Practices for Unbound Aggregate Pavement Layers (2013) / Chapter Skim
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Pages 176-178
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From page 176... ...
176 aPPENDIX E Review of Current Permanent Deformation Models Constitutive relationships often need to be developed to properly describe permanent deformation accumulation in unbound granular materials with number of load applications. In this section, a summary is given of the different models proposed by many researchers to predict permanent strain as a function of load and material property related factors.
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From page 177... ...
177 where ep is the axial permanent strain; N is the number of load application; and a, b, and m are model parameters. The primary feature of Wolff's model is that it accounts for the initial rapid increase in permanent deformation followed by a linear phase in which the permanent deformation increases at a steady rate.
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From page 178... ...
178 Lekarp and Dawson Model Lekarp and Dawson (1998) used the shakedown concept to investigate the effect of stress state on permanent deformation development, and proposed the following model relating the permanent strain accumulation to the maximum shear stress ratio and the length of the stress path: ε p bN L p a q p ref E( )
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