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针对双块式无砟轨道路基的典型结构,在参考遂渝铁路无砟轨道综合试验段现场测试数据的基础上,结合有限元数值计算结果,运用Winkler弹簧地基上叠合梁模型的计算理论,对车辆单轴荷载作用下无砟轨道路基面动应力分布进行讨论,提出反映无砟轨道路基面支承刚度的基床结构地基系数计算概念,初步建立无砟轨道路基面动应力沿线路纵向分布长度的解析计算方法。研究表明:车辆单轴荷载作用下路基面动应力分布表现为横向均匀、纵向三角形的基本形式;对路基面动应力沿线路纵向分布长度影响的主要因素是无砟轨道混凝土结构的刚度,车辆轴重的影响不显著;无砟轨道混凝土结构长期刚度的衰变将对路基面承受的动力作用产生不利影响。
Aiming at the typical structure of double block ballastless track subgrade, based on the field test data of the comprehensive test section of the ballastless track of Suiyu Railway, combining the calculation results of finite element method and the calculation theory of the composite beam model on the Winkler spring foundation, The dynamic stress distribution of the ballastless track under the uniaxial load of the vehicle is discussed. The concept of calculating the foundation coefficient of the subgrade structure reflecting the bearing stiffness of the ballastless track is proposed. The longitudinal distribution of the dynamic stress along the ballastless track Analytical calculation method. The results show that the dynamic stress distribution of the subgrade under the uniaxial load of the vehicle shows the basic form of transverse uniform and longitudinal triangle. The main factors affecting the longitudinal distribution of dynamic stress along the length of the road are the stiffness of the ballastless concrete structure, And the decay of long-term stiffness of ballasted concrete structures will have an adverse effect on the dynamic effects of the subgrade.