Abstract The combination of composite foundation with permeable and/or impermeable piles can promote the consolidation process of soft soil. This can enhance the strength of foundation, and has a great practical value for the treatment of soft ground. Based on an axisymmetric consolidation model and the consolidation theory for double-layer ground, the consolidation characteristics of combined composite foundation reinforced by penetrated impermeable columns and partially penetrated permeable columns have been studied. A differential equation, subjected to an instant load, has been established, considering the volume change of the permeable columns. Its analytical solution agrees well with the solutions obtained by using finite element models. Additionally, the main factors influencing the consolidation rate of the combined composite foundation have been analyzed, and the results indicate that the consolidation can be accelerated significantly by lengthening the permeable columns. The consolidation rate increases with increasing the replacement ratio and the permeability and compressive moduli of the soil and columns. For the same conditions, the increase of consolidation rate caused by enlarging the compressive modulus of the upper improved soil is less than that caused by enlarging the compressive modulus of the lower improved soil, while the permeability of the soil has the reverse effect.

中文翻译：

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透水防渗柱和部分透水石柱加固组合复合地基固结解析解

摘要 复合地基与透水和/或不透水桩的结合可以促进软土的固结过程。这样可以增强地基的强度，对软土地基的处理有很大的实用价值。基于轴对称固结模型和双层地基固结理论，研究了透水抗渗柱和部分透水柱加固组合复合地基的固结特性。考虑渗透柱体积变化，建立了瞬时载荷下的微分方程。其解析解与使用有限元模型得到的解非常吻合。此外，分析了影响组合复合地基固结率的主要因素，结果表明加长透水柱可显着加快固结速度。固结率随着置换率的增加以及土和柱的渗透率和压缩模量的增加而增加。在相同条件下，增大上部改良土的压缩模量引起的固结率增加小于增大下部改良土的压缩模量引起的固结率增加，而土的渗透性则相反。固结率随着置换率的增加以及土和柱的渗透率和压缩模量的增加而增加。在相同条件下，增大上部改良土的压缩模量引起的固结率增加小于增大下部改良土的压缩模量引起的固结率增加，而土的渗透性则相反。固结率随着置换率的增加以及土和柱的渗透率和压缩模量的增加而增加。在相同条件下，增大上部改良土的压缩模量引起的固结率增加小于增大下部改良土的压缩模量引起的固结率增加，而土的渗透性则相反。