土路基上无砟轨道的合理型式及其受力性能

Reasonable Style and Mechanical Property of Ballastless Track on Soil Subgrade

研究目的：针对土路基上无砟轨道的特点,采用有限元分析理论,建立土路基上板式无砟轨道结构的有限元分析模型,对土路基上板式轨道结构的合理型式进行研究,并分析底座尺寸改变对土路基上轨道结构力学性能的影响,以期研究结论可为土路基上无砟轨道结构的铺设及相关设计研究提供参考。研究结论：（1）相比实体板,框架板可有效减小轨道板在荷载作用下的应力和位移,其中最大拉应力减小约16%,最大位移减小约11%,同时自重减轻约30%,在土路基上铺设框架型轨道结构具有较高的技术经济性;（2）框架板式轨道结构的受力受底座厚度的影响更明显,受底座宽度的影响甚微;（3）底座尺寸的改变不影响框架型轨道板的应力分布规律;（4）土路基上框架型板式无砟轨道结构建议底座宽度取值为300－320 cm,厚度则取为30 cm左右,且不必为减小结构的受力而刻意的增大底座尺寸;（5）该研究成果可为无砟轨道的设计、维修更换提供理论依据。

Research purposes： Considering the characteristics of the ballastless track on soil subgrade, the finite element analytical model of slab ballastless track on soil subgrade was established to study the reasonable track structue and to analyze the effects of base dimensions on the mechanical property of slab track structure on soil subgrade, for purpose of providing references in the application and design of ballastless track structue on soil subgrade. Research conclusions： （ 1 ） Compared with the solid slab, frame slab can effectively reduce the stress and displacement of the track slab under the action of load, the maximum stress and displacement of frame slab decreased about 16% and 11% respectively, meanwhile, the dead load of the frame slab decreased about 30% , and laying the frame slab on soil subgrade has a high level of techno - economic advantages. （2） The mechanical property of frame slab ballastless track is influenced more by the thickness of base stress distribution rules of the frame slab. than （4） by the width. （3） The change of the base dimension woni affect the The reasonable recommended values of the width of roadbed on soil subgrade is about 300 - 320 cm and the thickness is about 30 cm. It－ not necessary to increase the size of base for the purpose of reducing the stresses of the structure. （ 5 ） The research results can provide theoretical basis for the design and maintenance of ballastless track.