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研究目的:本文以遂渝线12号无碴道岔道床为例,对12号无碴道岔的轨下基础受力和变形特性进行了分析,为无碴道岔道床的设计提供参考。研究方法:根据多重叠和梁理论,运用有限元方法建立了无碴轨道道岔区轨下基础受力模型,针对无碴轨道板之间接触条件的特点,对无碴轨道道岔区轨下基础受力进行了分析。研究结果:在同样荷载条件下,板层之间无紧密连接的无碴轨道的板层拉应力要大于板层有紧密连接结构的拉应力;当道床板层之间紧密连接时,道床板连续与否对道床板弯矩和路基面压应力影响不大。研究结论:通过建立无碴轨道岔区道床有限元模型对岔区道床在列车荷载作用下的轨道响应进行了探讨,并分析计算了岔区分开式道床和连续式道床的道床板截面最大弯矩供设计时参考。道床板层之间紧密连接时,道床板连续与否对道床板弯矩和路基面压应力影响不大,故道床设计时可针对分开式道床和连续式道床的特点进行合理选用。
The purpose of this study is to analyze the stress and deformation characteristics of 12 # ballastless turnout under ballastless turnout in Suiyu Line, which will provide a reference for the design of ballastless ballast bed. Research methods: According to the theory of multiple overlap and beam, the foundation stress model of ballastless track railroad turnout area is established by finite element method. According to the characteristics of contact conditions between ballastless track slabs, Force was analyzed. The results show that under the same load conditions, the tensile stress of the slab track of the ballastless track with no close connection between slabs is greater than the tensile stress of the slab with close connection structure. When the ballast beds are closely connected with each other, No effect on ballast bed moment and embankment surface compressive stress. Research conclusions: The track response of ballast bed under the train load is discussed through the establishment of ballastless ballast bed ballast bed finite element model, and the maximum bending moments of the ballast bed section and the continuous ballast bed are analyzed and calculated. For design reference. When the ballast beds are closely connected with each other, the continuous or not of the ballast beds has little effect on the bending moment of the ballast bed and the compressive stress on the roadbed. Therefore, the design of the ballast bed can be reasonably selected according to the characteristics of the split balustrades and the continuous ballast.