This paper describes an analytical design method based on the shakedown approach that utilizes test results from the repeated load triaxial apparatus to establish the risk level of permanent deformations in the UGM-layer. In order to model the permanent and resilient deformation behaviour of UGM-layers in pavement constructions the non-linear "DRESDEN" stress-strain relationship was used. The relationship was then implemented into a Finite Element Program (FENLAP) which was used to check, using a part of the German pavement design guidelines, whether the critical shakedown stress level for the UGM-layer (between stable and unstable behaviour) was exceeded using different UGMs (Sandy Gravel and Granodiorite) for the granular base layer. It was concluded that this method could provide a powerful material assessment and pavement design tool for unbound pavement bases. (Author/publisher) For the covering entry of this conference, please see ITRD abstract no. E208431.
Abstract