Test Study On Dynamics Of Rigid Subgrade And Transition Performance On Suiyu Railway

With the increasing speed of railway , the rapid development of high-speed railway and expressways, road and railway traffic conditions to enhance various traffic safety and comfort becomes increasingly important in recent years. An important link of impacting traffic safety and comfort is the transition issues of the subgrade and bridge. Mountain railway is restricted by terrain , includeing a lot of the short subgrade of the bridge and bridge, the tunnel and bridge, the tunnel and tunnel. Short subgrade between the bridge and tunnel has a greater impact on travelling comfort,safety, beside, The construction process of the transition between the subgrade and bridge, the subgrade and tunnel is more complex because of too short distance; Therefore C15 concrete of larger stiffness is used as a transitional link between the short subgrade less than 150m between the bridge and bridge, the bridge and tunnel and the tunnel and tunnel.The track of connecting department between the subgrade and abutment (tunnel) will be different displacement when the train passed, load of train have a greater impact on track structure, and reduce smooth, comfortable, safety. So a certain length of the transition will be required to this end of abutment, the transition will be ensured the smooth and safety operation of the train, which links are called transition of the subgrade and bridge (tunnel). Road and railway unavoidably exist the transition, there are its own uniqueness besides all the features. At the same linking lots, which the transition is between the subgrade and the horizontal structures of bridge (tunnel), etc, because the two materials are different vertical stiffness at the same linking lots between the subgrade and horizontal structure of bridge (tunnel), etc, and will be suddenly changed, and larger differences in the emergence and existence of the settlement, it makes road smoothly no longer, it will inevitably lead to traffic conditions of lots connecting deteriorate.The dynamics character of the transition of short subgrade are on the basis of related information of technologies, which be comprehensively analyzed, According to the"the increasing speed to 200km/h of railway" project of Suiyu line with the Ministry of Railways. the following main conclusions:â‘ Dynamic response of the longitudinal distribution of the rigid subgrade transition section on Suiyu railway was analyzed under load of train; â‘¡ The relations of train speed and dynamic stress , vibration deformation, vibration speed, vibration acceleration was studied; â‘¢The dynamics performance of short rigid subgrade between the bridge and tunnel was influenced by the train heading; â‘£ The data from rigid subgrade transition section is compared and analysed with that from normal subgrade transition section. The result indicate that great stiffness difference between the subgrde and bridge is successfully solved by setting rigid short subgrade. It...