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通过建立路基段CRTSⅡ型板式无砟轨道支承层斜裂模型，进行有限元仿真计算，分析了支承层斜裂角度、裂开程度对轨道板上拱的影响规律，并提出整治措施。结果表明：随着斜裂角度和裂开程度的增加，轨道板的上拱位移和层间离缝均显著增大。完全裂开的情况下，斜裂角度为45°时，轨道板上拱位移和离缝宽度分别达到2.47、1.78 mm；斜裂角度为60°时，轨道板上拱位移达4.54 mm。斜裂角度较大时，容易形成三角坑，危害行车安全。随着裂开程度增大，损伤区域和损伤程度也相应增加，损伤因子最大值均达到0.99。在高温和列车荷载作用下，斜裂会沿着交界处的薄弱环节向未开裂区域扩展，影响轨道结构耐久性和行车安全性。建议采用分阶段整治策略，第一阶段采取支承层横向切缝的过渡性方案；第二阶段采用绳锯切割、置换病害支承层的方案进行彻底整治。
Abstract：By establishing a model of oblique cracking in the support layer of CRTS Ⅱ slab ballastless track in the roadbed section and conducting finite element simulation calculations, the influence of the angle and degree of oblique cracking in supporting layer on the upwarp of the track slab was analyzed, and remediation measures were proposed. The results indicate that as the angle and degree of oblique cracking increase, the upwarp deformation and interlayer gap of the track slab significantly increase. In the case of complete cracking, when the angle of oblique cracking is 45°, the upwarp displacement and gap width on the track slab reach 2.47 mm and 1.78 mm respectively. When the angle of oblique cracking is 60°, the upwarp displacement on the track slab reaches 4.54 mm. When the angle of oblique cracking is large, it is easy to form a triangular pit, which endangers driving safety. As the degree of cracking increases, the damage area and degree also increase accordingly, and the maximum value of the damage factor reaches 0.99. Under high temperature and train load, oblique cracking will propagate along the weak links at the junction to the uncracked areas, affecting the durability and safety of the track structure. It is recommended to adopt a phased remediation strategy, with the first stage adopting a transitional plan of transverse slitting of the support layer, and the second stage adopts a scheme of using a rope saw to cut and replacing the damaged support layer for thorough remediation.
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基本信息:
中图分类号:U238;U213.244
引用信息:
[1]李秋义,王昌昌,谷永磊,等.路基段支承层斜裂对CRTSⅡ型轨道板上拱的影响[J].铁道建筑,2026,66(07):1-6.
基金信息:
京沪高速铁路股份有限公司科技研究项目（京沪科研-2022-20,京沪科研-2022-22）
2026-06-30
2026-06-30
2026-06-30