A model for predicting permanent deformation of unbound granular materials

Mohammad Shafiqur Rahman*, Sigurdur Erlingsson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)


A simple model has been proposed to characterise the accumulation of permanent deformation (PD) in unbound granular materials (UGMs) under cyclic loading of variable magnitudes. The model was developed based on multi-stage (MS) repeated-load triaxial (RLT) tests. The material parameters of this model can be evaluated using an MS RLT test. The model was validated by calibrating it for a few UGMs with a range of grain size distributions, moisture contents and degrees of compaction. The calibrated model was further validated by predicting the PD behaviour of some of these UGMs for different stress conditions. Generally, quite satisfactory predictions were obtained with this model with the advantage of reduced effort required for its calibration compared to some existing models. Additionally, the sensitivity of the parameters of this model to moisture, degree of compaction and grain size distribution was investigated with the aim of incorporating them into the model in future.

Original languageEnglish
Pages (from-to)653-673
Number of pages21
JournalRoad Materials and Pavement Design
Issue number3
Publication statusPublished - 3 Jul 2015

Bibliographical note

Publisher Copyright:
© 2015 Taylor & Francis.

Other keywords

  • grain size distribution
  • model
  • moisture
  • multi-stage repeated-load triaxial test
  • permanent deformation
  • unbound granular materials


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