Moisture migration and electric distribution of unsaturated clay under electro-osmosis with carbon fiber tape as electrode

Tang, Kangwei; Zhang, Feng; Feng, Decheng; Lu, Xin

doi:10.1016/j.enggeo.2021.106404

Cited by 13 publications

(5 citation statements)

References 39 publications

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“…The injection of water into the anode promoted S2-S5 to further drainage until S2 reached the limiting water content (30%±2%). The limiting water content varied with the soil property, electrodes materials, and voltage gradient, as can be seen from the monitoring results of water content given by Tang et al [ 22 ] and Jayasekera [ 7 ]. But it does exist and it affects the movement of EF.…”

Section: Resultsmentioning

confidence: 98%

“…EF varies with time during electrokinetic processes. Numerous determinations were made of the soil real-time water content at different distances from the electrodes, water discharge at various intervals of time, and strength after the treatment in order to study the dewatering process and the soil strengthening effect of electroosmotic treatment [ 3 , 7 , 8 , 22 ]. However, there are still mechanisms that remain to be explained such as the transport trajectory of EF in different soil segments and time stages, and its effect on the increasing process of shear strength.…”

Section: Introductionmentioning

confidence: 99%

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Electroosmotic flow in soft clay and measures to promote movement under direct current electric field

Sun,

Zhang,

Demarscho Eugene

et al. 2024

PLoS ONE

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Electroosmosis has been proposed as a technique to reduce moisture and thus increase the stability of soft clay. However, its high energy consumption and uneven reinforcement effect has limited its popularization and application in practical engineering. This paper presents the results of some electrokinetic tests performed on clayey specimens with different electrification time and anode boundary conditions. The results indicate that the timing of the formation of electroosmotic flow (EF) by the water originally contained in different soil cross sections, from the anode to the cathode, varies. The measuring soil cross section nearest the anode first reached the limiting water content of 22%±3% and electroosmosis had to be stopped. Water injection into the anode during electroosmosis enhanced further drainage of other four measuring soil cross sections until the second soil cross section from the anode reached the limiting water content of 30%±2%. Electroosmosis with water injection into the anode technique provides more uniform reinforcement, increasing EF, and environmental protection. The experimental results highlighted the relevant and expected contribution of water injection into the anode on the effectiveness of the electroosmotic treatment as a soft clay improvement technique.

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Section: Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Electroosmotic flow in soft clay and measures to promote movement under direct current electric field

Sun,

Zhang,

Demarscho Eugene

et al. 2024

PLoS ONE

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“…Within segment k, the original governing equation can be transformed into a standard parabolic partial differential Equation (7).…”

Section: Strategies For Linear Segmentation and Inheritancementioning

confidence: 99%

“…Evaluating the efficiency of electroosmotic drainage from the perspective of energy loss is a new approach that incorporates soil thermal energy and interfacial energy into the evaluation model, which can accurately describe the efficiency of electroosmotic drainage [6]. The electrode material, soil moisture characteristic curve, changes in soil resistance, and pH value all affect the efficiency and energy consumption of electroosmosis [7][8][9][10][11][12]. The electroosmotic permeability coefficient is an important parameter in the electroosmotic consolidation process.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation of One-Dimensional Electroosmotic Consolidation Based on Segment Inheritance Strategy

Yang,

Pei,

Xie

et al. 2024

Advances in Civil Engineering

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The attenuation of effective potential is a significant factor leading to the low postdrainage efficiency in the electroosmotic consolidation and drainage methods. In this study, the influence of the attenuation of effective potential on the electroosmotic consolidation process and the problem of solving the governing equations were investigated. A 102.5-hr one-dimensional electroosmotic consolidation test was performed to monitor the changes in the properties of the soil interior and the soil–electrode interface, and the variation curve of the effective potential in the test model was measured. The time-dependent nature of the potential distribution due to the attenuation of effective potential contradicts the assumption of introducing intermediate variables. To address this key issue, the variation curve of the effective potential was linearly segmented, ensuring the validity of introducing intermediate variables within each local state segment. Based on the continuity between state segments, the initial conditions of the governing equations in different state segments were updated, thereby extending the differential iteration within local state segments to the entire electroosmotic time domain. A finite-difference program for this method was developed using the Python language. Calculations and analyses based on the measured potential data were performed, revealing that a decrease in potential leads to a reduction in the effectiveness of electroosmotic drainage and consolidation in terms of the instantaneous distribution of pore pressure and the overall average degree of consolidation. This method can reflect the influence of the attenuation of effective potential on the pore water pressure during the electroosmotic consolidation process. The research findings of this paper can provide theoretical and numerical support for the improvement and engineering application of the electroosmotic consolidation and drainage method.

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“…In engineering application and experimental research, the electrodes are usually directly inserted into the soil, which allows electroosmosis to be analyzed by real-time changes of water discharge and moisture content of soil [ 20 , 21 ]. Conversely, the evolution of electrophoresis is difficult to judge.…”

Section: Introductionmentioning

confidence: 99%

Electroosmosis and electrophoresis in soft clay under direct current electric field

Sun,

Qing,

Zhang

et al. 2024

Heliyon

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Moisture migration and electric distribution of unsaturated clay under electro-osmosis with carbon fiber tape as electrode

Cited by 13 publications

References 39 publications

Electroosmotic flow in soft clay and measures to promote movement under direct current electric field

Electroosmotic flow in soft clay and measures to promote movement under direct current electric field

Experimental and Numerical Investigation of One-Dimensional Electroosmotic Consolidation Based on Segment Inheritance Strategy

Electroosmosis and electrophoresis in soft clay under direct current electric field

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