Strains Comparisons of Unbound Base/Subbase Layer Using Three Elasto-Plastic Models under Repeated Loads

The constitutive model is the crucial part for finite element analyses. To study elasto-plastic properties of unbound granular materials (UGMs) under repeated vehicular loads, an called revised spatially mobilized plane (SMP) was proposed and validated. In this study, SMP used plastic strain analyses a typical three-layer pavement structure. make comparisons, Mohr-Coulomb Druck-Prager models were employed numerical computation. results show that tensile compressive strains in horizontal vertical directions appear on top surface UGM using model, but no are produced by models. distribution had good relationship with actual loading areas loading, which related to rutting. With Druck-Prage models, great during first several cycles hardly increased following cycles, while presented obvious increasing tendency cycles. predicted permanent deformations SMP, 0.557 mm, 0.78 mm 0.155 respectively. Our work reveals may over-predict under-predict rutting early stage proved advantages description UMG loads.