Response Analysis of a Ballasted Rail Track Constructed on Soft Soil by 3D Modeling

The displacement, stress, and strain distributions of railway embankments on the soft deltaic deposit Ganges–Brahmaputra floodplain are investigated. A numerical model developed in general-purpose finite element software is used to simulate design train load a for 100 km/hr rail speed. analysis analogy grounded spring model, where beam under unit modeled based Winkler foundation concept. In moving simulation soil, static point relating axle assigned form dynamic multiplier, determined using auxiliary software. calculated shear force terms influence line applied as multiplier. results demonstrate that load, loose ballast undergoes larger more erratic displacement than subballast. Comparative between varying subballast stiffnesses shows stiffer yields smaller displacements. Moreover, high stiffness can counterbalance potential forming permanent deformation by generating lower strains. However, does not play prominent role reducing or vertical stresses. subgrade found carry maximum withstanding stress; thus, importance an improved with higher also observed. greater improves its load-carrying capacity but fails reduce tension responsible lateral spreading subsoil. To radial strain, effects improving properties two immediately adjacent soil layers numerically improvement subsoil alone effective whereas both produces further reductions. critical speed identified 120 km/hr, velocity amplitude decreases depth. Finally, allowable limit embankment settlement