Title

Dynamic characterization and numerical simulation of an unbound granular material

Document Type

Article

Publication Date

1-1-2011

Publication Title

Carreteras

Abstract

In a pavement structure, passing wheel loads impose cyclic stresses consisting of vertical, horizontal and shear components. Studies of the behavior of unbound granular materials (UGM, used for base and sub-base layers) under cyclic loading are mostly performed using the axi-symmetric triaxial test with constant confining pressure (CCP test) and a cyclic variation of the axial stress. However, in this type of test only the vertical component of the cyclic stress path is considered. The oscillation of the horizontal stress can be reproduced by an additional cyclic variation of the confining pressure (VCP test). CCP and VCP tests are sometimes assumed to deliver similar residual and resilient deformations as long as the average stress is the same in both types of tests. However, this assumption is based on limited test data in the literature. The present paper documents a more detailed comparative study with CCP and VCP tests. The results show that only for some special stress paths both types of test deliver similar permanent axial or volumetric deformations. Further experimental results were simulated using an extended Hypoplastic constitutive equation. The simulations performed proved the amply capability of the Hypoplastic equation for to reproduce the behavior of granular materials in cyclic tests.

Volume

4

Issue

175

First Page

6

Last Page

24

ISSN

02126389

Identifier

SCOPUS_ID:79952903546

Documento original

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