The Influence Of Subway Vibration On The Surrounding Area

With the rapid development of our social economy and urban rail transit construction vigorously,the negative effects of subway vibration is paid more and more attention by people.Therefore,it is an very important research topic to study the influence of vibration caused by urban rail transit on the surrounding area.In this paper,the Suzhou Metro Line 4,which is about to be opened is used to study the influence of subway vibration on the surrounding area:(1)Through the development of field test scheme of Suzhou Rail Transit Line 2has conducted on-site test,the vibration acceleration along the subway near the ground vibration acceleration time history and online time tunnel is got.Then,the data of the measured data is pretreated.Through the data pretreatment,the processing result is as close as possible to the actual vibration signal.Through the spectrum analysis,the signal pre-processing after 1/3 octave analysis under different frequency and acceleration level analysis of variation curves,the subway vibration caused by the ground around the measuring point response and attenuation law.(2)According to the numerical simulation of the vibration of urban rail transit,this paper uses the finite element software ANSYS to analyze the train soil structure.In the process of modeling,it is one of the key factors that affect the results of the analysis to choose a reasonable artificial boundary.Therefore,from the perspective of the theory of open source problem of linear system,and then explains the theory of viscoelastic boundary,transmitting boundary and one or two order boundary,finally a small model to analyze the above four kinds of different boundary,finally proves the superiority of the two order transmitting boundary when dealing with complex problems.(3)First of all,combined with the domestic and foreign scholars’ research results on the train vibration load,the method of determining the vertical load of train vibration is determined.By using MATLAB software,the vertical acceleration time history is transformed into the vertical force,which is loaded on the finite element model.Then the size of the mesh size,the time step and the damping ratio are determined,and a more accurate two order transmission boundary is used to simulate the actual engineering situation.Finally,the ANSYS software is used to simulate the actual time and frequency spectrum of the actual test point.(4)In this paper,the corresponding results and conclusions are drawn from the study of the vibration induced by rail transit,some suggestions are put forward for thepossible problems in urban rail transit construction.