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路基动应力特性在高铁路基设计中非常重要,因此对其进行研究具有一定的意义。通过列车-轨道-路基三维有限元数值方法,计算得到了在京津城际轨道不平顺谱下路基面横向各位置处的动应力。利用概率统计理论,统计得到了3种列车速度下路基面横向各位置处动应力的均值和变异系数;并通过对路基面中心位置处动应力计算结果进行统计分析得到了京津城际轨道不平顺谱下路基动应力的最优概率分布模型。结果表明,在京津城际轨道不平顺谱下,路基面动应力均值沿横向呈现“M”型分布,变异系数沿横向逐渐减小。列车速度对路基动应力均值及变异系数具有一定的放大效应,且路基动应力沿纵向近似服从对数正态分布。
The dynamic stress characteristics of subgrade are very important in the design of high-speed railway embankment. Therefore, it is of certain significance to study the dynamic stress characteristics of subgrade. The dynamic stress at each position in the horizontal direction of embankment under the railway-Beijing-Tianjin inter-city track irregularity spectrum is calculated by the three-dimensional train-track-embankment 3D finite element numerical method. Using the theory of probability and statistics, the mean and coefficient of variation of dynamic stress at each position of the horizontal direction of the embankment under three kinds of train speeds are obtained. Through the statistical analysis of the calculation results of dynamic stress at the center of the roadbed, The Optimal Probability Distribution Model of Dynamic Stress in Subgrade under the Smooth. The results show that under the Beijing-Tianjin inter-city orbit irregularity spectrum, the mean value of dynamic stress on the subgrade exhibits “M ” type distribution along the horizontal direction, and the coefficient of variation decreases gradually along the horizontal direction. The train speed has a certain amplification effect on the mean and variation coefficient of dynamic stress of subgrade and the subgrade dynamic stress follows the logarithm normal distribution along the longitudinal direction.