Effect of principal stress rotation on deformation behavior of dense sand-clay mixtures


FEDAKAR H. İ. , Rutherford C. J. , Cetin B.

ROAD MATERIALS AND PAVEMENT DESIGN, 2021 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Publication Date: 2021
  • Doi Number: 10.1080/14680629.2021.1948908
  • Title of Journal : ROAD MATERIALS AND PAVEMENT DESIGN
  • Keywords: Hollow cylinder test, principal stress rotation, triaxial test, deformation, sand-clay mixture, HOLLOW CYLINDER APPARATUS, PERMANENT DEFORMATION, SOFT CLAY, UNDRAINED BEHAVIOR, CYCLIC BEHAVIOR, SUBGRADE SOILS, CRUMB RUBBER, MARINE CLAY, BASE, SUBBASE

Abstract

This paper investigated the deformation behaviour of K-consolidated sand-clay mixtures through cyclic triaxial (CT) and hollow cylinder (CHC) tests. The sand-clay mixtures contained 0%, 5%, 10% and 20% clay by weight and were prepared at a relative density of 75%. Clay inclusion caused an increase in the permanent axial strain of mixtures (0.075% to 5% in CT and 0.186% to 5% in CHC), while a relatively insignificant increase in permanent axial strain was observed in the CT specimens containing 5% and 10% clay (0.075% to 1.299%). However, all CHC specimens with clay failed (epsilon(z) >= 5%). It was also observed that shear strain development of sand is significantly influenced by clay inclusion (0.096-2.241%) in CHC tests. Test results clearly show that the effect of a principal stress rotation should be taken into account to better estimate the deformation behaviour of sand-clay mixtures under repetitive traffic loads.