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电渗是一种有效的软基加固技术。电渗过程中,随着土体的排水固结,其电导率会发生明显的变化。利用自行开发的轴对称电渗试验仪开展室内电渗试验,分析电渗过程中土体电导率的变化规律。同时考虑土体电导率的非线性变化特征,发展渗流场与应力应变场耦合的电渗数值分析模型。研究表明:电渗过程中土体内电势分布和电势梯度均会发生变化,考虑电导率变化的数值模型计算结果与试验结果更加接近。数值模拟结果表明电渗处理过程中阳极处沉降最大而阴极处沉降最小;室内试验时,由于阳极处边壁的约束作用,最大沉降则发生在靠近阳极的位置。
Electroosmosis is an effective soft foundation reinforcement technology. During the process of electroosmosis, the conductivity of the soil will change obviously with the consolidation of the soil. Using self-developed axisymmetric electrodialysis tester to carry out indoor electro-osmosis test, the variation regularity of soil electrical conductivity during electroosmosis was analyzed. At the same time, considering the non-linear change characteristics of soil electrical conductivity, the numerical model of electroosmosis coupled with seepage field and stress-strain field is developed. The results show that the potential distribution and the potential gradient change in the soil during the electroosmosis process, and the numerical results of the model considering the conductivity change are closer to the experimental results. The results of numerical simulation show that the settling of the anode is the largest during the electroosmosis treatment and the settling of the cathode is the smallest. In the laboratory experiment, the maximum settlement occurs close to the anode due to the restraint of the anode wall.