中文摘要：

针对青藏铁路多年冻土区路基沉降病害条件下的无缝线路长钢轨变形规律展开研究，在钢轨发生竖向位移条件下，建立三维长钢轨非线性有限元计算模型，分析路基沉降病害条件下长钢轨节点位移分布及发展规律。研究结果表明：钢轨竖向位移与路基下沉量在道床阻力发挥效用范围内呈近似线性关系，当路基上拱与下沉交替时，钢轨位移显著增加。

英文摘要：

The paper study about under the condition of vertical settlement of track deformation analysis.Analysisof track displacement distribution and the law of development under the condition of embankment settlementdiseases based on nonlinear finite element method.Research indicates that rail vertical displacement and roadbedsubsidence has the linear relationship in the range of track bed resistance to be effective.When the roadbed archand sink alternately that will be a significant increase in rail displacement.