Title

Nonlinear radial consolidation of vertical drains under a general time-variable loading

RIS ID

89734

Publication Details

Lu, M., Wang, S., Sloan, S. W., Indraratna, B. & Xie, K. (2015). Nonlinear radial consolidation of vertical drains under a general time-variable loading. International Journal for Numerical and Analytical Methods in Geomechanics, 39 (1), 51-62.

Abstract

By incorporating the nonlinear variation of a soil’s compressibility and permeability during the process of consolidation, an analytical solution for the radial consolidation of vertical drains has been developed for a general time-variable loading. The general solution was verified for the cases of instantaneous loading and ramp loading. Detailed solutions were further derived for two special loading schemes: multistage loading and preloading– unloading–reloading. The nonlinear consolidation behavior of a vertical drain subjected to these two types of loading schemes was then investigated by a parametric study. The results show that the loading rate, the ratio of the compressibility index to the permeability index (CdCk) and the initial stress state have a significant influence on the consolidation rate. A smaller value of CdCk a larger initial stress, or a fast loading rate always leads to a rapid consolidation rate. During the unloading period, a negative excess pore water pressure may occur, and a slower unloading rate may reduce this negative value.

Grant Number

ARC/CE110001009, ARC/DP140100509

Please refer to publisher version or contact your library.

Share

COinS