Consolidation of partially saturated ground improved by impervious column inclusion: Governing equations and semi-analytical solutions

Journal of Rock Mechanics and Geotechnical Engineering

Annan Zhou¹  Yongfu Xu²  Xiaohe Xia³  Lei Wang⁴ 

[1] Civil and Infrastructure Engineering Discipline, School of Engineering, RMIT University, Melbourne, 3001, Australia;Department of Civil Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China;Civil and Infrastructure Engineering Discipline, School of Engineering, RMIT University, Melbourne, 3001, Australia;School of Urban Railway Transportation, Shanghai University of Engineering Science, Shanghai, 201620, China;

关键词: Semi-analytical solution;    Consolidation;    Partially saturated soil;    Ground improvement;    Impervious column inclusion;   

DOI  :  

来源: DOAJ

【 摘 要 】

This study focuses on the consolidation behavior and mathematical interpretation of partially-saturated ground improved by impervious column inclusion. The constitutive relations for soil skeleton, pore air and pore water for partially saturated soils are proposed in the context of partially-saturated ground improved by impervious column inclusion. Settlement equation and dissipation equations of excess pore air/water pressures for a partially saturated improved ground are then derived. The semi-analytical solutions for ground settlement and pore pressure dissipation are then obtained through the Laplace transform and validated by the existing solutions for two special cases in the literature and the numerical results obtained from the finite difference method. A series of parametric studies is finally conducted to investigate the influence of some key factors on consolidation of partially saturated ground improved by impervious column inclusion. Based on the parametric study, it can be found that a higher value of the area replacement ratio or modulus of the pile results in a longer dissipation time of excess pore air pressure (PAP), a shorter dissipation time of excess pore water pressure (PWP), and a lower normalized settlement.

【 授权许可】

Unknown