Interface Electric Resistance of Electroosmotic Consolidation

Zhuang, Yan-Feng; Zhao, Wei

doi:10.1061/(asce)1090-0241(2007)133:12(1617)

Cited by 38 publications

(11 citation statements)

References 5 publications

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“…This relationship between current and voltage mainly depends on the increase in resistance caused by electro-osmotic dewatering. As one factor, soil near the anode region lost moisture rapidly and formed a hard shell as gas escaped, which greatly increased the interface resistance 17 . Additionally, current attenuation is related to the transmission path in soil.…”

Section: Results and Analysismentioning

confidence: 99%

Electro-osmotic Treatment of Dredged Sediment by Different Power Supply Modes: Energy Consumption and Electro-osmotic Transport Volume

Zheng

Zhu

Xie

et al. 2019

Sci Rep

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Laboratory model tests were conducted in constant-voltage mode and constant-current mode for the one-dimensional electro-osmotic treatment of dredged sediment, with an approximately consistent initial electric power. The voltage, current, drainage rate, electro-osmotic transport volume, and energy consumption coefficient during the electro-osmotic process were measured and calculated. After treatment, the final soil moisture at designated positions in the test samples was measured to investigate the effects of different power supply modes. Further, the divergent phenomena observed with constant voltage and constant current were discussed. Based on an analysis of the measured energy consumption coefficients with time, we obtained a linear relationship between the applied/equivalent voltage and energy consumption coefficient. Furthermore, the electro-osmotic processes are divided into four stages by equal drainage quantity to obtain the energy consumption and electro-osmotic transport volume under different working conditions. The results reveal that the energy consumption of electro-osmosis is mainly determined by the applied voltage or the equivalent voltage for dredged sediment, while the value of electro-osmotic transport volume depends mainly on the change in soil water content rather than power supply modes. The drainage rate in constant-current mode was observed to be relatively steady, maintaining an approximately constant rate until the soil moisture was dramatically reduced. In other words, constant-current mode shows the advantages of being powerful and persistent in electro-osmotic treatment.

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Section: Results and Analysismentioning

confidence: 99%

Electro-osmotic Treatment of Dredged Sediment by Different Power Supply Modes: Energy Consumption and Electro-osmotic Transport Volume

Zheng

Zhu

Xie

et al. 2019

Sci Rep

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“…Numerous laboratory experiments and field tests have been conducted to investigate the development of pore-water pressure and settlement during electroosmotic consolidation, and soil properties such as water content and shear strength after the treatment were measured to evaluate the effect of this technique (Bjerrum et al 1967;Esrig and Gemeinhardt 1967;Lo et al 1991;Lefebvre and Burnotte 2002;Cherepy and Wildenschild 2003;Glendinning et al 2007;Jeyakanthan et al 2011;Wu et al 2015a;Wu et al 2016). Since Casagrande (1949) first applied electroosmotic consolidation to improve the stability of fine soils, this technique has been used often in geotechnical engineering including during slope stabilization, soft ground improvement, tailing dewatering, sludge treatment, and so on (Glendinning et al 2005;Fourie et al 2007;Zhuang and Wang 2007;Jones et al 2008;Wu et al 2015b), and various methods have been proposed to improve its efficiency, such as intermittent current, electrode reversal, moving electrode, and a combination of surcharge and vacuum preloading (Shang 1998;Micic et al 2001;Yoshida et al 1999;Wu and Hu 2012;Zhan et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Analytical Solution for Electroosmotic Consolidation Considering Nonlinear Variation of Soil Parameters

et al. 2017

Int. J. Geomech.

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Electroosmotic consolidation can be used as an efficient technique for soft soil improvement. Considering the limitation in previous theories that soil parameters keep constant during electroosmotic consolidation, the nonlinear relationships between soil compressibility, hydraulic and electroosmosis conductivities, and void ratio are incorporated in a one-dimensional model in the present study. The analytical solutions for the ultimate excess pore-water pressure and surface settlement are derived. A comparison between the proposed analytical solutions and traditional theory indicates that the nonlinear variation of hydraulic conductivity results in a larger ultimate excess pore-water pressure, whereas the nonlinear variation of electroosmosis conductivity leads to a smaller one. The effects are more significant for soils with higher compressibility. The nonlinear variation of soil compressibility exhibits remarkable impact on the development of excess pore-water pressure when the nonlinear variations of hydraulic and electroosmosis conductivities are considered. Compared with the ultimate excess pore-water pressure, the impact of nonlinear variations of soil parameters on the ultimate surface settlement is less significant.

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“…These processes are summarized as the strengthening mechanism of ECT method. materials in the strengthening period [16]. Hu provided a theoretical model for electro-osmotic consolidation using several experimental tests, and also developed a FEM software to describe the process of electro-osmotic consolidation [1].…”

Section: Introductionmentioning

confidence: 99%

Electro-Osmosis Chemical Treatment of High-Salinity Soft Marine Soils: Laboratory Tests

Zhang¹,

Jing²,

Wang³

et al. 2017

TOCIEJ

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Abstract:The electro-osmosis chemical treatment (ECT) is a useful method for improving soil strength. Some laboratory tests on ECT for strengthening high-salinity soft marine soils were investigated using self-designed laboratory facilities in this research. This study focused on improving the mechanical properties by using ECT method and analyzed the effects of using CaCl 2 solution on soil strength owing to the electrolyte is an important factor for improving the bearing capacity of the high-salinity marine soils. Three groups of tests with different time for consolidation were performed to analyze the effective consolidation time on the ECT. In addition, several practical issues, including the current, voltage, energy consumption and the bearing capacity of the treated soils before and after experiments, were considered in the tests. The laboratory tests results demonstrated that the ECT technique is an effective method for improving the high-salinity marine soft soils. Furthermore, the definition of the effective time for consolidation was proposed for the ECT of high-salinity soft marine soils to improve the feasibility and economical efficiency of the ECT. This study provides some references and suggestions for practical application of the ECT technique for marine soft soils.

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Interface Electric Resistance of Electroosmotic Consolidation

Cited by 38 publications

References 5 publications

Electro-osmotic Treatment of Dredged Sediment by Different Power Supply Modes: Energy Consumption and Electro-osmotic Transport Volume

Electro-osmotic Treatment of Dredged Sediment by Different Power Supply Modes: Energy Consumption and Electro-osmotic Transport Volume

Analytical Solution for Electroosmotic Consolidation Considering Nonlinear Variation of Soil Parameters

Electro-Osmosis Chemical Treatment of High-Salinity Soft Marine Soils: Laboratory Tests

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