Study On The Interaction Of Piled Slab Embankment And Subgrade Soil Of Ballastless Track In High-Speed Railway

Piled slab embankment is a kind of new-type form of ballastless track in high-speed railway. It synthesizes respective characteristic with the ballastless track and the piles, fully depends on pile-soil and slab-soil interaction to satisfy with the intensity,stability and settlement after acceptance of ballastless track, provides the high smoothness. This paper unified National Natural Science Foundation of China project'study on the interaction of piled-slab-subgrade soil of piled slab embankment in high-speed railway', carry out deep research on piles slab embankment.Based on the former research, the author establishes a three-dimensional train-ballastless track-piled slab embankment model with finite element software. Trying to simulate the mechanics response of piled slab embankment of ballastless track in high-speed railway, the author combined with related dynamic data and verify the reliability of this modelingThrough exerts the static load and dynamic train load, as well as the transformation influencing factors of pile diameter,span,train speed and slab contact situation, carries on the analysis to the subgrade statics and dynamic response's influence. Analysis shows that the concrete stress,deflection,lateral displacement,longitudinal displacement meet the present standard requirement under static loads. The load undertakes by the contacting board earth and piles; under the dynamic load, various operating modes can satisfy the security,stability,passengers comfort and other present standard request, piled slab embankment take most of vertical load, subgrade dynamic stress is small; the result which obtains according to the standard computation has the high safety coefficient; the span,train speed increase,pile diameter reduction and slab-earth separationsituation enables the piled slab embankment dynamic response increases, but can satisfy the operation request.