Spatially varying small-strain stiffness in soils subjected to K0 loading
KAUST DepartmentEarth Science and Engineering Program
Energy Resources and Petroleum Engineering
Physical Sciences and Engineering (PSE) Division
Upstream Petroleum Engineering Research Center (UPERC)
Permanent link to this recordhttp://hdl.handle.net/10754/625728
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AbstractGrain-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.
CitationKim H-K, Santamarina JC (2017) Spatially varying small-strain stiffness in soils subjected to K0 loading. KSCE Journal of Civil Engineering. Available: http://dx.doi.org/10.1007/s12205-017-0547-4.
SponsorsThis research was supported by a grant on Scale Effects in Soils from the National Science Foundation and on Hydrates from the Department of Energy and a grant (13SCIPS04) from Smart Civil Infrastructure Research Program funded by Ministry of Land, Infrastructure and Transport (MOLIT) of Korea government and Korea Agency for Infrastructure Technology Advancement (KAIA).