Optimization analysis of modern tram embedded track composite foundation

Abstract

In order to analyze the key parameters of tram embedded track composite foundation and get the optimal combination of parameters, the finite element method is applied to establish the calculation model of embedded track composite foundation. Based on the existing research, the influence of five key factors, such as the thickness of track plate, the thickness of supporting layer, the elastic modulus of pile, the diameter of pile and the longitudinal spacing of pile, on the stress and deformation of embedded track composite foundation is studied by orthogonal test. The results of the calculation are analyzed with the difference analysis and variance analysis, and the key factors and the optimal combination of parameters are obtained. The results show that the orthogonal test method can greatly reduce the number of tests on the basis of ensuring the correctness of the analysis results. The elastic modulus of pile has the greatest influence on the vertical displacement of rail. The thickness of supporting layer has the greatest influence on the longitudinal bending moment of track plate, and the pile diameter has a great influence on the vertical displacement of rail. The longitudinal spacing of pile has a great influence on the vertical displacement of rail, longitudinal bending moment of track plate and longitudinal tensile stress of supporting layer. Therefore, when determining the longitudinal spacing between piles, the service performance of track structure and the cost of composite foundation should be considered comprehensively. The design scheme of optimal tram embedded track composite foundation is the thickness of track plate 0.20 m, the thickness of supporting layer 0.26 m, the elastic modulus of pile 280 MPa, the diameter of pile 0.75 m and the longitudinal spacing of pile 1.40 m. The results of this study have reference value for the design of tram embedded track composite foundation.