Study On The Response Of Environmental Vibration Under Overlapping Multi-tunnels By Subway Train

With the acceleration of urban subway construction and the gradual encryption of the subway line network,the subway line planning is becoming more and more complicated,and multiple subway lines are running in parallel or overlapping at close distances.This situation causes environmental vibration and environmental vibration caused by subway operation.The distribution law of response is worthy of our attention,and environmental vibration is closely related to the lives of residents.Therefore,it is necessary to study the influence of porous overlapping tunnels on the surrounding vibration.In this paper,based on the problem of the surrounding environment vibration caused by the subway operation under the porous overlapping tunnel,we first investigated a resettlement site project,and established two vehicle-track coupling dynamic models and a track-porous tunnel-wall rock finite element model.Model,the above two models were jointly simulated to construct a vehicle-track-porous tunnel-surrounding rock vibration prediction model,the simulation calculation results were compared with the field measured data,and the environment caused by the single-hole tunnel was analyzed on the basis of verifying the accuracy of the model Vibration,the impact of different overlapping modes of tunnels on environmental vibration,and the impact of combined subway train operation on environmental vibration,analyze and evaluate environmental vibration in terms of time domain,frequency spectrum,and maximum Z vibration level VL_z,max.The main contents of this article are as follows:1.First of all,study and summarize the research status at home and abroad on vibration load,environmental vibration along the subway and the impact of environmental vibration caused by subway operation in overlapping tunnels,and put forward the technical route of this paper.2.The vehicle-track coupling dynamic model was established using UM,and the finite element model of track-porous tunnel-wall rock was established using the finite element software Ansys to form a vehicle-track-porous tunnel-wall rock vibration prediction model.The simulation calculation results Compare with the field measurement results in many aspects such as time domain and frequency spectrum to verify the accuracy of the model.3.System analysis Analysis of the ground environment vibration caused by subway operation under the single-hole tunnel,double-hole overlapping tunnel,three-hole overlapping tunnel and four-hole overlapping tunnel,and make a comparative study.4.Based on the research on the environmental vibration caused by subway operation under the aforementioned overlapping tunnel,the impact of the following combined vehicle operation on the environmental vibration in the porous overlapping tunnel is analyzed.