Modelling electro-osmosis–surcharge preloading combined consolidation of unsaturated soils

Abstract

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

“…Several assumptions related to the mathematical model presented in this research are: The unsaturated soil layer is homogeneous, in which the compression of water or soil particles during consolidation is negligible. The strain occurring in the soil during consolidation is small. Ohm's law and Darcy's law are applicable to the water flow 13,32,33 ; Fick's law is effective for the air flow, 34 and both flows are independent and continuous. The voltage distribution, $$\Phi ( r )$$, is assumed to follow the law of charge conservation in the radial direction, which is independent of time 4,35 The coefficient of volume change, electro‐osmotic permeability k e , 18, 36 and permeability coefficient k a* ( k w* ) are constants 24,26,29 …”

“…This makes the two techniques, electro‐osmosis and surcharge preloading, reinforce each other. However, the soil will change from fully saturated 12 to unsaturated as the water collects toward the cathode during electro‐osmotic consolidation 13 . The electro‐osmosis applications have also been investigated in unsaturated soils, for example: enhancing the stability of slopes, 14 reducing the moisture content of “over‐wet soil fill,” 15 and strengthening the ground 16,17 .…”

“…However, the soil will change from fully saturated 12 to unsaturated as the water collects toward the cathode during electro-osmotic consolidation. 13 The electroosmosis applications have also been investigated in unsaturated soils, for example: enhancing the stability of slopes, 14 reducing the moisture content of "over-wet soil fill," 15 and strengthening the ground. 16,17 Most notably, the theoretical solutions for 1D and 2D consolidation of unsaturated soil with electro-osmosis-aided preloading have been proposed by Zhou et al 13 and Liu et al, 18 respectively.…”

“…13 The electroosmosis applications have also been investigated in unsaturated soils, for example: enhancing the stability of slopes, 14 reducing the moisture content of "over-wet soil fill," 15 and strengthening the ground. 16,17 Most notably, the theoretical solutions for 1D and 2D consolidation of unsaturated soil with electro-osmosis-aided preloading have been proposed by Zhou et al 13 and Liu et al, 18 respectively. The axisymmetric model is, however, more realistic for the arrangement of the electrical vertical drain (EVD) in practical engineering, especially when the cathode EVD is surrounded by multiple anode EVDs.…”

Study on Electroosmosis Consolidation of Punctiform Electrode Unit

“…During the electroosmosis drainage process, the soil gradually changed from the initial saturated state to the unsaturated state, so the saturation changed. 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].…”