Caculation Of The Gap Between CRTS Ⅱ Slab And Mortar And Analysis On Its Influence Characteristic Of Track Dynamics

Abstrct:With a lot of construction and application of CRTS II ballastless track in our country, in the process of construction and operations, some deficiencies and weaknesses of track structure are found gradually. In the light of gap between slab and asphalt cement mortar layer, the article establishes the track structure model to make systematic theoretical caculation and analysis by ANSYS. There are the following several main contents:(1) Respectively caculate and analyse stress and strain of slab and mortar layer under3working conditions (a. slab and slab have not been yet longitudinal connected; b. slab and slab have been longitudinal connected but not been restricted by rail; c. slab and slab have been longitudinal connected and restricted by rail and fasteners) of ballastless track structure on bridge and roadbed, and positive and negative two temperature gradient load. In the process, we consider2connection styles of complete bond and only touch.(2) Respectively caculate and analyse stress and strain of slab and mortar layer on the bridge and roadbed under the train static load. Then caculate and analyse stress and strain of slab and mortar layer on roadbed under the train traveling load. In the process, we still consider2connection styles of complete bond and only touch.(3) Establish the tempreture-structure model of ballastless track to calculate stress and strain of slab and mortar layer under coupling load of traveling train and temperature gradient.(4) Establish the model with gap to calculate stress and strain of slab and mortar layer under temperature gradient load, train static load, train traveling load, coupling load of train and temperature gradient. At last, we gain some conclutions:longitudinal connection between slab and slab can restrain gap well between slab and cement mortar layer, but rail and fasteners restrain it little; the gap destroys track structure fiercely.