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Combined discrete-finite element modeling of ballasted railway track under cyclic loading. (English) Zbl 1404.74171
Summary: This paper proposes a combined discrete-finite element model to investigate the dynamic behavior of ballasted railway tracks. The discrete element method (DEM) is adopted to model the discrete ballast materials. The shapes of ballast particles resembles clumps of overlapping spheres which are obtained by the growth of spheres inside convex polyhedra. The finite element method (FEM) is used to analyze the continuous embankment and foundation. The transmission between DEM and FEM at the ballast-embankment interface is processed according to the interaction force based on the principle of virtual work. The dynamic behavior of ballasted railway track under cyclic loading is simulated with the developed DEM-FEM model. The settlement of the sleeper and the deformation of the embankment and foundation, the force chains in the ballast and stress distributions in the embankment and foundation are obtained. The developed model is helpful in better understanding the mechanical characteristics of ballasted railway tracks.
Reviewer: Reviewer (Berlin)

MSC:
74S05 Finite element methods applied to problems in solid mechanics
65N30 Finite element, Rayleigh-Ritz and Galerkin methods for boundary value problems involving PDEs
74M15 Contact in solid mechanics
Software:
DEMPack
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