Analysis Of Pneumatic Effect Of High-Speed Train On Underground Station Shield Gate

With the development of high-speed railway in China,the urban land tends to be tense,and the underground high-speed railway stations came into being.The train wind caused when the train expressway passes through the underground station threatens the safety of the platform structure and the platform waiting personnel.Setting up the platform screen door can effectively reduce the influence of the train wind on the waiting personnel in the platform,and improve the waiting comfort.After the screen gate is set on the platform,the transient pressure generated by the train highway crossing will impact the platform safety protection device.The pneumatic effect of the high-speed train passing through the underground platform is of great reference significance for the structural strength design of the platform shield door.This thesis is based on three-dimensional,incompressible,steady fluid,using viscosity N-S equation,k-ε equation model,with Beijing Daxing international airport underground station for the engineering background size model,using sliding grid technology,based on different screen door opening and closing mode,train speed and intersection mode,establish numerical model.The influence of the pneumatic effect on the platform screen gate is analyzed.The study results are as follows:When a bicycle passes through the double-line underground station,when the train does not pass through the shield gate period,the wind pressure time curve of the bilateral shield gate highly coincides.The peak of positive pressure,peak of negative pressure,peak of pressure difference and peak of pressure gradient on the near shield gate of the train passing period are all greater than the distal shield gate.Through the underground platform,the positive pressure peak occurs at the entrance of the station;when the train meets,the positive pressure peak occurs in the middle of the platform when the train meets,and the peak positive pressure at the entrance of the platform is greater than the bicycle passing peak.When the train crosses,the aerodynamic effect on the main line shield gate is greater than the no stopping state on the starting line.When the double car intersection,the positive pressure peak in the open state is greater than the closed state,and the peak negative pressure and the pressure gradient peak are less than the closed state.