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通过对既有线提速区段路基的调研和试验,得出结论,动应力与轴重、速度及线路平顺性有关。列车提速时,轴重增加和轨道不平顺对路基动应力影响最大。路基面动应力在横向呈马鞍分布,动应力沿深度方向衰减较快。采用当量折算和Boussinesq公式推算出的提速后路基动应力与实测值接近。在既有线提速改造中,重点应消除路基病害,提高基床特别是基床表层的强度和稳定性。
Through the investigation and experiment on the subgrade of the existing speed-raising section, it is concluded that the dynamic stress is related to the axle weight, speed and line ride comfort. When the train accelerates, the increase of axle load and track irregularity have the most influence on the dynamic stress of roadbed. The dynamic stress on the subgrade surface is saddle distributed in the horizontal direction, and the dynamic stress attenuates rapidly in the depth direction. The dynamic stress calculated by Equivalent Conversion and Boussinesq Formula is close to the measured value. In the existing line speed transformation, the focus should be to eliminate roadbed disease, improve the bed, especially the bed surface strength and stability.