Forward Numerical Simulation of Dynamic Response Characteristics of High-Speed Railway Subgrade
In order to predict and analyze the dynamic loads,vibrations,and impacts generated by high-speed trains traveling on the roadbed,evaluate the stability and strength of the roadbed,a forward numerical simulation method for the dynamic response characteristics of high-speed railway roadbed is proposed.The solid units are used to simulate sleepers and rails.A three-dimensional consistent viscoelastic artificial boundary condition and three-dimensional consistent viscoelastic boundary element are set up for the roadbed,roadbed body,and track bed,and a numerical model of high-speed railway roadbed is constructed.In terms of displacement,acceleration,and stress,combined with the load distribution function of the wheels,a high-speed railway roadbed dynamic response function is constructed.The dynamic response characteristics of the high-speed railway roadbed are analyzed,and the displacement,acceleration,and stress values generated at different depths,surface thickness of the roadbed machine tool,and driving speed are calculated.The simulation results show that there is no obvious pattern of changes in stress,displacement,and acceleration,while the attenuation trend of stress and acceleration is relatively large.This attenuation trend gradually weakens with the increase of depth,and the influence of the thickness of the foundation layer on displacement is higher than that of stress and acceleration.
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