One-dimensional nonlinear consolidation of soft clay with the non-Darcian flow

Li, Chuanxun; Xie, Kongliang

doi:10.1631/jzus.a1200343

Cited by 38 publications

(19 citation statements)

References 11 publications

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“…The test results obtained for samples LB-1 and LB-2 are then used as input. Since the test sample's thickness is small, the effect of Hansbo's flow can be neglected [14] and analysis can be performed based on Darcy's flow; i.e., m = 1.0 or i 1 = 0. The compression index C c , swelling index C s , and secondary consolidation coefficient C α are taken according to the above test results.…”

Section: Verification Of the Experimental Results In This Papermentioning

confidence: 99%

“…Wang et al [9] attributed the deviation to the combined action of gravity water, capillary water, and weak bound water in saturated clay under different hydraulic gradients. Currently, Hansbo's [3] flow theory is most commonly used, and has been applied to one-dimensional [12][13][14][15] and two-dimensional [16] consolidations, as well as sand drains [17], further confirming the necessity of considering non-Darcian flow in the analysis of saturated clay consolidation.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Simulation and Experiment Study on the Characteristics of Non-Darcian Flow and Rheological Consolidation of Saturated Clay

Liu

Xia

Shi

et al. 2019

Water

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To investigate the characteristics of the non-Darcian water flow through saturated clay and one-dimensional rheological consolidation behaviors of the soil in the Henan Province, we conducted constant-head permeability and one-dimensional rheological consolidation tests with one-way drainage using improved permeameter and oedometer tests, respectively. We then used Hansbo’s flow equation to classify the permeability test results and one-dimensional rheological consolidation equation combined with unified hardening (UH) constitutive model considering time effect was introduced to simulate the oedometer test results. The obtained results showed that the improved constant-head permeability test device was suitable for saturated clays, and that the UH constitutive model and Hansbo’s flow equation had good applications for the saturated clays investigated in this experiment.

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Section: Verification Of the Experimental Results In This Papermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Simulation and Experiment Study on the Characteristics of Non-Darcian Flow and Rheological Consolidation of Saturated Clay

Liu

Xia

Shi

et al. 2019

Water

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“…throughout the layer and the specific gravity is 2.61. The constitutive relationships are taken from [25], where 1 = 1.57, 1 =50 kPa, 1 =1 × 10 −8 , =0.6378, and =0.8. The effects of non-Darcian flow are investigated with increasing from 0.75 to 1.5.…”

Section: Influence Of Boundary Conditionsmentioning

confidence: 99%

Numerical Solution of Nonlinear Large Strain Consolidation Based on Non‐Darcian Flow

Zhao

Gong

2019

Mathematical Problems in Engineering

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In this paper, based on non-Darcian flow, the governing equation of 1D nonlinear large strain consolidation is established, which comprehensively accounts for vertical strain, soil self-weight, geometrical nonlinearity, continuity of pore water flow, the relative velocity of the fluid and solid phases, and changing compressibility and hydraulic conductivity during consolidation. Then the numerical solution is obtained with the finite difference method (FDM). Verification of the FDM solution shows excellent accuracy. On this basis, we investigate the influence of the non-Darcian flow on consolidation behavior. The results show that the increase of the non-Darcian exponent will accelerate the consolidation rate in the beginning, while slowing down the consolidation rate in the end. However, it has no effect on the final settlement of the soil layer. In addition, boundary drainage conditions have a huge impact on the consolidation rate, whether it is Darcian or non-Darcian flow.

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“…Moreover, assumption (1) has been already adopted by Pascal et al [16] in the study of consolidation with consideration of a threshold gradient. Similar to the studies [28,29], the differential equation corresponding to equation (33) during the first time interval ΔT v1 can be expressed as follows:…”

Section: Numerical Solutions For the Modelmentioning

confidence: 99%

One-Dimensional Large-Strain Nonlinear Consolidation of Overconsolidated Clays with a Threshold Hydraulic Gradient

Xiao

Yang

et al. 2018

Advances in Civil Engineering

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The existence of the threshold hydraulic gradient in clays under a low hydraulic gradient has been recognized by many studies. Meanwhile, most nature clays to some extent exist in an overconsolidated state more or less. However, the consolidation theory of overconsolidated clays with the threshold hydraulic gradient has been rarely reported in the literature. In this paper, a one-dimensional large-strain consolidation model of overconsolidated clays with consideration of the threshold hydraulic gradient is developed, and the finite differential method is adopted to obtain solutions for this model. The influence of the threshold hydraulic gradient and the preconsolidation pressure of overconsolidated clay on consolidation behavior is investigated. The consolidation rate under large-strain supposition is faster than that under small-strain supposition, and the difference in the consolidation rate between different geometric suppositions increases with an increase in the threshold hydraulic gradient and a decrease in the preconsolidation pressure. If Darcy’s law is valid, the final settlement of overconsolidated clays under large-strain supposition is the same as that under small-strain supposition. For the existence of the threshold hydraulic gradient, the final settlement of the clay layer with large-strain supposition is greater than that with small-strain supposition.

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One-dimensional nonlinear consolidation of soft clay with the non-Darcian flow

Cited by 38 publications

References 11 publications

Numerical Simulation and Experiment Study on the Characteristics of Non-Darcian Flow and Rheological Consolidation of Saturated Clay

Numerical Simulation and Experiment Study on the Characteristics of Non-Darcian Flow and Rheological Consolidation of Saturated Clay

Numerical Solution of Nonlinear Large Strain Consolidation Based on Non‐Darcian Flow

One-Dimensional Large-Strain Nonlinear Consolidation of Overconsolidated Clays with a Threshold Hydraulic Gradient

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