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Improved rotational hardening rule for cohesive soils and definition of inherent anisotropy
Author(s) -
Nieto Leal Andrés,
Kaliakin Victor N.,
Mashayekhi Meysam
Publication year - 2017
Publication title -
international journal for numerical and analytical methods in geomechanics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.419
H-Index - 91
eISSN - 1096-9853
pISSN - 0363-9061
DOI - 10.1002/nag.2750
Subject(s) - shearing (physics) , anisotropy , hardening (computing) , bounding overwatch , soil water , geotechnical engineering , plasticity , mathematics , mechanics , geology , computer science , materials science , soil science , physics , layer (electronics) , quantum mechanics , artificial intelligence , composite material
Summary Improved, microfabric‐inspired rotational hardening rules for the plastic potential and bounding surfaces associated with the generalized bounding surface model for cohesive soils are presented. These hardening rules include 2 new functions, f η andfI 0, that improve the simulation of anisotropically consolidated cohesive soils. Three model parameters are associated with the improved hardening rules. A detailed procedure for obtaining suitable values for these parameters is presented. The first 2 parameters affect the simulation of constant stress ratio loading where, because of the presence of f η , the third parameter is inactive. The second new function,fI 0, accelerates the rotation of the plastic potential and bounding surfaces during shearing, which is particularly important for overconsolidated soils tested in extension. This paper also describes the proper manner in which to define the inherent anisotropy. This seemingly straightforward test has rarely been discussed in sufficient detail.