solution for vacuum consolidation of a circular foundation, which was validated by an FE model. This numerical model was utilized to analyze the settlement of a test embankment.…”

Section: Foundation Treatment Methods For Ballasted Trackmentioning

confidence: 99%

Review of research on high-speed railway subgrade settlement in soft soil area

2020

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Construction issues of high-speed rail infrastructures have been increasingly concerned worldwide, of which the subgrade settlement in soft soil area becomes a particularly critical problem. Due to the high compressibility and low permeability of soft soil, the post-construction settlement of the subgrade is extremely difficult to control in these regions, which seriously threatens the operation safety of high-speed trains. In this work, the significant issues of high-speed railway subgrades in soft soil regions are discussed. The theoretical and experimental studies on foundation treatment methods for ballasted and ballastless tracks are reviewed. The settlement evolution and the settlement control effect of different treatment methods are highlighted. Control technologies of subgrade differential settlement are subsequently briefly presented. Settlement calculation algorithms of foundations reinforced by different treatment methods are discussed in detail. The defects of existing prediction methods and the challenges faced in their practical applications are analyzed. Furthermore, the guidance on future improvement in control theories and technologies of subgrade settlement for high-speed railway lines and the corresponding challenges are provided.

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Section: Foundation Treatment Methods For Ballasted Trackmentioning

confidence: 99%

Review of research on high-speed railway subgrade settlement in soft soil area

2020

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“…The model size is 64 m × 16.6 m, and the PVDs are simulated by line elements, which are rooted at a depth of 4.5 m, as shown in Fig.1. The behaviors of the soil are assumed to obey the constitutive theory of "Hardening soil" model (Indraratna et al 2016). To determine parameters for the model, laboratory tests were conducted in the Underground Engineering Laboratory at Tianjin University, China.…”

Section: Establishment and Validation Of Conventional Vacuum Preloadimentioning

confidence: 99%

Numerical analysis on ground improvement of vacuum preloading with prefabricated radiant drain

Lei

Feng

Edgard

et al. 2020

JGS Special Publication

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A new technology of vacuum preloading with prefabricated radiant drain (PRD), including prefabricated vertical drain (PVD) and prefabricated horizontal drains (PHD), was proposed in this paper. The validity of numerical model parameter was verified by comparative analysis of deformation development of numerical simulation results and field tests. In addition, two influence factors of PHD spacing and PHD length for vacuum preloading with PRD technique were systematically studied by finite element method. The results show that vacuum preloading with PRD can obviously improve the reinforcement effect of dredged fill ground. Compared with the conventional vacuum preloading, the maximum settlement of vacuum preloading with PRD respectively is increased by 88.94 % and the maximum lateral displacement is 110.4 % at the PHD spacing of 0.5 m. Moreover, reducing the PHD spacing can improve the ground treatment effect. Compared with the PHD spacing of 1.5 m, the maximum settlement respectively is enlarged by 39.93 % and the maximum lateral displacement is increased by 49.4 % for the PHD spacing of 0.5 m. Increasing the PHD length can boost settlement and lateral displacement for the PHD length range of 0.2 m~0.4 m. The settlement and lateral displacement are 38.98 % and 50.3 % higher for the PHD length of 0.4 m than those for a PHD length of 0.2 m.

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“…PVD preloading is an important method to address the problem of uneven settlement of soft soil foundations in the coastal area of South China. The PVD plays an essential role in solving the seepage problem in soft soil foundation engineering [1][2][3][4][5]. Construction projects involving soft soil foundations in the coastal area of South China are increasing [6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Stochastic Medium Model for the Settlement Calculation of Prefabricated Vertical Drains of Soft Soil Foundations in the Coastal Area of South China

Liu

Gao

Zhou

2022

JMSE

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The prefabricated vertical drain (PVD) is an essential means to mitigate the settlement of soft soil foundations in coastal areas of South China. The commonly used elastoplastic analytical method cannot directly reflect the interaction of different PVDs and the resulting displacement of soft soil. At the same time, these elastoplastic analysis and numerical simulation methods are greatly influenced by the values adopted for rock and soil material parameters. In this paper, we present a stochastic medium model that can directly reflect the interaction of different PVDs and the resulting displacement of soft soil. It is not affected by the characteristics of rock and soil themselves and can also reflect the actual deformation process of soft soil. According to engineering practice, the settlement curves of soft soil foundations in coastal areas of South China with PVDs exhibited distinct normal distribution characteristics, which was consistent with the description of settlement by the stochastic medium model. Hence, based on the stochastic medium model, this paper analyzed the settlement mechanism of PVDs and established a stochastic medium model for the settlement calculation of PVDs. A function for the soft soil foundation in the coastal area of South China cross-section settlement curve was presented by back analysis of the PVD model. We chose the stochastic medium model based on this methodology to explore the interaction between different PVDs. The above models were then applied to an expressway in South China. Comparing actual settlement monitoring values to calculated values obtained with the PVD model, the error between the two models was less than 15%. This research provides a new settlement calculation method of PVDs in soft soil foundations in the coastal area of South China and a new basis for designing soft soil foundations.

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Analytical solution and numerical simulation of vacuum consolidation by vertical drains beneath circular embankments

Cited by 50 publications

References 24 publications

Review of research on high-speed railway subgrade settlement in soft soil area

Review of research on high-speed railway subgrade settlement in soft soil area

Numerical analysis on ground improvement of vacuum preloading with prefabricated radiant drain

Stochastic Medium Model for the Settlement Calculation of Prefabricated Vertical Drains of Soft Soil Foundations in the Coastal Area of South China

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