Large scale soft ground consolidation using electrokinetic geosynthetics

Zhuang, Yan-Feng

doi:10.1016/j.geotexmem.2020.12.006

Cited by 34 publications

(10 citation statements)

References 12 publications

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“…In the future, the voltage gradient chosen for in situ remediation will depend on the distance between the anode and the cathode. For the larger distance between the electrode plates, the lower voltage gradient of 0.8 V/cm can be recommended for safety reasons [ 56 ]. If the distance between the electrode plates is around 27 cm, then the voltage gradient of 1.0 V/cm can be applied for the shorter time and the higher efficiency of remediation.…”

Section: Resultsmentioning

confidence: 99%

Migration and Removal of Labile Cadmium Contaminants in Paddy Soils by Electrokinetic Remediation without Changing Soil pH

Luan

Zhou

et al. 2022

IJERPH

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Electrokinetic remediation (EKR) is a viable, advanced cleaning strategy that can permanently reduce the toxicity of soil contaminants. However, EKR is prone to causing changes in soil pH. The negative impacts must be minimized if field-scale application is to be realized. In this study, EKR with polarity reversal was used to avoid soil pH polarization and to clean up cadmium (Cd)-contaminated paddy soils. Results showed that Cd desorbed from oxidizable and residual fractions to labile and easily available parts. Soil moisture content above 0.35 g g−1 was conductive to achieving the desirable Cd-migration rate. The exchangeable Cd phase eventually migrated from both ends of that soil compartment towards the intermediate. Moreover, the addition of citric acid at the concentration of 0.1 mol L−1 was an effective enhancement strategy. The methodology enriched Cd contaminants to specific sites. The technology can be used for electrokinetic-assisted phytoremediation during the rice growing period. Hyperaccumulator is planted in the intermediate area to remove the Cd contaminants. On the other hand, Cd removal is achieved in the region close to the electrodes. The present study provides a theoretical basis for in situ remediation. It has a wider significance for field-scale application.

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Section: Resultsmentioning

confidence: 99%

Migration and Removal of Labile Cadmium Contaminants in Paddy Soils by Electrokinetic Remediation without Changing Soil pH

Luan

Zhou

et al. 2022

IJERPH

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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%

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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“…There are numerous soft clayey soils deposited by lakes or rivers in some inland areas of China, and the predominant consolidation methods of these soils include surcharge preloading, 1 vacuum preloading 2,3 and electro‐osmotic 4 . Due to the low permeability and low shear strength of these soils, 5,6 surcharge preloading is ineffective, takes a long time to dewater, and may cause shear damage to the soil 7 . Vacuum preloading is the most widely used method.…”

Section: Introductionmentioning

confidence: 99%

“…4 Due to the low permeability and low shear strength of these soils, 5,6 surcharge preloading is ineffective, takes a long time to dewater, and may cause shear damage to the soil. 7 Vacuum preloading is the most widely used method. However, it is also limited by the hydraulic permeability coefficient of the clay soil and has a slow drainage rate.…”

Section: Introductionmentioning

confidence: 99%

The role of free‐strain assumption in axisymmetric electro‐osmosis‐enhanced preloading consolidation of unsaturated soil

Jiang

Qin

2023

Num Anal Meth Geomechanics

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The axisymmetric, equal‐strain consolidation theory of soil is widely employed in engineering due to the user‐friendliness of its solution. However, the radially averaged excess pore pressure (EPP) is unable to reveal the coupling effect of the radial electric field when the soil is consolidated by electro‐osmotic and surcharge preloading. In this paper, the axisymmetric consolidation analytical models with free strain and equal strain assumptions are developed to investigate the importance of the free strain assumption in the consolidation of unsaturated soil by electro‐osmosis‐aided preloading. The finite Hankel transform, decoupling technique, and Laplace transform are then utilised to derive the semi‐analytical solutions. Finally, the comparison of EPP, surface settlement, and average degree of consolidation under the two assumptions reveals that the free‐strain solution accurately shows the distribution of EPP at any point in the soils and the development of surface settlement at different radii, thus helping to analyse the electro‐osmotic consolidation characteristics. Moreover, it was discovered that electro‐osmosis combined with preloading allows for a more uniform consolidation of unsaturated soil. The difference in the average degree of consolidation under both assumptions is insignificant, while the installation distance of the cathode and anode vertical wells has a significant effect.

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Large scale soft ground consolidation using electrokinetic geosynthetics

Cited by 34 publications

References 12 publications

Migration and Removal of Labile Cadmium Contaminants in Paddy Soils by Electrokinetic Remediation without Changing Soil pH

Migration and Removal of Labile Cadmium Contaminants in Paddy Soils by Electrokinetic Remediation without Changing Soil pH

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

The role of free‐strain assumption in axisymmetric electro‐osmosis‐enhanced preloading consolidation of unsaturated soil

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