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A platform for research: civil engineering, architecture and urbanism
Numerical analysis of dynamic behavior of Bi-block precast asphalt trackbed for High-Speed railway
Highlights Two types of rubberized asphalt mixture were proposed to prepare the Bi-block precast asphalt trackbed. A three-dimensional finite element model of the bi-block precast asphalt trackbed was developed using the ABAQUS software. The design parameters of the Bi-block precast asphalt trackbed were determined based on the dynamic response.
Abstract In this paper, asphalt trackbed, including the dry-wet hybrid rubberized asphalt mixture (D-WHRAM) trackbed and dry-mixed rubberized epoxy asphalt mixture (DREAM) trackbed, has been proposed. The dynamic response and the design parameters of the proposed trackbed were evaluated by numerical analysis. A three-dimensional finite element model of the bi-block precast asphalt trackbed was developed using the ABAQUS software. The thickness and width of the prepared asphalt mixture cuboid (PAMC) were set as 25 – 40 cm and 85 – 100 cm, respectively. Then, the effects of thickness and width on the structure performance were analyzed according to the dynamic response, including vertical dynamic compressive stress, deformation, acceleration collected from the top of the PAMC, the tensile strain collected from the bottom of the PAMC, and the evolution mechanism of the vertical dynamic compressive stress within the whole subgrade. The results showed that the suitably designed parameters of PAMC for two types of asphalt trackbed were 35 cm in thickness and 100 cm in width. Although the material compositions of the two types of the asphalt trackbed are remarkable, the maximum values of compressive stress on the top of PAMCs were about the same. However, the DREAM trackbed shows a larger dynamic deformation than the D-WHRAM trackbed due to the greater crumb rubber content.
Numerical analysis of dynamic behavior of Bi-block precast asphalt trackbed for High-Speed railway
Highlights Two types of rubberized asphalt mixture were proposed to prepare the Bi-block precast asphalt trackbed. A three-dimensional finite element model of the bi-block precast asphalt trackbed was developed using the ABAQUS software. The design parameters of the Bi-block precast asphalt trackbed were determined based on the dynamic response.
Abstract In this paper, asphalt trackbed, including the dry-wet hybrid rubberized asphalt mixture (D-WHRAM) trackbed and dry-mixed rubberized epoxy asphalt mixture (DREAM) trackbed, has been proposed. The dynamic response and the design parameters of the proposed trackbed were evaluated by numerical analysis. A three-dimensional finite element model of the bi-block precast asphalt trackbed was developed using the ABAQUS software. The thickness and width of the prepared asphalt mixture cuboid (PAMC) were set as 25 – 40 cm and 85 – 100 cm, respectively. Then, the effects of thickness and width on the structure performance were analyzed according to the dynamic response, including vertical dynamic compressive stress, deformation, acceleration collected from the top of the PAMC, the tensile strain collected from the bottom of the PAMC, and the evolution mechanism of the vertical dynamic compressive stress within the whole subgrade. The results showed that the suitably designed parameters of PAMC for two types of asphalt trackbed were 35 cm in thickness and 100 cm in width. Although the material compositions of the two types of the asphalt trackbed are remarkable, the maximum values of compressive stress on the top of PAMCs were about the same. However, the DREAM trackbed shows a larger dynamic deformation than the D-WHRAM trackbed due to the greater crumb rubber content.
Numerical analysis of dynamic behavior of Bi-block precast asphalt trackbed for High-Speed railway
Shi, Chenguang (author) / Sun, Xiaoyin (author) / Wang, Tianling (author) / Wu, You (author) / Liu, Song (author) / Wang, Houzhi (author) / Yang, Jun (author) / Xu, Yang (author) / Qie, Luchao (author)
2022-06-07
Article (Journal)
Electronic Resource
English
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