Observed Behaviour of Laterally Expanded Stone Column in Soft Soil
FRIKHA ; BOUASSIDA ; CANOU
Type de document
ARTICLE A COMITE DE LECTURE NON REPERTORIE DANS BDI (ACLN)
Langue
anglais
Auteur
FRIKHA ; BOUASSIDA ; CANOU
Résumé / Abstract
The paper describes the behavior of remolded kaolin clay reinforced by stone column as investigated in laboratory. The installation of stone column was simulated by performing lateral expansion at different rates within hollow cylindrical remolded kaolin specimens initially subjected to K0 consolidation path. These specimens were, then, subjected to classical consolidated undrained triaxial tests while recording excess pore pressure values. The objective of the experimental programme was to quantify the effects of consolidation stress and stone column on the undrained Young's modulus and shear strength of kaolin clay. Obtained results showed a significant improvement in Young's modulus when the cavity expansion ratio and the consolidation stress increase. It was also found that the increase in undrained shear strength of improved kaolin clay mainly occurred at lower consolidation stress. Another important finding of this study is that the ratio of undrained Young's modulus to undrained shear stress increases when the consolidation stress decreases. Finally, the paper presents a model developed for the design of stone columns.
Source
Geotechnical and Geological Engineering, num. 2, pp. 739-752 p.
Editeur
SPRINGER
