Field Test on Consolidation of Hydraulically Filled Sludge via Vertical Gradient Electro-osmotic Dewatering

Zhuang, Yan-Feng

doi:10.1007/s40891-022-00406-x

Cited by 4 publications

(2 citation statements)

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“…Previous studies have investigated many impact factors of electroosmotic consolidation, while few focused on the characteristics of electrode boundaries. 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.…”

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.…”

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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: Introductionmentioning

confidence: 99%

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confidence: 99%