Consolidation theory for prefabricated vertical drains with elliptic cylindrical assumption

Chao-xuan, Huang; Deng, Yue-Bao; Chen, Fei

doi:10.1016/j.compgeo.2016.04.015

Cited by 21 publications

(15 citation statements)

References 16 publications

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“…This phenomenon is known as shape effect of PVD. To consider the shape effect, Huang et al 16 . made an elliptical equivalent assumption, in which the band‐shaped PVD is equivalent to an elliptic cylindrical drain.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear consolidation of soft foundation improved by prefabricated vertical drains based on elliptical cylindrical equivalent model

Tian

Wen

et al. 2021

Num Anal Meth Geomechanics

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This study builds up an elliptical cylindrical equivalent model (ECEM) of prefabricated vertical drains (PVD)‐improved foundation which incorporates the nonlinear variation of compressibility and permeability and the preconsolidate state of soil. An exact solution and a simplified solution are derived for the nonlinear consolidation model under a combined vacuum and surcharge preloading. Considering the stratification of improved soil and the reduction of vacuum pressure along PVD, a precise settlement prediction method is proposed. The rightness and applicability of present solutions are verified by carrying out a series of comparative analyses. Also, a parametric study is conducted to investigate the characteristics of nonlinear consolidation under different Nσ, Cnormalc/Cnormalk, over‐consolidation ratios (OCRs). The results show that, when Cnormalc/Cnormalk=1 the applied load has no impact on the dissipation of excess pore‐water pressure, whereas a larger applied load would induce a quicker settlement rate; the consolidation rate would be underestimated if the over‐consolidated stress history is neglected, and greater OCR produces more obvious underestimation.

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Section: Introductionmentioning

confidence: 99%

Nonlinear consolidation of soft foundation improved by prefabricated vertical drains based on elliptical cylindrical equivalent model

Tian

Wen

et al. 2021

Num Anal Meth Geomechanics

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show abstract

“…Several numerical approaches have been put into practice for displacement prediction and stress and strain analysis of soft foundation improved with prefabricated vertical drains (PVDs) [5][6][7][8][9]. Most of these models are based on the consolidation theory of Barron [10].…”

Section: Introductionmentioning

confidence: 99%

Deformation and Stability of Soft Foundation Improved by Prefabricated Vertical Drains Adjacent to River Bank

2018

Advances in Civil Engineering

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This paper presents a finite element analysis on a soft embankment foundation improved by prefabricated vertical drains. A plane strain analysis was performed using equivalent permeability. The predictions of settlement, pore water pressure, and lateral displacement were compared with the available field measurement data, and a general fair agreement was observed. Numerical results indicate that the settlement below the left part of the embankment is obviously larger than that of the right part. The maximum settlement occurs below the left shoulder of the embankment and reaches 1.26 m. The entire shallow foundation shows a movement trend to the left toe. The designed left embankment shoulder was suggested to be 0.16 m higher than the right side. Monitoring and simulation results demonstrate that the foundation is stable during the construction. The factor of safety at the end of the final loading stage is about 1.81. The performance of the embankment is consistent with the design prescriptions, confirming the effectiveness of the soil improved technique included in this project.

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“…In past research, a cylindrical model has been used to simulate PVDs [24,25]. Huang et al [26] established a settlement equation by constructing a cylindrical model with an elliptical cross section. However, the adoption of an elliptical cross section makes appropriate meshing of PVDs difficult in finite element analysis.…”

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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Consolidation theory for prefabricated vertical drains with elliptic cylindrical assumption

Cited by 21 publications

References 16 publications

Nonlinear consolidation of soft foundation improved by prefabricated vertical drains based on elliptical cylindrical equivalent model

Nonlinear consolidation of soft foundation improved by prefabricated vertical drains based on elliptical cylindrical equivalent model

Deformation and Stability of Soft Foundation Improved by Prefabricated Vertical Drains Adjacent to River Bank

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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