现代有轨电车嵌入式轨道路基联合优化分析

Joint optimization design analysis of embedded track and subgrade of modern tram

为建立更加经济合理的有轨电车嵌入式轨道路基共同受力模式,获得最佳参数组合,分别建立承轨槽有限元模型和弹性点支承轨道模型,通过数据拟合得到高分子填充材料与等效扣件刚度之间的关系,建立嵌入式轨道路基有限元模型,采用正交试验方法研究道床板厚度、高分子填充材料弹性模量、基床表层弹性模量、基床底层弹性模量、基床表层厚度、基床底层厚度这6种因素对嵌入式轨道路基一体化共同受力和变形分布规律的影响。研究结果表明:综合考虑嵌入式轨道路基设计的技术性指标和经济性指标、极差分析结果和路基基床动应力要求,确定最佳嵌入式轨道路基设计方案为道床板厚度0.18m,高分子材料弹性模量7 MPa,基床表层弹性模量140 MPa,基床底层弹性模量90 MPa,基床表层厚度0.3 m,基床底层厚度0.6 m。

The tram track and subgrade are usually separately calculated with their own independent force analysis system. In order to establish a more economic and reasonable joint force model and get the optimal combination of design parameters of the embedded track subgrade, finite element analysis software was used to establish the finite element model of rail ditch and the elastic point support track model. The relationship between the stiffness of polymer filled material and equivalent fastener stiffness was obtained by data fitting. Then the finite element model of embedded track subgrade was established. Six factors related to the stress and deformation effect distribution of embedded track subgrade were studied with orthogonal test method, which are track plate thickness, elastic modulus of polymer filled material, elastic modulus of subgrade bed surface and subgrade bed bottom, the thickness of subgrade bed surface and subgrade bed bottom. By comprehensively considering the technical and economical indexes, range analysis results and the dynamic stress of subgrade bed, the parameters for the optimal embedded track subgrade are： the thickness of track plate of 0.18 m, the elastic modulus of polymer filled material 7 MPa, the elastic modulus of bed surface 140 MPa, the elastic modulus of bed bottom 90 MPa, the bed surface thickness of 0.3 m, the bed bottom thickness of 0.6 m.