Analytical solution for one-dimensional vertical electro-osmotic drainage under unsaturated conditions

Wang, Liujiang; Wang, Yaoming; Liu, Sihong; Fu, Zhongzhi; Shen, Chong; Yuan, Wei‐Hai

doi:10.1016/j.compgeo.2018.09.011

Cited by 25 publications

(4 citation statements)

References 28 publications

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“…the combined use with surcharge and vacuum preloading [15], non-linear properties of soil [16], and the decrease of effective voltage [18,19]. These models have made a significant contribution to the understanding of electro-osmotic performance.…”

Section: Introductionmentioning

confidence: 99%

Semi-analytical solution for one-dimensional coupling consolidation of original soil and electro-osmotic layer using horizontal electrodes

Li,

Luo,

Chen

2024

IOP Conf. Ser.: Earth Environ. Sci.

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The application of horizontal electro-kinetic geosynthetics for electro-osmotic consolidation is becoming increasingly widespread. Such horizontal electrodes are typically arranged at intervals, allowing pore water in original soil to pass through the intervals and penetrate into the electro-osmotic layer. In this study, a one-dimensional semi-analytical solution for a double-layered electro-osmotic system incorporating the original soil was presented and verified. The effects of the soil properties on the consolidation process were investigated. Results revealed that original soil can achieve a significant consolidation effect, even better than electro-osmotic dredged soil. A smaller permeability coefficient of original soil significantly prolongs the consolidation time, while a thicker original soil can improve the average consolidation effect of the two layers. The proposed model provides new electrode arrangement ideas and theoretical support for horizontal electro-kinetic geosynthetics for electro-osmotic reinforcement.

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Section: Introductionmentioning

confidence: 99%

Semi-analytical solution for one-dimensional coupling consolidation of original soil and electro-osmotic layer using horizontal electrodes

Li,

Luo,

Chen

2024

IOP Conf. Ser.: Earth Environ. Sci.

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“…Research studies have been conducted on the effectiveness of EO in consolidating soft soils, providing a sound understanding of consolidation mechanism for engineering applications (Lo et al, 1991;Micic et al, 2001;Citeau et al, 2011;Zhang et al, 2017;. These studies have explored various facets, including electroosmotic theory (Hu et al, 2010;Wang et al, 2019), pH influences (Hu et al, 2019), chemical grouting (Ou et al, 2015;Zhang et al, 2017;Xue et al, 2018;Du et al, 2022), combined applications with other methods (Deng and Zhou, 2016;Wang et al, 2016;Zhou and Deng, 2019;, and both theoretical and numerical simulations (Matteo et al, 2017;Zhang and Hu, 2022;Zhou et al, 2022). In recent years, research has focused on emerging areas, including the bio-inspired heavy metal immobilization method and the enzyme-induced carbonate precipitation method.…”

Section: Introductionmentioning

confidence: 99%

Effects of electrode materials and potential gradient on electro-osmotic consolidation for marine clayey soils

Jin,

Zhang,

Wang

et al. 2024

Front. Earth Sci.

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This study conducted experimental investigations into the effects of electrode material and potential gradient on the effectiveness of electro-osmotic consolidation (EO) in strengthening soft soils. Seven laboratory tests were conducted on high-water-content marine clayey soils through EO. In these experimental tests, four different types of electrodes made of steel, copper, aluminum, and composite carbon fiber (CCF) were employed in four tests each to evaluate the consolidation effectiveness. Additionally, four tests, one was the comparitive study for different eletrode materials, were carried out to determine the optimal gradient for the EO using CCF electrode. Several critical properties of the tested soils were examined and evaluated in this study, including the effective voltage utilization, potential distribution, water discharge, discharge rate, energy consumption, and soil bearing capacity. The test results indicated that the CCF electrode had superior performance in water discharge, discharge rate, and average soil water content compared to metal electrodes. Furthermore, CCF led to uniform enhancement of soil strength, with treated soil bearing capacities 6.3 to 12 times higher than initial values, and 1.9 to 2.5 times higher than those attained with metal electrodes. Additionally, an effective potential gradient of 1 V/cm was identified for the EO with the CCF electrode, providing a higher discharge rate and a larger soil strength in a uniform distribution. Moreover, the use of CCF electrode significantly reduced corrosion compared to metal electrodes during the consolidation process, further contributing to improved consolidation efficiency. This study offers valuable insights and recommendations for the utilization of CCF in marine clayey soils, effectively addressing the challenges posed by electrode corrosion and high energy consumption in EO applications.

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“…e electroosmotic consolidation model considering the change of saturation is proposed [13], which makes the calculation results closer to the real situation. On the basis of the above saturation changes, the large deformation theory is introduced to improve the influence of soil properties changes in the process of electroosmotic consolidation by Deng and Zhou [14] and Zhou et al [15][16][17]; the change of soil saturation also attracted the attention of Wang et al [18]. In the twodimensional model, the vacuum preloading method was introduced into the electroosmotic consolidation model, and the governing equation of this case was given and solved analytically by Wang et al [19].…”

Section: Introductionmentioning

confidence: 99%

Study on Electroosmosis Consolidation of Punctiform Electrode Unit

Yang

Xie

Dong

et al. 2021

Advances in Materials Science and Engineering

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In the electroosmosis method, when the distance between the opposite electrode and the same electrode is equal, the two-dimensional effect of electroosmotic consolidation is significant, and the use of one-dimensional model will overestimate the potential gradient, making the calculated pore pressure value too large. Aiming at this problem, according to the electrode arrangement rule and the minimum composition, a punctiform electrode unit model is proposed, and electroosmotic experiments are carried out on the symmetric and asymmetric unit models. The two-dimensional electroosmotic consolidation governing equation of the punctiform electrode unit is established. The electric potential field of the electrode unit and the finite element form of the electroosmotic consolidation equation are given by the Galerkin method. The PyEcFem finite-element numerical library is developed using Python programming to calculate. The research results show the following: (1) The two-dimensional effect of the potential field distribution of the punctiform electrode unit is significant. The reduction of spacing of the same nature electrode in the symmetrical unit can make the potential distribution close to a uniform electric field. The asymmetry prevents the electric potential field distribution from being reduced to a one-dimensional model. (2) The number of anodes will affect the electroosmosis effect of the soil. The more the anodes, the better the electroosmosis reinforcement effect of the soil, and the distribution of negative excess pore water pressure will be more uniform. (3) In the early stage of electroosmosis, the more the drainage boundaries, the faster the generation of negative pore pressure, but in the middle and late stages of electroosmosis, the potential value becomes the decisive factor, and the amplitude of negative pore water pressure in asymmetric units is higher than that in symmetric units. The potential distribution will not affect the degree of consolidation but will affect the extreme pore water pressure.

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Analytical solution for one-dimensional vertical electro-osmotic drainage under unsaturated conditions

Cited by 25 publications

References 28 publications

Semi-analytical solution for one-dimensional coupling consolidation of original soil and electro-osmotic layer using horizontal electrodes

Semi-analytical solution for one-dimensional coupling consolidation of original soil and electro-osmotic layer using horizontal electrodes

Effects of electrode materials and potential gradient on electro-osmotic consolidation for marine clayey soils

Study on Electroosmosis Consolidation of Punctiform Electrode Unit

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