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KSCE Journal of Civil Engineering

, Volume 22, Issue 4, pp 1101–1108 | Cite as

Spatially Varying Small-strain Stiffness in Soils Subjected to K0 Loading

  • Hyun-Ki Kim
  • J. Carlos Santamarina
Geotechnical Engineering
  • 71 Downloads

Abstract

Grain-scale characteristics and formation history determine spatial variability in granular masses. We investigate the effect of spatially varying stiffness on the load-deformation response under zero-lateral strain conditions using numerical simulations of correlated random fields, where the granular medium is represented by a non-linear stress-dependent meso-scale model. Results show that stiffness heterogeneity results in higher global compressibility as compared to the homogeneous medium with the same arithmetic mean stiffness. Furthermore, the non-homogeneous stress field that develops inside the granular mass is characterized by focused load transfer along columnar regions, higher stress anisotropy and lower horizontal-to-vertical stress ratio K0 than in a granular medium of homogenous stiffness. As the applied stress increases, the inherent stress-dependent response of the granular material leads to a more homogenous stress field. While greater variance in stiffness causes lower global stiffness, a longer correlation length results in greater variance in global mechanical response among multiple realizations.

Keywords

spatial variability effective stiffness K0 coefficient uniaxial compaction zero-lateral strain loading 

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Copyright information

© Korean Society of Civil Engineers 2018

Authors and Affiliations

  1. 1.School of Civil & Environmental EngineeringKookmin UniversitySeoulKorea
  2. 2.Dept. of Earth Science and EngineeringKing Abdullah University of Science and Technology (KAUST)ThuwalSaudi Arabia

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