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

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

doi:10.1061/(asce)0733-9372(2002)128:7(596)

Cited by 8 publications

(8 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Horizontal shrinkage and bubbles in the marine clay increased during electro-osmotic consolidation, which was discussed in "Electrochemical processes" and "Horizontal shrinkage" sections. As a result, the volume (12) www.nature.com/scientificreports/ difference V increased with time, as shown in Fig. 8.…”

Section: Resultsmentioning

confidence: 87%

“…Burnotte et al 11 monitored the temperature of the foundation of soil during an electro-osmotic field test in Canada, and they found that the maximum temperature was 91 °C near the anode. Chen et al 12 observed that the maximum temperature was 42 °C in the electro-osmotic consolidation field test. Therefore, a temperature rise was very obvious in the above two kinds of soils during electro-osmotic consolidation experiments.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, it is also important to analyze the combination of electrochemical-temperature-mechanical processes during the electro-osmotic consolidation of marine clay. Therefore, this paper conducted a series of electro-osmotic consolidation experiments under three durations (12,24, and 48 h) and three voltages (6,9, and 12 V) under k 0 consolidation conditions (i.e., limit the outward lateral deformation of soil). During the electroosmotic consolidation experiments, the current, temperature, settlement, and drainage volume were monitored.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Coupling of electrochemical–temperature–mechanical processes in marine clay during electro-osmotic consolidation

Zou

Yan

Wu-gang

2020

Sci Rep

View full text Add to dashboard Cite

electro-osmotic consolidation has been applied in several geotechnical engineering applications that contain a series of complex processes, including electrochemical processes, temperature changes, and mechanical evolution. to explore the combination of electrochemical-temperature-mechanical processes in marine clay, electro-osmotic consolidation experiments were conducted using a selfmade electro-osmotic consolidation system under various durations and voltages. The following findings was obtained: (1) the change in the pH value increased during electro-osmotic consolidation and as the voltage rise; (2) the temperature increased with a rise in voltage in the initial stage of the experiments, which was induced by Joule heating; (3) the temperature rise promoted the electroosmotic consolidation process, which included a rise in the coefficient of consolidation and a reduction in water content; (4) horizontal shrinkage occurred when the horizontal stress increment was greater than the critical stress condition. In addition, the volume difference reached a constant value, and was proportional to the voltage rise. After the discussion, a coupling analysis was conducted, which can help to better understand the mechanism of electro-osmotic consolidation and can provide reference for engineering applications. Civil engineers attempt to use the offshore reclamation method to satisfy the development requirements of coastal cities. For example, Australia (Brisbane, Queensland) 1 , China (Dalian, Jinzhou Bay) 2 , and Singapore 3 carried out coastal reclamation engineering for city planning purposes. Surcharge preloading and vacuum preloading can both be applied successfully in the area of reclamation. However, these two methods face a long construction period in the development of soft clay because the permeability coefficient of clay is low, which is in the range of 10-8 m/s 4. In comparison, electro-osmotic consolidation is independent of the size of soil particles 5. Direct current causes pore water to move from the anode to the cathode 6. Therefore, electro-osmotic consolidation is an effective method to improve the foundation, slope, and subgrade of soft clay. Electro-osmotic consolidation is a complex process, involving electrochemical processes, temperature changes, and mechanical evolution 5. An electrochemical process is a particularly important process during electro-osmotic consolidation. It is responsible for the electrolysis reaction and the transport of ions. Liaki et al. 8 measured the pH value of clay after different electro-osmotic consolidation treatment durations using a stainless steel anode. They found that the pH value steadily decreased near the anode and increased near the cathode. Xue et al. 9 observed that the pH value of clay near a copper anode was higher than that of a stainless steel anode, which was mainly because the product of chlorine consumed the electric charge and there was not much electric charge on the product of H + in copper anode condition. Wu et al. 10 measured the pH value after ...

show abstract

Section: Resultsmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Coupling of electrochemical–temperature–mechanical processes in marine clay during electro-osmotic consolidation

Zou

Yan

Wu-gang

2020

Sci Rep

View full text Add to dashboard Cite

show abstract

“…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%

“…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.…”

mentioning

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

View full text Add to dashboard Cite

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*.

show abstract

Electroosmotic strengthening of soft clay under different electrification modes

Sun,

Xu,

Zhang

et al. 2024

Energy Science & Engineering

View full text Add to dashboard Cite

Electrification mode is one of the important factors affecting the energy consumption and drainage effect of the electroosmosis method. In this work, a series of laboratory tests were performed to explore the impact of continuous changes in the electric field on the migration of ions and electrons, as well as the migration of electroosmotic flow. The results show that different electrification modes had a significant impact on the current and water discharge. An electrode reversed from anode to cathode, from one circuit to another, is beneficial to drainage, while an electrode reversed from cathode to anode, from one circuit to another, is unfavorable to drainage. The drainage effect of the specific cyclic and progressive electroosmosis (CPE) is not as good as the conventional electroosmosis method. However, combining the two electrification modes can further enhance the shear strength of the soil near a designated electrode. The generation of transverse cracks in soil is mainly due to the drainage difference caused by the electroosmotic flow, which is caused by the adjacent electric field at that location. When the electroosmotic flow is strong, longitudinal cracks will occur in the soil along the strongest electroosmotic flow path. In practical in situ engineering applications, the electrification mode of CPE will be more energy‐efficient than conventional electrification modes with the same processing time.

show abstract

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

Cited by 8 publications

References 13 publications

Coupling of electrochemical–temperature–mechanical processes in marine clay during electro-osmotic consolidation

Coupling of electrochemical–temperature–mechanical processes in marine clay during electro-osmotic consolidation

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

Electroosmotic strengthening of soft clay under different electrification modes

Contact Info

Product

Resources

About