Analysis on mechanical characteristics of the polyurethane base plate for ballastless track of high speed railway

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In this paper, test method is used in giving tensile strength test, elongation at break test, permanent compressive deformation, oil resistance test and dynamic and static stiffness test to the aging and non-aging polyurethane base plates, and it is used in analyzing influence of the mass ratio of bi-functional and tri- functional mixed polyethers on the relevant mechanical characteristics of polyurethane elastic base plate. The research conclusions indicate that: when using polyurethane in potting filling of the gap between track and concrete roadbed, the high-speed roadbed shall seldom show subsidence and deformation; when not giving potting filling, the whole railway ballast shall show a subsidence about 50mm after 100, 000 times of cyclic loading, and the deformation shall be very serious, which could indicate the obvious effect of the potting filling of polyurethane. When tri-functional mixed polyether has the maximum proportion, the polyurethane base plate before aging and the non-aging polyurethane base plate shall all have the maximum tensile strengths and the minimum compressive deformation of 2.91%. Along with increment of the proportion of bi-functional mixed polyether, tensile strength of polyurethane base plate shall reduce gradually, and elongation at break of polyurethane base plate shall increase continuously. 20:80 proportions of bi-functional and tri-functional mixed polyethers can be used as design standard of the polyurethane base plate.