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随着高速铁路的兴建,对土质路基在循环荷载作用下的累积变形和破坏的研究越来越显得重要。基于三维有限元轨道/路基动力系统模型,计算得到列车动荷载作用下路基沿深度分布的动偏应力,然后结合LiD.Q.和Selig提出的路基土累积塑性应变模型来预测长期列车循环荷载作用下土质路基的累积变形。根据现场动载试验段的土性参数和试验条件下路基沿深度方向的动偏应力进行累积变形预测,预测结果与激振试验结果基本相符,从而验证了预测模型参数选择的有效性。然后对高速铁路无砟轨道路基进行累积变形预测,为建立无砟轨道路基累积变形的计算方法提供参考。
With the construction of high-speed railway, the study on the cumulative deformation and failure of soil subgrade under cyclic loading becomes more and more important. Based on the 3D finite element model of the track / subgrade dynamic system, the deviatoric stress of the subgrade along the train under dynamic loads is calculated. Then, the cumulative plastic strain model of subgrade soil proposed by LiD.Q. and Selig is used to predict the cyclic loading of long-term trains The cumulative deformation of soil subgrade. The cumulative deformation prediction is made according to the soil dynamic parameters of the on-the-spot dynamic test section and the deviatoric stress in the depth direction of the subgrade under the test conditions. The prediction results are in good agreement with the vibration test results, and the validity of the parameter selection of the prediction model is verified. Then, the cumulative deformation prediction of ballastless track subgrade in high-speed railway is provided to provide reference for the establishment of the calculation method of ballastless track cumulative deformation.