Research On The Dynamic Response Laws Of The Over Cross Tunnels Due To High-Speed Train Loads

With the rapid development of high-speed railway constructed in China,more and more over cross tunnels were being built.With the train vibrating load,this article studied the dynamic response characteristic of over cross tunnel in the operating period.Firstly,three-dimensional numerical calculation model is established,and then used the finite difference software to numerical simulation computation and analysis.On this basis it studied the dynamic response characteristic of over cross tunnel by the different train passage ways.And then it analyzed the sensitivity of the maximum main stress with lining structure by different influencing factors.According to the different influencing factors,it divided the influential partition through the orbital direction.The main research content was as follows:Firstly,with three different methods of the train vibration load,it studied the dynamic response characteristic of over cross tunnel.To reflect the train load impact on cross over tunnel dynamic response,it mainly used the lining structure of the displacement response and the acceleration response and the stress response.It analyzed displacement-time curve and acceleration-time curve and stress time-history curve.The results showed that compared with the conventional section,the cross section was more dangerous.Secondly,with the intersection of train vibration load of the cross tunnel and the undercrossing tunnel,it analyzed the sensitivity of the lining structure by different factors.These factors included the level of surrounding rock and the train speed and the clear distance and the buried depth of tunnels.Finally,based on the standard of the maximum vertical displacement of track bed,it divided the influential partition through the orbital direction,which was by the level of surrounding rock,the train speed,the clear distance and the buried depth of tunnels.The vibration-proof is analyzed with the dangerous condition.