Research On The Response Of Tunnel Group Under The Ground Vehicle Load

In recent years,many cities are vigorously developing underground rail transit in order to alleviate road traffic congestion.Urban metro tunnels are generally shallow-buried,and most of them are located under existing urban roads.The increasing traffic volume on the road makes the traffic load increase sharply.The vehicle load inevitably has dynamic impact on the tunnel structure,meanwhile,the phenomenon of overloading occurs commonly.In order to evaluate the influence of ground traffic load on the stratum and supporting structure of the tunnel better,especially in the construction process of the subway tunnel,it is crucial to study the influence of traffic load on the Shallow-buried tunnel.Therefore,relying on the metro tunnel at the southern end of Zhifang Street Station of Wuhan Rail Transit Line 27,this paper studies the dynamic response of the tunnel during construction by means of numerical simulation and field test.The main contents and conclusions of the study are as follows:In this paper,the dynamic response of stratum and structure of three-line parallel tunnels under no traffic load and traffic load is studied.The space effect caused by the construction of the three-line tunnel is analyzed in the case of no road traffic load.The influence of the speed and load of the traffic load on the dynamic response of the tunnel is studied in the case of road traffic load.Through the comparative analysis of the displacement and acceleration response,it is considered that the existence of the vehicle load has a great influence on the displacement,but the change of the speed has little influence on the displacement.The change influence of load is greater than speed.In this paper,only a few changes of the vehicle passing time are studied.The actual vehicle is cyclic,not only has a long-term effect,but also the vehicle loads on it will accumulate.In practice,the cumulative action time will be long and the number of actions will be many,so this effect can not be ignored.The simulation results of ANSYS are compared with the measured ground subsidence,vault subsidence and horizontal clearance convergence,which verifies the rationality of the numerical simulation in this paper.Figure[44]table[7]reference[61]...