The calculating formula of shrinkage and tension stress of the pavement is set up on the basis of the friction between slab and base.

Through comparing the true sea bed with the interpolated sea bed,this interpolated sea bed is derived from surveying several typical sea bed along different survey line directions,and we discovered that the effect of different survey line direction on the sea bed display can be concluded into two effects: smoothness effect and flex effect.

Summarizing the literatures available and analyzing in situ experimental data, and based on the principle of interaction between beam and rail and the compatibility of deformation and boundary, the paper puts forward a new model for calculating longitudinal forces due to temperature variation in gapless track on continuous beam bridge in urban rail transit.

That was found after studying the interaction behavior between the railway bridge and CWR and the distribution rule of additional contractility.

Compare d with the conventional method, LM can overcome the accumulative errors,s o in the calculating of the additional contractility of BCWR (bridge continous w elded rail),LM method can be used on multi-span bridges, especially .