现代有轨电车轨道路基联合优化分析

为得到有轨电车典型轨道路基最优设计参数组合,采用大型有限元分析软件ANSYS建立轨道路基空间耦合模型,运用正交试验方法研究扣件刚度、轨道板厚度、支承层厚度、基床总厚度、基床压实指标K_(30)这5种因素对轨道路基的受力和变形分布规律的影响。根据极差分析方法,确定影响轨道路基设计方案技术性指标和经济性指标的因素重要性次序,同时以基床总厚度为指标对比分析轨道路基联合设计方法与传统路基设计方法之间的区别。结果表明:采用轨道路基联合设计方法得到的轨道路基方案较传统单独设计方法获得的方案更加经济合理;综合考虑轨道路基设计的技术性指标和经济性指标,确定最佳轨道路基设计方案为扣件刚度40 k N/mm、轨道板厚度0.2 m、支承层厚度0.4 m、基床总厚度0.8 m、基床压实指标K_(30)(110 MPa/m)。

Joint Optimization Analysis of Tack and Subgrade of Modern tram

In order to get the optimal design parameters of typical track subgrade,the space coupling model of track subgrade is established based on finite element analysis software ANSYS,and such five factors as fastener stiffness,track plate thickness,thickness of the support layer,the total thickness of subgrade and subgrade compaction index K_(30) related to the track subgrade stress and deformation effect distribution are studied with orthogonal test method. Based on the range analysis method,the importance order of factors affecting the technical index and economic index of the track subgrade design scheme is determined. At the same time,the total thickness of the subgrade is taken as an index toanalyze the difference between the joint design method and the traditional roadbed design method. The results show that the track subgrade joint design method is more economical and reasonable than the traditional single design method; considering the technical and economical indexes of rail subgrade design,the optimal fastener stiffness is 40 k N/mm,the optimal thickness of track plate is 0. 2 m,the optimal support layer thickness is 0. 4 m,the optimal total thickness of subgrade is 0. 8 m,and the optimal subgrade compaction index is K_(30)( 110 MPa/m).