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Communication Dans Un Congrès Année : 2013

Distinct element simulations of the sleeper-ballast response under the action of traffic

Résumé

A microscopic analysis of the ballast-sleeper interaction system is performed using Distinct Element simulations, both under monotonic and cyclic loadings, in order to analyze the mechanical response of the system. The 2D ballast-sleeper model is constructed from the generation of irregular polygons by Voronoï tessellation, leading to a grading of particles close to real ballast. A preliminary study with different boundary conditions and material characteristics is conducted under monotonic loading for validation of the model; then cyclic loadings are developed. The ballast response is characterized in terms of particles displacements, contact forces, and sleeper settlements. Under monotonous loading, the results show that different loading force amplitudes produce different contact force chains, with contact force magnitudes not strictly proportional to the external loading force, due to the elasto-plastic model used for the contacts and to particles rearrangement. The boundary conditions applied to the lateral walls of the system (fixed or stress controlled walls) have an influence on the system response and shows the advantage of ballast confinement. The influence of different geometrical and mechanical parameters under cyclic loading is analyzed both at the microscopic and macroscopic scales. The size and the angularity of particles influence both the sleeper settlements and the contact force network. Different mechanical characteristics of contacts (friction angle, elastic stiffness) produce different displacements and contact force patterns. More generally, the simulations show that the microscopic parameters of the particles have a large influence on the macroscopic response of the system.

Domaines

Génie civil
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Dates et versions

hal-00990231 , version 1 (13-05-2014)

Identifiants

  • HAL Id : hal-00990231 , version 1

Citer

Juan Martinez, Guoqing Jing, Samuel Masson. Distinct element simulations of the sleeper-ballast response under the action of traffic. Ballast : Issues & Challenges, Dec 2013, Paris, France. ⟨hal-00990231⟩
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