Elastoplastic deformation characteristics of gravelly soils

Meng-Chia Weng*, Bin Lin Chu, Yu Ling Ho

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


This study explores the elastoplastic deformational behavior of gravelly soils. A series of drained triaxial tests with controlled stress paths [conventional triaxial compression (CTC) and conventional triaxial extension (CTE)] were conducted using large specimens composed of gravelly soils. Experimental results reveal that the elastic and plastic deformation of gravelly soils exhibits the following characteristics: (1) the elastic shear modulus stiffens under increase of hydrostatic loading; (2) during the CTC tests,plastic deformation occurs before the failure state, and the influence of confining pressure on the plastic strain is insignificant;(3) through the CTE path, the shear strain dominates the plastic deformation; (4) based on the distribution of plastic flows, the gravelly soils follow the nonassociated flow rule; and (5) this study proposes a possible geometry of plastic potential surface for gravelly soil, which includes two parts: an approximately horizontal line and an elliptic surface in the p2 √J2 plane.

Original languageEnglish
Pages (from-to)947-955
Number of pages9
JournalJournal of Geotechnical and Geoenvironmental Engineering
Issue number6
StatePublished - 2013


  • Elastoplastic deformation
  • Gravelly soil
  • Nonassociated flow rule


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