Effects of Electroosmosis on Soil Temperature and Hydraulic Head. I: Field Observations

Chen, Jiann‐Long; Al-Abed, Souhail R.; Roulier, M. H.; Ryan, James A.; Kemper, Mark

doi:10.1061/(asce)0733-9372(2002)128:7(588)

Cited by 3 publications

(8 citation statements)

References 13 publications

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“…The typical diagrams of the 1D electroosmotic consolidation model in layered soil systems are presented in Figure 1. The model is developed by conceptualizing the two typical horizontal electrode scenarios: horizontally laid electro‐kinetic geosynthetics 20,21 and hydraulic fracture filled with well‐sorted granular graphite 33,35 . The cathode (−) and anode (+) electrodes are horizontally installed in the middle of the soil mass.…”

Section: Mathematical Modelmentioning

confidence: 99%

“…The model is developed by conceptualizing the two typical horizontal electrode scenarios: horizontally laid electro-kinetic geosynthetics 20,21 and hydraulic fracture filled with well-sorted granular graphite. 33,35 The cathode (−) and anode (+) electrodes are horizontally installed in the middle of the soil mass. A voltage gradient is generated between the cathode and anode by applying direct current, inducing vertical electroosmosis flows.…”

Section: Model Descriptionmentioning

confidence: 99%

“…This means that the backfilled soil will be filled back above the upper electrodes. Moreover, the soil below the lower electrodes is normally not an impervious layer or bedrock, but rather could be one with high water content (termed as bottom unelectroosmotic layer) 35,36 . Thus, the backfilled and unelectroosmotic layers inevitably affect the consolidation process of the electroosmotic layer.…”

Section: Introductionmentioning

confidence: 99%

“…During the electroosmosis progress, the pore water can readily pass through the electrodes or their gaps, flowing freely between the electroosmotic and unelectroosmotic layers, due to the relatively high porosity of graphite and the interval arrangement of strip electrodes. 31,32,35 While the previous works normally simplified the cathode and anode as completely permeable and impermeable boundaries, respectively, since the electrodes were assumed to be installed at the two ends of the soil mass. In practical consolidation processes using horizontal electrodes, to ensure tighter contacts between the electrodes and the soil, reducing interfacial resistance, both sides of the electrodes should be surrounded by soil.…”

mentioning

confidence: 99%

“…Moreover, the soil below the lower electrodes is normally not an impervious layer or bedrock, but rather could be one with high water content (termed as bottom unelectroosmotic layer). 35,36 Thus, the backfilled and unelectroosmotic layers inevitably affect the consolidation process of the electroosmotic layer. However, to the best of our knowledge, there is no analytical model for electroosmotic drainage considering the effects of these layers.…”

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confidence: 99%

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Analytical models for electroosmotic consolidation of layered soil systems considering the boundary effects of horizontal electrodes

Li,

Chen,

Zhuang

et al. 2024

Num Anal Meth Geomechanics

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The pore water can usually flow through the horizontal electrodes, resulting in the top sand layer and the bottom unelectroosmotic layer inevitably affecting the consolidation process of the electroosmotic layer. However, the traditional assumption of the fully drained or undrained electrode boundaries is unable to reflect these boundary effects. In this study, one‐dimensional analytical models for electroosmotic consolidation of the layered soil systems considering the boundary effects of horizontal electrodes are proposed. The solutions for the models are derived using the separate variable method and Laplace transform method. The rationality of the one‐dimensional model is also illustrated by comparing it with the results produced by the two‐dimensional model and the accuracies of the solutions are verified through a series of analytical and numerical validation examples. Parametric studies are conducted to investigate the effects of the sand layer and the unelectroosmotic layer on the consolidation process. Results show that both the sand layer and the unelectroosmotic layer may significantly delay the consolidation progress. The time factor corresponding to 90% average degree of consolidation (Tv_90%U*) can increase by over 1.5 times in comparison with the model without a sand layer when the permeability coefficient ratio of the subsoil to the upper layer reaches 10. The delayed effect is particularly pronounced when the thickness of the unelectroosmotic layer with higher compressibility is relatively larger, potentially resulting in a tenfold or even greater increase in Tv_90%U*.

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Section: Mathematical Modelmentioning

confidence: 99%

Section: Model Descriptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Analytical models for electroosmotic consolidation of layered soil systems considering the boundary effects of horizontal electrodes

Li,

Chen,

Zhuang

et al. 2024

Num Anal Meth Geomechanics

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Effect of soil layering and interface resistance on electro‐osmotic consolidation of layered soils: A Green's function approach

Chen,

Li,

et al. 2024

Num Anal Meth Geomechanics

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During electro‐osmotic consolidation, effective voltage attenuation induced by the increasing interface resistance is an important phenomenon, which significantly decreases consolidation effectiveness. This paper presents an analytical model for one‐dimensional electro‐osmotic consolidation in layered soils with horizontal graphite electrodes considering effective voltage attenuation. The mathematical model is characterized by time‐dependent source term and discontinuous interface flux. New variables are introduced to homogenize the discontinuous interface flux and Green’s function method is used to solve the new nonhomogeneous governing equations with nonhomogeneous boundaries. Several verification examples are conducted using the existing analytical solution and numerical results. Parametric studies indicate that electro‐osmotic consolidation of layered soils cannot be accurately simulated by equivalent homogeneous soil, whether effective voltage attenuation is considered or not. Furthermore, the backflow phenomenon may occur due to effective voltage attenuation, while it may disappear when the anode is placed in the low‐permeability layer. In addition, the optimal arrangement of electrodes in layered soils is also investigated. When the ratio of the thickness of low‐permeability layer to high‐permeability layer is about 1/3, installing the cathode in the low‐permeability layer can improve the electro‐osmosis effect up to two times, compared with installing the anode in the low‐permeability layer.

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Effects of Electroosmosis on Soil Temperature and Hydraulic Head. II: Numerical Simulation

et al. 2002

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Effects of Electroosmosis on Soil Temperature and Hydraulic Head. I: Field Observations

Cited by 3 publications

References 13 publications

Analytical models for electroosmotic consolidation of layered soil systems considering the boundary effects of horizontal electrodes

Analytical models for electroosmotic consolidation of layered soil systems considering the boundary effects of horizontal electrodes

Effect of soil layering and interface resistance on electro‐osmotic consolidation of layered soils: A Green's function approach

Effects of Electroosmosis on Soil Temperature and Hydraulic Head. II: Numerical Simulation

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