Abstract：Research purposes: Slab ballastless track will be cosmically paved for the first time in Shijiazhuang- Taiyuan passenger special line which is the only line combining high-speed passenger transport with heavy loads freight in China. There is no canonical calculational theory of ballastless track，so the mechanical rules of slab ballastless track should be studied thoroughly ,which can make the design economical and reasonable.
Research methods: Using the finite element theory，beam-slab model of slab ballastless track is built and the model calculation is caught by the finite element tool software ANSYS.
Research results: The mechanical rules of slab ballastless track affected by some main parameters，such as acting position of loads，stiffness of fastener breadth of slab，elastic modulus of CA mortar and elastic coefficient of foundation，are concluded and the worst moments of slab and pedestal under vertical load of train are calculated.
Research Conclusions: The calculational parameters are put forward in this paper as follows: dynamic stiffness of fastener is 60 kN/mm，breadth of slab is 2. 4 m，K30=190 MPa is adopted as elastic coefficient of foundation, which are suitable for slab track in Shijiazhang-Taiyuan passenger special line. In order to get the worst moments of slab and pedestal under vertical load of train，acting position of loads and elastic modulus dispersal of CA mortar should be considered，acting position of loads includes the middle of slab and the side of slab , and the elastic modulus dispersal of CA mortar contains 100 MPa and 300 MPa.
2007, Vol. 24 
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