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Spatially Varying Small-strain Stiffness in Soils Subjected to $ K_{0} $ Loading
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 $ K_{0} $ 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.
Spatially Varying Small-strain Stiffness in Soils Subjected to $ K_{0} $ Loading
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 $ K_{0} $ 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.
Spatially Varying Small-strain Stiffness in Soils Subjected to $ K_{0} $ Loading
Kim, Hyun-Ki (author) / Santamarina, J. Carlos (author)
2018
Article (Journal)
English
BKL:
55.80
Verkehrswesen, Transportwesen: Allgemeines, Verkehrswesen, Transportwesen: Allgemeines
/
74.75
Verkehrsplanung, Verkehrspolitik, Verkehrsplanung, Verkehrspolitik
/
55.80
Verkehrswesen, Transportwesen: Allgemeines
/
56.24
Straßenbau, Straßenbau
/
56.24
Straßenbau
/
74.75
Verkehrsplanung, Verkehrspolitik
Spatially Varying Small-strain Stiffness in Soils Subjected to K0 Loading
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