中文摘要：

以郑西高速铁路客运专线路堑段铁路黄土边坡工程实例为背景，经过适当简化处理，利用数值模拟软件FLAC建立了轨道-路基-黄土边坡系统动力分析计算模型，并对不同列车运行速度下黄土边坡的扰动程度及边坡稳定性进行了分析。结果表明，黄土边坡的扰动程度随列车运行速度的增大而增大，稳定性随列车速度的增大而减小。

英文摘要：

This paper takes the project example about loess cut side slope along Zhengzhou - Xi＇ an high-speed Passenger transportation special line as a background, establishes a dynamic analysis computation model of orbital-roadbed-loess side slope by using numerical simulation software FLAC. And disturbed degree and stability of the loess side slope was analyzed for different train-speed. The result indicates that the train speed is faster , the loess side slope perturbation degree is more intense and the stability coefficient of the loess side slope is smaller.