Study On The Propagation Law Of Vibration Generated By Subway

With the rapid development of city construction,effect of environmental vibration caused by rail traffic has become a problem that can not be ignored.The problem disturb the quality of the life of surrouding residents.It further influence the use function of the building,such as laboratiorise,hospitals and schools.Therefore,it is necessary to assess the impact on the surrounding sensitive buildings before the operation of subway.Currently,the prediction of subway vibration propagation law is based on numerical simulation,empirical or semi-empirical formula and measurement method.The rationality and accuracy of the evaluation system need to be checked by theory.This paper studies the the law of the amplification of the horizontal vibration by using the theory of elastic wave theory and geophysics.The paper raise the concept of amplification angle for the first time.The influence factors such as depth,soil parameters and vibration frequency on the angle is analyzed by numerical simulation.The application of this theory method combined with numerical simulation method,the standard formula method,engineering analogy method put forward a set of effective vibration prediction method.Through the above research,the following achievements:1.The concept of amplication angle is proposed for the first time,and it is explained that amplification area of surface vibration caused by the depth of tunnel is based on the constant angle.2.The effects of various factors on the amplication angle are analyzed by numerical simulation,and the results show that the angle reflects the propagation characteristics of the whole soil.The combination of different soils reflects the comprehensive energy consumption mechanism of the site soil,which directly affects the average vibration level of the ground surface.3.In this paper,the method of combining numerical simulation with theoretical verification is put forward,and the rationality and accuracy of the numerical simulation calculation are guaranteed in the whole evaluation system.