Prediction of Permanent Deformations in Pavements Using a High-Cycle Accumulation Model

by T. Wichtmann, (corresponding author), Research Assistant; Institute of Soil Mechanics and Rock Mechanics, Univ. of Karlsruhe, Engler-Bunte-Ring 14, 76131 Karlsruhe, Germany, torsten.wichtmann@ibf.uka.de,
H. A. Rondón, Research Assistant; Dept. of Civil and Environmental Engineering, Los Andes Univ., Bogotá D.C., Colombia., h-rondon@uniandes.edu.co,
A. Niemunis, Research Assistant; Institute of Soil Mechanics and Rock Mechanics, Univ. of Karlsruhe, Engler-Bunte-Ring 14, 76131 Karlsruhe, Germany., andrzej.niemunis@ibf.uka.de,
Th. Triantafyllidis, Professor and Director; Institute of Soil Mechanics and Rock Mechanics, Univ. of Karlsruhe, Engler-Bunte-Ring 14, 76131 Karlsruhe, Germany., triantafyllidis@ibf.uka.de,
A. Lizcano, Professor; Dept. of Civil and Environmental Engineering, Los Andes Univ., Bogotá D.C., Colombia., alizcano@uniandes.edu.co,


Serial Information: Issue 5, Pg. 728-740


Document Type: Journal Paper

Abstract: The present paper discusses the application of a high-cycle accumulation (HCA) model originally developed for sand for the prediction of permanent deformations in an unbound granular material (UGM) used for base and subbase layers in pavements. Cyclic triaxial tests on precompacted samples of an UGM have been performed in order to validate and calibrate the model. The stress amplitude, the initial density, and the average stress were varied. The test results are compared to those of air-pluviated samples of sand (subgrade material). Some significant differences in the behavior of both materials under cyclic loading are outlined. It is demonstrated that the functions describing the intensity of accumulation can be maintained for an UGM with different material constants, but that the flow rule must be generalized in order to describe the anisotropy. Recalculations of the laboratory tests show a good prediction of the modified HCA model.

Subject Headings: Material properties | Model tests | Deformation (mechanics) | Pavements | Granular materials | Triaxial tests | Construction materials | Cyclic tests | Base course | Soil deformation |

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