Abstract
To study the mechanical characteristics of ballasted bed under dynamic stability, a three-dimensional discrete element model of ballasted bed with 1000 mm × 700 mm × 550 mm is established based on the discrete element method. Meanwhile, a simulation test bench with the same size is built for simulation analysis and experimental research. The variation law and trend of settlement, lateral resistance, and compactness of ballasted bed under different excitation frequencies are analyzed comprehensively. The results show that when the excitation frequency is constant, the lateral resistance of sleeper, the settlement of sleeper, and the compactness of track bed under sleeper increase first and then tend to be stable. With the increase in horizontal excitation frequency, lateral resistance of ballast bed, sleeper settlement, and compactness first increase and then decrease after stable operation. The values of these parameters are maximized when the excitation frequency is 36 Hz which is the relative optimal horizontal excitation frequency of this model.
Highlights
With the development of railway transportation to high speed, heavy load, and large volume, the safety of railway is becoming more and more important
In the study of railway ballast, the stress-strain and deformation rules of ballast particles can be visually displayed by the discrete element method. e deformation and displacement of the whole ballast bed can be simulated in macroscopic aspect, and the movement rule and contact force of ballast particles can be simulated in mesoscopic aspect. rough the simulation analysis of the discrete element method, the change rules of force and deformation of the ballast bed discrete body under dynamic stabilization operation are analyzed and explained theoretically
E settlement of the sleeper is applied to the sleeper to simulate the effect of downward pressure, and the dynamic stabilization operation of the ballast system is simulated and analyzed. e microcharacteristic parameters such as displacement, angular displacement, and contact force of ballast particles and the macro-characteristic parameters such as displacement, compactness, and transverse resistance of the whole ballast are obtained under dynamic stabilization operation
Summary
With the development of railway transportation to high speed, heavy load, and large volume, the safety of railway is becoming more and more important. Gao et al [6] established a three-dimensional model of ballasted bed-sleeper for highspeed railway using the discrete element method and studied the influence of cross section size of ballasted bed on lateral resistance and the changing rule of lateral resistance. In this paper, based on the discrete element method, a reduced three-dimensional discrete element simulation model of ballasted bed is established, and a ballast box test bench with the same proportion as the simulation model was built to carry out simulation analysis and experimental research under dynamic stabilization operation. Change rules and trends of settlement, lateral resistance, and compactness of ballast bed under loads with different excitation frequencies during dynamic stabilization operation are analyzed comprehensively on the basis of the discrete element simulation model
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