Abstract:
In railway lines, transition zones between different track support conditions normally evidence higher degradation rates,
thus requiring additional maintenance to ensure safety and service quality. Studies based on numerical simulations indicate
that under sleeper pads (USP) can minimise those degradation rates. The study presented herein focuses on the influence of
USP on the dynamic behaviour of transitions to underpasses, in an attempt to fill the gap between numerical and field
studies. To that aim, the authors used finite element method models, calibrated and validated with field measurements. These
models take into account the train–track interaction and include all relevant track components and backfill geomaterials.
This study shows that soft USP have a significant influence over the track’s dynamic behaviour: amplifying rail
displacements and sleeper accelerations, and inducing abrupt variations in the track vertical stiffness and oscillations in
train–track forces. To benefit from the use of USP, the authors highlight the need to carefully design stiffness properties of
USP and determine their arrangement at transitions. An improved design for the transition zone is proposed.
