The winter operation experience of Harbin-Dalian High-speed Railway shows that the frost heaving of high-speed railway subgrade in cold region is common . As the static and dynamic track irregularity caused by the subgrade frost heaving affects the stable operation of the high speed trains , it is urgent to establish stan-dard for frost heaving control of subgrade of high speed railway .Based on FEM ,a dynamic model of vehicle-track-subgrade frost heaving was built to analyze the deformation law of CRTS Ⅲ type slab track and dynamic response of vehicle-track system under frost heave action combined . Results indicate that the subgrade frost heaving mainly affects the vertical dynamic performance of the train . With the increase of frost heave , the ve-hicle running stability decreased obviously . The effect of the frost heave is more severe when the wavelength is shorter . For the frost heave with 10 m wavelength and 15 mm amount of frost heaving , the dynamic tensile stress of the base plate exceeds its tensile strength . Combining with the results of dynamic analysis , different critical curves of the frost heaving controlling standard were drawn to give a division standard of subgrade une-ven frost heaving development .%哈大高速铁路的冬季运营经验表明,严寒地区高速铁路路基冻胀问题比较普遍.路基冻胀引起的轨道静、动态不平顺影响高速列车运行平稳性,有必要制定高速铁路路基冻胀控制标准.本文应用有限元方法建立车辆-轨道-路基冻胀分析模型,分析路基冻胀作用下CRTSⅢ型板式无砟轨道变形规律及车辆-轨道结构的动力响应特征.计算结果表明:冻胀主要影响列车垂向动力学性能;随着冻胀量的增加,车辆运营平稳性明显下降,其中波长较短冻胀的影响更剧烈;当冻胀达到10 m波长、15 m m冻胀量时,底座板动态拉应力超出其抗拉强度.基于动力学分析结果绘制冻胀控制标准临界曲线,对路基不均匀冻胀进行划分.
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