Spatially Varying Small-strain Stiffness in Soils Subjected to KLoading

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KSCE Journal of Civil Engineering, ISSN: 1976-3808, Vol: 22, Issue: 4, Page: 1101-1108

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Hyun Ki Kim; J. Carlos Santamarina
Springer Nature
Engineering; spatial variability; effective stiffness; K0 coefficient; uniaxial compaction; zero-lateral strain loading
article description
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 Kthan 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.