Vibratory compaction significantly affects the construction quality of the subgrade in the road construction. Establishing a numerical analysis model for the subgrade compaction process helps visualize the compaction process and enhances the quality of compaction for the subgrade. Nowadays, such nonlinear characteristics between the vibratory roller and subgrade could be captured by establishing numerical simulation methods via finite element analysis, which effectively reduces the difficulty of the solution. In these methods, however, the elastoplastic model for the subgrade material tends to ignore the plastic accumulation characteristics of the soil under cyclic loading. Aiming at this problem, a finite element simulation method is proposed for the compaction process of subgrade. In the method, a bounding surface model considering plastic accumulation effect under cyclic loading is used for modelling the compacted soil material. Consequently, a three-dimensional finite element simulation model of drum-soil was established by using UMAT in the secondary development of ABAQUS. Compared with experimental data and popular models like the modified Cambridge model, the DruckerPrager criterion and the Mohr-Coulomb model, the finite element simulation method in this study demonstrates higher accuracy in terms of soil stress, settlement and drum acceleration, confirming its effectiveness. Finally, the dynamic changes in stress and strain during the compaction and the effects of the excitation forces on compaction were analyzed by the finite element simulation method.

来源平台：CONSTRUCTION AND BUILDING MATERIALS