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Article: DEM simulations of the small strain stiffness of granular soils: effect of stress ratio

TitleDEM simulations of the small strain stiffness of granular soils: effect of stress ratio
Authors
Issue Date2013
Citation
Granular Matter, 2013, v. 15 n. 3, p. 287-298 How to Cite?
AbstractDEM (discrete element method) simulations are carried out to evaluate the small strain stiffness (i.e. Young's modulus and shear modulus) of a granular random packing with focus on the effect of stress ratio (SR). The results show that the Young's modulus in a given direction generally depends on the stress component in that direction. The Young's modulus normalized by the related stress component remains nearly constant when SR is less than a threshold value SRth. When SR is larger than SRth, the normalized Young's modulus decreases, particularly in the minor principle stress direction. Moreover, the Young's modulus during unloading is always smaller than the one during loading at the same stress state, which indicates that the microstructure of the specimen has been modified by the historical shearing process. The shear modulus mainly depends on the mean effective stress and shows similar evolution trend as the Young's modulus. This study finds that the macroscopic stiffness of the specimen is closely related to the evolutions of particle contact number and contact force during shearing. When SR is less than SRth, the specimen only adjusts the distribution of contact forces to resist the external load, without any apparent change of contact number. When SR is larger than SRth, however, the specimen has to adjust both contact number and contact forces to resist the external load. The study also illustrates that there is a good relationship between the macroscopic stiffness anisotropy and fabric anisotropy, and therefore the stiffness anisotropy may be used as an indicator of fabric anisotropy. © 2013 Springer-Verlag Berlin Heidelberg.
Persistent Identifierhttp://hdl.handle.net/10722/188914
ISSN
2015 Impact Factor: 1.74
2015 SCImago Journal Rankings: 1.033
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorGu, Xen_US
dc.contributor.authorYang, Jen_US
dc.contributor.authorHuang, Men_US
dc.date.accessioned2013-09-17T14:20:51Z-
dc.date.available2013-09-17T14:20:51Z-
dc.date.issued2013en_US
dc.identifier.citationGranular Matter, 2013, v. 15 n. 3, p. 287-298en_US
dc.identifier.issn14345021-
dc.identifier.urihttp://hdl.handle.net/10722/188914-
dc.description.abstractDEM (discrete element method) simulations are carried out to evaluate the small strain stiffness (i.e. Young's modulus and shear modulus) of a granular random packing with focus on the effect of stress ratio (SR). The results show that the Young's modulus in a given direction generally depends on the stress component in that direction. The Young's modulus normalized by the related stress component remains nearly constant when SR is less than a threshold value SRth. When SR is larger than SRth, the normalized Young's modulus decreases, particularly in the minor principle stress direction. Moreover, the Young's modulus during unloading is always smaller than the one during loading at the same stress state, which indicates that the microstructure of the specimen has been modified by the historical shearing process. The shear modulus mainly depends on the mean effective stress and shows similar evolution trend as the Young's modulus. This study finds that the macroscopic stiffness of the specimen is closely related to the evolutions of particle contact number and contact force during shearing. When SR is less than SRth, the specimen only adjusts the distribution of contact forces to resist the external load, without any apparent change of contact number. When SR is larger than SRth, however, the specimen has to adjust both contact number and contact forces to resist the external load. The study also illustrates that there is a good relationship between the macroscopic stiffness anisotropy and fabric anisotropy, and therefore the stiffness anisotropy may be used as an indicator of fabric anisotropy. © 2013 Springer-Verlag Berlin Heidelberg.-
dc.languageengen_US
dc.relation.ispartofGranular Matteren_US
dc.titleDEM simulations of the small strain stiffness of granular soils: effect of stress ratioen_US
dc.typeArticleen_US
dc.identifier.emailGu, X: gxq1981@hku.hken_US
dc.identifier.emailYang, J: junyang@hkucc.hku.hken_US
dc.identifier.authorityYang, J=rp00201en_US
dc.identifier.doi10.1007/s10035-013-0407-y-
dc.identifier.scopuseid_2-s2.0-84878689322-
dc.identifier.hkuros221232en_US
dc.identifier.volume15en_US
dc.identifier.issue3en_US
dc.identifier.spage287en_US
dc.identifier.epage298en_US
dc.identifier.isiWOS:000319772000003-

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