Improved rotational hardening rule for cohesive soils and definition of inherent anisotropy |
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| Authors: | Andrés Nieto Leal Victor N Kaliakin Meysam Mashayekhi |
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| Institution: | 1. Department of Civil Engineering, Universidad Militar Nueva Granada, Cajicá, Colombia;2. Department of Civil and Environmental Engineering, University of Delaware, Newark, U.S.A. |
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| Abstract: | 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, fη and  , 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 fη, the third parameter is inactive. The second new function,  , 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. |
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| Keywords: | bounding surface elastoplasticity fabric of cohesive soils inherent anisotropy rotational hardening rule |
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, 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 fη, the third parameter is inactive. The second new function, 
, 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.