无砟轨道结构层间损伤识别技术研究进展

Research progress on interlayer damage identification technology of slab track structures

无砟轨道在长期服役过程中受到列车荷载和复杂环境的耦合作用,会发生材料性能衰退、结构损伤累积,导致其服役性能逐渐劣化.综合论述中国板式和双块式无砟轨道常见层间损伤的表现形式和产生的原因;总结探地雷达法、冲击回波法及其他局部损伤识别方法在无砟轨道损伤识别中的应用情况,提出结合多种局部损伤识别技术是实现轨道局部损伤精准识别的关键;归纳基于模态参数、无砟道床振动信号及车辆振动信号的整体损伤识别技术,指出须扩充现场损伤检测样本以提高识别方法的泛化能力;详细分析各类识别方法的优势和局限性,为完善中国无砟轨道结构损伤识别技术体系和制定科学合理的维修策略提供指导.

Slab track suffers material performance decline and structural damage accumulation in the long-term service process under the coupling effect of train load and complex environment, resulting in a gradual deterioration of its service performance. The forms and causes of common interlayer damages on prefabricated slab track and double-block slab track in China were comprehensively discussed. The application of ground penetrating radar method, impact echo method and other local damage identification methods used in slab tracks were summarized.And it was proposed that combining multiple local damage identification techniques was the key to achieve accurate local damage identification of track structures. In addition, the overall damage identification technologies based on modal parameters, slab bed vibration signals and vehicle vibration signals were outlined. The need to expand the detection sample of field damages to improve the generalization of the overall identification method was pointed out.The advantages and limitations of various identification methods were analyzed in detail to provide guidance for improving the identification technology system of slab track structures in China and making scientific and reasonable maintenance strategies.