Modelling undrained behaviour of sand with fines and fabric anisotropy

0550094 - ÚT 2023 RIV DE eng J - Journal Article
Rahman, M. - Dafalias, Yannis F.
Modelling undrained behaviour of sand with fines and fabric anisotropy.
Acta Geotechnica. Roč. 17, č. 6 (2022), s. 2305-2324. ISSN 1861-1125. E-ISSN 1861-1133
R&D Projects: GA MŠMT(CZ) EF15_003/0000493
Institutional support: RVO:61388998
Keywords : constitutive model * critical state * dilatancy state parameter * fabric anisotropy * fines * liquefaction * plasticity * sand * state parameter
OECD category: Mechanical engineering
Impact factor: 5.7, year: 2022
Method of publishing: Limited access
https://link.springer.com/article/10.1007/s11440-021-01410-7

Fabric anisotropy and fines content (f(c)) in sands modify significantly their mechanical behaviour, particularly as related to static liquefaction under undrained conditions. The fabric anisotropy aspect, expressed by means of an evolving fabric tensor F, has been addressed in the recently developed Anisotropic Critical State Theory (ACST) that enhances the two critical state conditions on stress ratio (eta) and void ratio (e) of the classical Critical State Theory by an additional condition on the critical state value of F in relation to loading direction, based on this concept it introduces the dependence of dilatancy on fabric anisotropy. Various models have been successfully developed within this framework for clean sands. The f(c) aspect has been addressed within the Equivalent Granular State Theory (EGST) that substitutes a properly defined equivalent granular void ratio (e*) for e in any model for clean sand in order to obtain the response of sand with fines without any other change of the model structure and constants. Along these lines, a constitutive model is constructed in this work in order to address the effect of both F and f(c) simultaneously, by a combination of these two powerful propositions. The idea is very simple: one takes a constitutive model developed within ACST for clean sands, hence it accounts for fabric anisotropy, and substitutes the e* for e, as well as the derivative quantities of such substitution, hence it accounts for f(c). The result yields a model that can simulate data on the undrained response for a range of f(c), with emphasis on static liquefaction. It is shown that the inclusion of fabric anisotropy improves previous similar simulations made within the EGST but without the framework of ACST.
Permanent Link: http://hdl.handle.net/11104/0327717