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研究目的:本研究主要为了确定遂渝线无碴轨道综合试验段路基(刚性路基、土路基)上铺设板式无碴轨道的轨道结构参数。研究方法:利用有限元模型,路基按刚性路基、土路基、设与不设混凝土层、轨道板与底座伸缩缝是否对齐等多种工况进行轨道结构各层及基床表层的受力特性分析。研究结果:对于板式轨道没有必要在底座下设置混凝土层。土路基上轨道板与底座伸缩缝错开设置对轨道结构受力较为有利。研究结论:在刚性路基和土路基上,板式轨道可不设置支承层。土路基上设计板式轨道时应尽量减少底座伸缩缝的设置,同时应使轨道板与底座伸缩缝错开布置。刚性路基上设计板式轨道时可根据工程需要来确定轨道板与底座伸缩缝是否对齐。土路基上,在相同条件下,基床表层厚度由400 mm增加到700 mm,各层应力变化很小。
Research purposes: The purpose of this study is to determine the orbital parameters of slab ballastless track laying on the embankment (rigid subgrade and soil subgrade) of the comprehensive test section of ballastless track on Suining-Chongqing railway line. Research methods: The finite element model is used to analyze the stress behavior of the subsoil of the track structure and the subsoil under various conditions, such as rigid subgrade, soil subgrade, whether there is no concrete layer, alignment of track plate and base expansion joint, . Findings: It is not necessary for the slab track to have a concrete layer under the foundation. Soil subgrade on the track plate and the base expansion joints staggered set on the rail structure is more favorable force. Research conclusions: On rigid subgrade and soil subgrade, no support layer is required for slab track. Dirt track design should be minimized when the base plate expansion joints set, and should make the track plate and the base expansion joints staggered layout. Rigid subgrade design plate rail can be based on engineering needs to determine the track plate and base expansion joints are aligned. Soil subgrade, under the same conditions, the bed surface thickness increased from 400 mm to 700 mm, the stress changes in all layers is small.