遂渝线路基上板式无碴轨道结构设计研究

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 on Structure Design of Slab Ballastless Track on Subgrade of Suining - Chongqing Railway

Research purposes: The mainly purposes of the research are to determine the structure parameters of slab ballastless track on subgrade(rigid subgrade,soil subgrade) in integral trial section for ballastless track on Suining-Chongqing railway.Research methods: By using Finite Element Model,the paper analyzes mechanics performance of each layer of slab ballastless track and top-layer of subgrade bed under various working conditions,such as slab ballastless track on rigid subgrade,soil subgrade,inserting HGT layer or not below supporting structure,aligning the expansion joints between track slabs and supporting structure or not,and so on.Research results: It is not necessary to insert the HGT layer below supporting structure.And if the expansion joints between track slabs and supporting structure do not be aligned,it is advantageous to track structure bearing force.Research conclusions: On the rigid subgrade and soil subgrade,it is not necessary to install the HGT layer below supporting structure.When designing the slab ballastless track on soil subgrade,the number of expansion joints of supporting structure should be cut down as fully as possible,and the expansion joints between track slabs and supporting structure do not be aligned.When designing the slab ballastless track on rigid subgrade,determining whether the expansion joins be even or not.Under the same conditions,there are very low change of stress of each layer of the slab ballastless track when the thickness of top-layer of subgrade bed is increased from 400 mm to 700 mm on soil subgrade.