Abstract Electro-osmotic consolidation can be used as a valid and innovative technique for ground improvement. Considering the limitation of previous studies that layered soil heterogeneity was not taken into account, this paper presented an analytical model for one-dimensional(1D) electro-osmotic consolidation of double-layered soil, and a computer program of fully explicit solutions for excess pore pressure and degree of consolidation was developed. In order to validate its accuracy, a series of verification examples were conducted using analytical approach and the finite difference method. Comparison results demonstrated excellent accuracy of the proposed solutions. Furthermore, parametric studies were conducted to investigate the influence of relative permeability and compressibility relationship on the consolidation behavior. It can be found that the differences of hydraulic conductivities and electro-osmosis conductivities in the two layers will lead to a sharp change of the excess pore pressure profiles at the interface of two layers. A larger value of coefficient of volume compressibility in the second layer will slow down the dissipation process of excess pore pressure. A thicker layer with higher compressibility will result in a slower the rate of dissipation of the excess pore pressure, and a thicker layer with higher permeability causes a smaller value of the excess pore pressure, while in the layer of lower permeability, the opposite occurs.

中文翻译：

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双层体系一维电渗固结解析解

摘要 电渗固结可作为一种有效的地基改良创新技术。考虑到以往研究未考虑层状土壤非均质性的局限性，本文提出了双层土壤一维(1D)电渗固结分析模型，以及超孔隙度全显式求解的计算机程序。压力和固结程度得到发展。为了验证其准确性，采用解析法和有限差分法进行了一系列验证实例。比较结果表明所提出的解决方案具有出色的准确性。此外，还进行了参数研究以研究相对渗透率和压缩率关系对固结行为的影响。可以发现，两层水力传导率和电渗传导率的差异会导致两层界面的超孔隙压剖面急剧变化。较大的第二层体积压缩系数值会减慢超孔隙压力的消散过程。压缩率越高的厚层导致超孔隙压的消散速度越慢，渗透率越高的厚层导致超孔隙压值越小，而渗透率低的层则相反。较大的第二层体积压缩系数值会减慢超孔隙压力的消散过程。压缩率越高的厚层导致超孔隙压的消散速度越慢，渗透率越高的厚层导致超孔隙压值越小，而渗透率低的层则相反。较大的第二层体积压缩系数值会减慢超孔隙压力的消散过程。压缩率越高的厚层导致超孔隙压的消散速度越慢，渗透率越高的厚层导致超孔隙压值越小，而渗透率低的层则相反。