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A platform for research: civil engineering, architecture and urbanism
Discrete element modeling of polyurethane-stabilized ballast under monotonic and cyclic triaxial loading
https://orcid.org/0000-0003-1527-6619
Highlights The triaxial test was conducted for the polyurethane-stabilized ballast using DEM. Obtain the shear strength parameters of the polyurethane-stabilized ballast. Reveal the influence of frequencies and amplitudes of train loads.
Abstract A series of triaxial tests were conducted using the discrete element method to investigate the shear strength and deformation of the polyurethane-stabilized ballast with different dosages of polyurethane binder. The results show: The shear strength and Poisson’s ratio of the polyurethane-stabilized ballast increase with the dosage of polyurethane binder. The cohesion and internal friction angle of the polyurethane-stabilized ballast improve linearly with the increase of the polyurethane dosage. The deformation of the polyurethane-stabilized ballast also increases with the loading frequency while the deformation almost keeps stable after 40 Hz. The deformation of the polyurethane-stabilized ballast increases with the loading amplitude. The plastic collapse of the polyurethane-stabilized ballast with a lower polyurethane dosage occurs under a higher loading amplitude. Compared with the loading frequency, the loading amplitude has a more significant effect on the deformation of the polyurethane-stabilized ballast. The hoop effect exists in the polyurethane-stabilized ballast and the lateral expansion is constrained. The hoop effect is strengthened with the increase of the polyurethane dosage.
Discrete element modeling of polyurethane-stabilized ballast under monotonic and cyclic triaxial loading
https://orcid.org/0000-0003-1527-6619
Highlights The triaxial test was conducted for the polyurethane-stabilized ballast using DEM. Obtain the shear strength parameters of the polyurethane-stabilized ballast. Reveal the influence of frequencies and amplitudes of train loads.
Abstract A series of triaxial tests were conducted using the discrete element method to investigate the shear strength and deformation of the polyurethane-stabilized ballast with different dosages of polyurethane binder. The results show: The shear strength and Poisson’s ratio of the polyurethane-stabilized ballast increase with the dosage of polyurethane binder. The cohesion and internal friction angle of the polyurethane-stabilized ballast improve linearly with the increase of the polyurethane dosage. The deformation of the polyurethane-stabilized ballast also increases with the loading frequency while the deformation almost keeps stable after 40 Hz. The deformation of the polyurethane-stabilized ballast increases with the loading amplitude. The plastic collapse of the polyurethane-stabilized ballast with a lower polyurethane dosage occurs under a higher loading amplitude. Compared with the loading frequency, the loading amplitude has a more significant effect on the deformation of the polyurethane-stabilized ballast. The hoop effect exists in the polyurethane-stabilized ballast and the lateral expansion is constrained. The hoop effect is strengthened with the increase of the polyurethane dosage.
Discrete element modeling of polyurethane-stabilized ballast under monotonic and cyclic triaxial loading
https://orcid.org/0000-0003-1527-6619
Highlights The triaxial test was conducted for the polyurethane-stabilized ballast using DEM. Obtain the shear strength parameters of the polyurethane-stabilized ballast. Reveal the influence of frequencies and amplitudes of train loads.
Abstract A series of triaxial tests were conducted using the discrete element method to investigate the shear strength and deformation of the polyurethane-stabilized ballast with different dosages of polyurethane binder. The results show: The shear strength and Poisson’s ratio of the polyurethane-stabilized ballast increase with the dosage of polyurethane binder. The cohesion and internal friction angle of the polyurethane-stabilized ballast improve linearly with the increase of the polyurethane dosage. The deformation of the polyurethane-stabilized ballast also increases with the loading frequency while the deformation almost keeps stable after 40 Hz. The deformation of the polyurethane-stabilized ballast increases with the loading amplitude. The plastic collapse of the polyurethane-stabilized ballast with a lower polyurethane dosage occurs under a higher loading amplitude. Compared with the loading frequency, the loading amplitude has a more significant effect on the deformation of the polyurethane-stabilized ballast. The hoop effect exists in the polyurethane-stabilized ballast and the lateral expansion is constrained. The hoop effect is strengthened with the increase of the polyurethane dosage.
Discrete element modeling of polyurethane-stabilized ballast under monotonic and cyclic triaxial loading
Ling, Xing (author) / Xiao, Hong (author) / Liu, Guangpeng (author) / Zhang, Moyan (author)
2020-04-25
Article (Journal)
Electronic Resource
English
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