Numerical Plane-Strain Modelling of Stone Columns: Installation Process, Single and Group Column Behaviour


KELEŞOĞLU M. K., Durmus C.

KSCE JOURNAL OF CIVIL ENGINEERING, vol.26, pp.3402-3415, 2022 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 26
  • Publication Date: 2022
  • Doi Number: 10.1007/s12205-022-1671-3
  • Journal Name: KSCE JOURNAL OF CIVIL ENGINEERING
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Compendex, INSPEC, Pollution Abstracts
  • Page Numbers: pp.3402-3415
  • Keywords: Stone columns, Plane strain conversion, Single and group behaviour, Numerical models, Embankments, VERTICAL DRAINS, SMEAR ZONE, EMBANKMENTS, BENEATH
  • Istanbul University Affiliated: No

Abstract

The scope of this paper is to emphasize the critical issues related to the axisymmetric and plane-strain modelling of single and group of stone columns constructed to stabilise soft soils. A simple technique based on the expansion of the column shaft was used to simulate the column installation so that the excess pore pressures during this process were calculated for a single column under axisymmetric conditions. Classical cavity expansion theory was also used for the same purpose. The group behaviour of stone columns was discussed by two-dimensional plane-strain numerical models. Plane-strain modelling of stone columns should consider the conversion of stiffness and the drainage properties of the columns and the soft soils to the plane-strain conditions. The validity of two different conversion methods based on the equivalent plane-strain stiffness and equivalent plane-strain permeability coupled with the expansion of the column shaft technique were investigated. An existing well-documented centrifuge test data were used as a reference for numerical models of axisymmetric single column and plane-strain column groups. The measured and calculated results were in good agreement for the case where the finite element model was constituted based on the equivalent plane-strain permeability. The results of this study intend to bring insight to the plane-strain modelling of a group of stone columns.