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A platform for research: civil engineering, architecture and urbanism
Vibratory compaction characteristics of the subgrade under cyclical loading based on finite element simulation
Abstract 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 Drucker-Prager 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.
Graphical Abstract Display Omitted
Highlights A finite element simulation method is proposed for the subgrade compaction under cyclic loading. The effectiveness of the simulation method is verified by experiment data and comparisons with commonly used models. The changes of stress and strain and the effects of excitation forces for subgrade are analyzed during the compaction.
Vibratory compaction characteristics of the subgrade under cyclical loading based on finite element simulation
Abstract 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 Drucker-Prager 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.
Graphical Abstract Display Omitted
Highlights A finite element simulation method is proposed for the subgrade compaction under cyclic loading. The effectiveness of the simulation method is verified by experiment data and comparisons with commonly used models. The changes of stress and strain and the effects of excitation forces for subgrade are analyzed during the compaction.
Vibratory compaction characteristics of the subgrade under cyclical loading based on finite element simulation
Jia, Feng (author) / Dong, Fangtao (author) / Ma, Sinuo (author) / Shen, Jianjun (author) / Liu, Zhen (author)
2024-02-07
Article (Journal)
Electronic Resource
English