Intensive urban growth leads the need of rail road tracks to be constructed on marginal soils as well as soils with very low strength. Application of geosynthetic has been shown to be effective in reducing excessive settlement and lateral displacement of tracks over soft subgrade under cyclic loading. Tests were performed on full paneled 1:3 scale model railway tracks to evaluate deformation and post-cyclic strength of geosynthetic reinforced railway track on a soft subgrade. The deformation pattern of the model track in rail and sleeper direction was also traced from the laboratory model tests. From the model tests, it is also confirmed that, after cyclic loading the modulus of the track has been increased, nevertheless, the increment of subballast thickness also increases the stiffness of the track. A generalized bilinear log–log model is proposed for the prediction of tie deflection with number of load cycles for fine-grained soils. An attempt has been made to incorporate the existing methods applicable for predicting cumulative plastic deformation for fine grained soils to the prediction of tie deflection. The cyclic response of the laboratory models were also well supported by the predictions of the three-dimensional finite element analysis. Comparisons between predicted and experimental results show good applicability of the improved method. The results exhibit that the geosynthetics reinforcement can be effectively used to improve the performance of railway tracks on clayey subgrade.

密集的城市发展导致需要在边际土壤以及强度非常低的土壤上修建铁路轨道。土工合成材料的应用已被证明可有效减少循环荷载作用下软基上轨道的过度沉降和横向位移。在全面板的1：3比例模型铁路轨道上进行了测试，以评估软土路基上土工合成材料增强型铁路轨道的变形和后循环强度。还从实验室模型测试中跟踪了模型轨道在钢轨和轨枕方向上的变形模式。从模型测试中，还可以确认，在循环载荷之后，轨道的模量已经增加，但是，子ball石厚度的增加也增加了轨道的刚度。提出了一种广义双线性对数-对数模型，用于预测细粒土的荷载变化循环次数与拉杆挠度的关系。已经尝试将适用于预测细粒土的累积塑性变形的现有方法结合到连接挠度的预测中。三维有限元分析的预测也很好地支持了实验室模型的循环响应。预测结果与实验结果之间的比较表明，该改进方法具有良好的适用性。结果表明，土工合成材料增强材料可以有效地改善黏土路基上的铁路轨道性能。已经尝试将适用于预测细粒土的累积塑性变形的现有方法结合到连接挠度的预测中。三维有限元分析的预测也很好地支持了实验室模型的循环响应。预测结果与实验结果之间的比较表明，该改进方法具有良好的适用性。结果表明，土工合成材料增强材料可以有效地改善黏土路基上的铁路轨道性能。已经尝试将适用于预测细粒土的累积塑性变形的现有方法结合到连接挠度的预测中。三维有限元分析的预测也很好地支持了实验室模型的循环响应。预测结果与实验结果之间的比较表明，该改进方法具有良好的适用性。结果表明，土工合成材料增强材料可以有效地改善黏土路基上的铁路轨道性能。预测结果与实验结果之间的比较表明，该改进方法具有良好的适用性。结果表明，土工合成材料增强材料可以有效地改善黏土路基上的铁路轨道性能。预测结果与实验结果之间的比较表明，该改进方法具有良好的适用性。结果表明，土工合成材料增强材料可以有效地改善黏土路基上的铁路轨道性能。