Research On Load Determination And Vibration Analysis Method Of Auxiliary Facilities In Subway Tunnel

With the rapid development of the metro industry,more and more ancillary facilities have appeared in the subway tunnel to assist the operation of the subway and create commercial value.Because the subway tunnel is in a very complicated environment,under the superposition of various loads,the auxiliary facilities such as advertising light boxes in the subway tunnel are prone to vibration and damage such as falling off and tearing.If the auxiliary facilities are accidentally dropped To the track,it will have a great impact on the structural integrity and operating conditions of the train.Therefore,the study of the vibration response of the relevant facilities is one of the important factors that determine the safe operation of the subway.I am concerned about the problems such as the falling light and the damage of the advertising light box and the tunnel fire door in the subway tunnel,and the piston wind flow characteristics,wind pressure load and vibration load of the facilities such as the advertising light box in the real subway shield tunnel section.And analyze the vibration response law of different loads for the ancillary facilities.The main research contents include:(1)Establishing the wind speed model of the subway tunnel piston,based on the fluid continuity equation and the Bernoulli equation for different forms of subway tunnels:the wind tunnel and the windless well tunnel,the piston wind speed model is derived and the corresponding model is established.After comparison with SES software,this model is used to study the variation law of piston wind speed in tunnel under different working conditions such as length,speed,length of wind shaft and position of wind shaft.(2)In order to analyze the wind pressure distribution law in the subway tunnel;the piston wind pressure model of the subway tunnel is established,and the piston wind model of the real tunnel is established by using the dynamic grid technology,and the model is verified by comparison with the literature data.The accuracy of this model is used to study the real subway tunnel and analyze the distribution and change law of the piston wind pressure at different positions,times and speeds.(3)The vibration response of the train-wheel-rail vibration load to the tunnel structure is studied,and the vibration response model of the subway tunnel is established.The model is fully considered in the model;the wheel-rail contact state and boundary are determined according to the actual operating conditions.The conditions are selected and determined;and the real process of train driving in the tunnel is simulated by reasonable train dynamic load application method;the simulation results are compared with the measured data to verify the accuracy of the vibration response model.(4)Based on the vibration load model and the wind pressure load model,based on the transient response equation,a vibration response model for the auxiliary facilities of the subway tunnel under multi-load superposition is proposed.The vibration response of the subway tunnel and its ancillary facilities is only affected by the wind pressure load,only the vibration load and the superposition of the two loads.At the same time,the variation law of the most unfavorable points of the auxiliary facilities under different loads is studied.The vibration study of the auxiliary facilities of the subway tunnel provides new ideas.