下負荷面モデルを用いた繰返し載荷を受けた道床バラストの弾塑性変形挙動の検討

<p> Ballasted track has the structure to lay the ballast under the sleeper. The ballast shows the plastic deformation behavior by cyclic train load gradually and we keep soundness of ballast to repair when its plastic deformation gets greater. It seems difficult to predict the deformation behavior of ballast subjected to cyclic train loading because its shape is granular, and then we can not predict the temporal change of deformation and select the weak point, needed to be repaired which has the vertical track regularity inspected by the track inspection.</p><p> In this study, we aim to resolve and reproduce the deformation behavior of ballast subjected to cyclic loading, and considered to use the finite numerical analysis with subloading surface model as unconventional plasticity. We simulated the element test of ballast and the full scale model test of ballasted track on straight roads and considered the validity of the numerical analysis method.</p>