Analytical Models
A few material models have been proposed for the development of plastic strains in unbound granular materials in a pavement structure. Lashine et al. (1971), and Barksdale (1972) tested unbound granular material in a repeated load triaxial test for 100 000 cycles. They found that the permanent axial deformation, єpb at different
Fig. 9.4 Example of stress-strain cycles obtained in a repeated load triaxial test on a granular material (Hornych et al., 1998) |
stress states is proportional to number of load cycles, N (Fig. 9.4). Since 1971, many analytical models have been developed and most of them are listed by Lekarp and Dawson (1998).
However, these models have never been used with finite element (FE) calculations except the Hornych model (Hornych et al...
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