城际铁路弹性支承块式无砟轨道结构优化及检算

为合理控制城际铁路轨道工程投资,针对城际列车轴重轻、编组小的特点,对弹性支承块式无砟轨道进行结构优化设计与检算分析。基于数值分析理论及有限元分析方法,研究隧道内弹性支承块式无砟轨道在设计轮载及现浇混凝土收缩荷载组合下裂缝开展情况,并进行道床板配筋设计及裂缝宽度检算;基于定额测算对比城际铁路与客货共线铁路弹性支承块式无砟轨道的经济性。结果表明:城际铁路弹性支承块式无砟轨道道床板纵向只需配构造钢筋,按照配筋设计检算得出的道床板横向最大裂缝宽度为0.205 mm,小于裂缝容许值;相比于客货共线铁路,城际铁路弹性支承块可降低投资约10%。

Structural Optimization and Calculation of Low Vibration Track on Intercity Railway

Structural optimization and calculation of low vibration track(LVT) are carried out in view of the characteristics of light axle load and short formation of intercity train so as to control the investment of intercity railway track engineering at a reasonable level. The crack development of low vibration track in tunnel under the combination of designed wheel load and shrinkage load of cast-in-situ concrete is studied based on numerical analysis theory and FE method, and the reinforcement design of deck slab and calculation of crack width are conducted according to the crack development situation. The economy of low vibration track of intercity railway and mixed passenger and freight railway is compared based on quota calculation. The results show that the longitudinal reinforcement of deck slab of low vibration track on intercity railway is only needed with constructional reinforcement. The maximum crack width in the transverse direction of deck slab is 0.205 mm according to the calculation base on the design of reinforcement, which is within the allowable value of crack. Compared with the mixed passenger and freight railway, the low vibration track of inter-city railway can reduce the investment by about 10%.