Abstract
The sub-grade of the railway track subjected to dynamic loading is governed by its dynamic material parameters, the basic dynamic material parameters are unit weight, Young’s modulus, Poisson’s ratio and the material damping. However, there is a need to identify the parameters of the sub-grade that has significant effect on the dynamic response of the railway track to achieve the specified technical requirements because the behavior of the sub-grade cannot be easily estimated or verified. Hence, this paper uses three-dimensional finite elements ABAQUS coupled with Artificial Non-Reflecting Boundary to investigate the effect of varying the unit weight, Young’s modulus, Poisson's ratio and the damping ratio of the sub-grade in the surface vibration induced at the embankment railway track in terms of Peak Vertical Velocity due to moving of the train loads. The input soil parameters used are soft clay, stiff clay, loose and dense uniform sand to demonstrate the parametric study. The predicated results show that both the Young’s modulus and damping ratio of the sub-grade have quite significant effect on the induced surface vibrations of railway track; while the influence of both unit weight and Poisson’s ratio are very small. Hence to fulfill the technical requirement of the railway track, special attention regarding to the Young’s modulus and the damping ratio of the sub-grade should be paid.
Highlights
Railway is regarded as one of the most crucial means of transportation and is widely used in several applications
The effect of variable subsoil conditions has been studied [2], railway embankments on layered ground is studied [3], the dynamic behavior of the rail track has been examined [4], numerical modeling of ground borne vibrations from high speed rail lines on embankments is presented [5], three-dimensional dynamic analyses of track-embankment-ground system subjected to high speed train loads is developed [6] and prediction model for low frequency vibration from high speed railways on soft ground is observed [7]
Ground vibrations induced from railway track and other random dynamic overload accounts for inertial effects, damping and time dependent load all require nonlinear dynamic analysis because the model may exhibit large displacement, especially to the presence of soft soils
Summary
Railway is regarded as one of the most crucial means of transportation and is widely used in several applications. If the sub-grade does not have sufficient stability, it will be impossible to maintain proper track alignment, profile (surface) and cross level. The proposed models have been examined that the railway track is more vulnerable to larger deformations concentrated in the soft soil and shows a greater stability in case of stiff soils, ISSN PRINT 1392-8716, ISSN ONLINE 2538-8460, KAUNAS, LITHUANIA. MODELLING THE INFLUENCE OF SUB-GRADE MATERIAL PARAMETERS ON THE RESPONSE OF RAILWAY LINE UNDER MOVING TRAIN LOADS. This paper mainly focused on the comparison of results obtained through numerical models of railway vibrations under different choice of sub-grade parameters. The analysis is performed using the commercial finite element package, ABAQUS after imported 3D solid elements from CATIA software
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