Strength envelope of granular soil stabilized by multi-axial geogrid in large triaxial tests

A. S. Lees*, J. Clausen

*Corresponding author for this work

Research output: Contribution to journalComment/debateResearchpeer-review

15 Citations (Scopus)

Abstract

Conventional methods of characterizing the mechanical properties of soil and geogrid separately are not suited to multi-axial stabilizing geogrid that depends critically on the interaction between soil particles and geogrid. This has been overcome by testing the soil and geogrid product together as one composite material in large specimen triaxial compression tests and fitting a nonlinear failure envelope to the peak failure states. As such, the performance of stabilizing, multi-axial geogrid can be characterized in a measurable way. The failure envelope was adopted in a linear elastic – perfectly plastic constitutive model and implemented into finite element analysis, incorporating a linear variation of enhanced strength with distance from the geogrid plane. This was shown to produce reasonably accurate simulations of triaxial compression tests of both stabilized and nonstabilized specimens at all the confining stresses tested with one set of input parameters for the failure envelope and its variation with distance from the geogrid plane.

Original languageEnglish
JournalCanadian Geotechnical Journal
Volume57
Issue number3
Pages (from-to)448-452
Number of pages5
ISSN0008-3674
DOIs
Publication statusPublished - Mar 2020

Bibliographical note

Publisher Copyright:
© 2020, Canadian Science Publishing. All rights reserved.

Keywords

  • Constitutive model
  • Geogrid
  • Granular materials
  • Large triaxial test
  • Numerical modelling

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