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对国内外高速铁路无砟轨道路基沉降的限值问题进行了分析研究。在此基础上,通过建立有限元模型,对路基沉降下的轨道板弯矩进行了计算,并与简化算法结果进行了对比分析。研究表明:对于我国设计速度300km/h的客运专线,路基不均匀沉降按15mm/20m控制,均匀沉降按30mm控制较为合适;特殊情况下,对于超过扣件调高量的路基沉降应借鉴国外的方式补充相关规定;在计算不均匀沉降产生的轨道板弯矩时,建议沉降曲面借鉴日本的假设,按15mm/20m半波长正弦曲面考虑;简化算法得到的轨道板弯矩值有可能比有限元直接建模得到的结果小,在工程设计中是否直接采用此法值得探讨。
The domestic and international high-speed railway ballastless track subgrade settlement limits were analyzed. Based on this, the bending moments of the track slab under subgrade settlement are calculated through the establishment of the finite element model, and compared with the simplified algorithm results. The research shows that for the passenger dedicated line with designed speed of 300 km / h in our country, the uneven subgrade settlement is controlled by 15 mm / 20 m and the uniform subsidence is more suitable for 30 mm control. In special circumstances, for subsidence settlement of subgrade exceeding the fastener, When calculating the moment of orbital plate caused by uneven settlement, it is suggested that the settlement surface should be based on the hypothesis of Japan and be considered as 15mm / 20m half-wave sine surface. The bending moment of the plate obtained by the simplified method may be higher than the finite element The direct result of modeling is small, and it is worth to discuss whether this method should be adopted directly in engineering design.