Study On Dynamic Characteristic Of Combined Structure Of Metro Station And Highway Tunnel Under Vehicle Load

With the rapid development of rail transit system in maj or cities in China,the network of urban rail traffic,such as subway,becomes more and more intensive,it is common that the new line will be combined or intersected with other underground projects in road network.In order to develop and utilize urban underground space reasonably,two underground structures with different functions can be built together to form a combined structure.Aiming at the construction of metro station and undercrossing highway tunnel in Chengdu Metro,we do some research about dynamic response of combined frame structure of subway station and road tunnel,under the vibrating load of trains and motor vehicles.The main research contents and results of this paper are as follows:(1)We build two-dimensional and three-dimensional models,by means of the static algorithm of vehicle load.After comparing and analyzing the calculated results,then we can get regular about displacement of soil layer,vertical additional stress,internal forces of combined structure.(2)Using mobile harmonic load model,from three points-displacement,stress,acceleration,we analyzed the dynamic response of the combined structure when it is under the load of motor vehicle load and subway train separately.So that we can get dynamic response rule about combined structure.(3)Analyzing the dynamic response of the combined structure when several motor vehicles and both train on the left and right passed by the tunnel of combined structure.Furthermore,analyzing the safety of combined structure by calculating safety factor,and putting forward the corresponding engineering measures towards weak part of combined structure at the same time.Then analyzing and calculating the impact of vehicle noise on urban environment.