Dynamic Behaviors of Piled Embankment Under High-Speed Train Loads

Piled embankments over the soft soil can effectively reduce the post-construction settlement by soil arch effects. To investigate the soil arch effect under train moving loads, the authors established a full three-dimensional finite element model including train set, track structure and piled embankment. Based on the model, dynamic stress under moving train loads is calculated and the influence of soil arch effect is discussed. The numerical analysis reveals that: (1) soil arch effect leads to the redistribution of dynamic stress in piled embankment; (2) geogrids contribute to reducing the dynamic stress on the interpile soils; (3) track structures decide the dynamic stress distribution in the superficial layer in piled embankment, while the dynamic stress distribution at deep layer is mainly related to the pile foundation.