Theoretical And Experimental Research On The Mechanical Properties Of Bi-block Ballastless Track Under Train Load

The ballastless track has a broad prospect in China because of the advantages of high comfort,high stability and low maintenance. Along with the building of our country passenger dedicated line,the ballastless track has got rapid development and extensive application.And many kinds of ballastless track such as slab track and bi-block ballastless track have formed.Under the repeated load of the high-speed train with high density, the ballastless track structure is likely to produce all kinds of damage,so it is necessary to research the mechanical properties of ballastless track.The existing studies are based on theoretical analysis, but experimental validation is scarce.Therefore, it is very important for the design and construction of passenger dedicated line with the experimental research on mechanical properties of the ballastless track structure system under train load.Taking the CRTS I bi-block slab track structure on bridge as the research object,and using1:1full scale model test,the paper studies the mechanical properties of the CRTS I bi-block ballastless track structure with1:1full scale model test.And using the finite element method to build the beam-plate and beam-solid theory model.Through the comparative analysis, to verify the correctness and adaptability of the beam-plate and beam-solid theory model of CRTS I bi-block ballastless track.The main contents of this paper are as follows:1. Formulate a testing program of CRTS I bi-block ballastless track structureAccording to the actual construction process, established1:1full scale model of the CRTS I bi-block ballastless track structure.Based on the content of the mechanical properties, Formulate the component arrangement method of test content and loading scheme.2. Test the model materials performance and the fastener static stiffness of WJ-8C type.According to the requirements of the relevant specification,tested the model materials performance and the fastener static stiffness of WJ-8C type which obtained at1:1full scale model.3. Established the CRTS I bi-block ballastless track structure modelAccording to the theory of beam-plate and beam-solid, established the beam-plate and beam-solid model that be used to the design of ballastless track by using the finite element platform of ANSYS.By comparing the test results with the calculated results, to verify the correctness and adaptability of the beam-plate and beam-solid theory model of CRTS I bi-block ballastless track.4. Studied the effects of concrete and reinforced mechanical properties with the change of fastener stiffness, slab thickness and base thickness under train loads.