Mechanical properties of foamed polyurethane solidified ballasted track

High-speed Railway Pub Date : 2023-06-01 DOI:10.1016/j.hspr.2023.04.001

Yang Xu, Luchao Qie, Hong Wang, Wenying Yu

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Abstract

Foamed Polyurethane Solidified Ballasted Track (FPSBT), an innovative railway track, is formed by solidifying ballast bed with foamed polyurethane. Compared with the traditional Discrete Ballasted Track (DBT), FPSBT does not require regular maintenance such as tamping and cleaning. However, limited studies exist on the mechanical properties of FPSBT. In this study, Laboratory experiments are conducted on polyurethane samples to investigate the effects of polyurethane density on the mechanical properties of FPSBT. Furthermore, the performance of DBT and FPSBT with different polyurethane densities are compared, and the recommended polyurethane density is obtained. FPSBT exhibited negligible accumulation of deformation under cyclic loads, indicating excellent performance of FPSBT owing to the anti-deformation properties of polyurethane. Further, a track load vehicle test is conducted. FPSBT exhibited better load-transmitting ability than DBT. Finally, the construction and application of FPSBT in China are introduced. This study is expected to contribute to realizing a more extensive application of FPSBT.

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泡沫聚氨酯固化有碴轨道的力学性能

发泡聚氨酯固化有砟轨道是一种新型的轨道，它是由发泡聚氨酯固化道床而成。与传统的离散式有砟轨道（DBT）相比，FPSBT不需要定期维护，如夯实和清洁。然而，对FPSBT的力学性能的研究有限。在本研究中，对聚氨酯样品进行了实验室实验，以研究聚氨酯密度对FPSBT力学性能的影响。此外，对不同聚氨酯密度的DBT和FPSBT的性能进行了比较，得出了推荐的聚氨酯密度。FPSBT在循环载荷下表现出可忽略的变形累积，表明由于聚氨酯的抗变形性能，FPSBT具有优异的性能。此外，还进行了轨道载荷车辆试验。FPSBT表现出比DBT更好的负载传递能力。最后介绍了FPSBT在我国的建设和应用情况。这项研究有望有助于实现FPSBT更广泛的应用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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High-speed Railway

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