论文部分内容阅读
The bending stress and displacement distribution of track slab and support layer due to train load was studied using the beam-plate finite element model on elastic foundation when different type and modulus of support layer were used.The results show that the support layer type have great impact on the displacement of support layer and the stress on subgrade,but have little impact on the bending stress of track slab and support layer.The continuous support layer and articulated support layer with shear transfer device at their ends are recommended.In order to restrict the stress in support layer to be less than that in track slab,the modulus of the continuous support layer,the unit support layer and the articulated support layer should not be larger than 15GPa,22GPa and 20.5GPa respectively To restrict the step in support layer to be less than(1)mm,the unit support layer modulus should not be more than 20GPa.