The critical zones are the discontinuities along a railway line that highly susceptible to differential settlement, due an abrupt variation in support conditions over short span. Consequently, these require frequent maintenance ensure adequate levels of passenger safety and comfort. A proper understanding behavior tracks at is imperative enhance their performance reduce frequency costly operati...

One of the most important challenges in the development of urban railways network is the effects of railway vibrations on human and adjacent structures. Although various investigations into the sources of railway vibrations have been conducted, very few research works have been reported on the influences of track geometry parameters on the level of vibrations. This is addressed in this resea...

In this paper, the three-layer model of ballasted railway track with discrete supports is analyzed to access its applicability. The referred as support and abbreviated by DSM. For calibration, a 3D finite element (FE) created validated experiments. Formulas available in literature are new formulas for identifying parameters DSM derived over range typical properties. These determined fitting res...

• Modelling of a ballastless track over an embankment-tunnel transition zone. Development hybrid methodology to simulate the degradation process track. Only 30% subgrade is contributing permanent deformation. Ballastless shows satisfactory long-term performance after 1 million loading cycles. Inclusion resilient mat under concrete slab reduces higher stresses at Railway zones are characterised ...

The design of high-speed railway lines involves geotechnical challenges, one which is the risk dynamic track amplification, for example on sections where train speed approaches track-ground critical speed. In these cases, soil strains increase significantly with an in speed, far exceeding limits linear elastic behaviour. This can result a non-linear reduction stiffness. To better understand thi...

Ballast flying problems obsess the ballasted high speed railway, its microscopic mechanics is less of discovered. In the paper, the railway ballast particle force equilibrium is analyzed through basic mechanics and mathematic formula, and a model is set up to discover the factors and influence. The microscopic ballast flying model is used for ballast bed geometry and ballast shape optimization,...