Abstract
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.
Highlights
Electroosmosis drainage reinforcement method is a good method to deal with low-permeability soft soil [1]
(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. e potential distribution will not affect the degree of consolidation but will affect the extreme pore water pressure
In 1939, Casagrande [2] applied this method to practical engineering for the first time and achieved success. It had attracted the attention of many scholars and carried out a large number of experimental studies. ese experimental studies mainly focused on the influencing factors of electroosmosis method [3], the characteristics of soil after electroosmosis treatment [4], and how to improve the efficiency of electroosmosis method [5]
Summary
Electroosmosis drainage reinforcement method is a good method to deal with low-permeability soft soil [1]. Sheng et al [20] carried out experimental research on the two-dimensional potential distribution of electroosmotic under the action of plastic electrode plate, and the two-dimensional electroosmotic consolidation was calculated through the measured values. Ese studies improve the theory of electroosmotic consolidation and provide theoretical support for the engineering application of electroosmotic method. E two-dimensional electroosmotic consolidation model based on the idea of partition can only be applied to the electroosmosis with parallel arrangement and cannot be used to calculate the electrode polarity in the case of asymmetry. According to the punctiform electrode unit model, the two-dimensional electroosmotic consolidation equation is established, and the corresponding initial conditions and boundary conditions are given. Ese researches on electroosmotic consolidation of punctiform electrode unit can provide some theoretical support for the engineering application of electroosmotic method Python is used to program the numerical calculation library for solving the electroosmotic consolidation of punctiform electrode unit. e two-dimensional potential field and pore pressure field of electroosmosis are calculated. ese researches on electroosmotic consolidation of punctiform electrode unit can provide some theoretical support for the engineering application of electroosmotic method
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