The Three-dimenonmetn Freuency Domain Algorithm And Sensitivity Analysis Of Parmeter Of The Environmetn Vibration Caused By Subway Tunnel

With the economic developing,the city is expanding rapidly and urban population increasing dramatically,problems such as congestion,traffic congestion and noise pollution have cropped up.Subway has its own unique advantages in alleviating urban traffic problems,such as electric power utilization to reduce air pollution,lager passenger-capacity than cars and energy saving,using special road right,and therefore being more safe and convenient.But as the network plans increasingly-intense,the subway lines will be next or blow the city's vibration spot inevitably.In order to control the subway environment vibration and meet the city's need,a lot of damping measures have been taking in the subway lines.However,the basic research of traffic environment vibration standard lacks in China and the existing prediction methods are not accurate,which leads to the complaint of residents nearby subway lines about the new subway after operating a period of time.Analytic method is built on the basis of a large number of simplification and assumption,which can be used in theoretic research of the subway environment.But it does not apply to engineering applications.Empirical value method is based on a large number of tests,which is practicable and accurate.But it lacks applicability.With the rapid development of computer technology,numerical methods are the main trend of current research.Compared with the analytical method and empirical value method,numerical method cad establish a complex model,including the complex terrain,more buildings and complex operation conditions and so on.In order to guarantee accuracy,the model must be complex.Thus,numerical method's calculation time will increase greatly.How to improve the accuracy and efficiency of computing is the focus of numerical research.Because the key parameters of the prediction model in subway are rarely investigate,this article in focuses on the key parameters,forecasting and simplify the non-key parameters to improve the calculation efficiency and accuracy.Thesis main work is as follows:(1)Collect the domestic and foreign subway environmental vibration problems and research status.Sorted the domestic and abroad standards of the subway environmental vibration.Summed up the three main prediction methods of the subway environmental vibration.Analysed the corresponding advantages and disadvantages;(2)Carried out the study of environmental vibration of subway tunnel.This tested and analysed the environment vibration of Chengdu Metro Line 2 Yingbin Station and Chadianzi station;(3)Establish a 3D frequency domain algorithm of vibration of metro tunnel environment,including the vehicle-track vertical coupling frequency domain model and 3D finite element frequency domain model;(4)Studied the key parameters that affect the accuracy of prediction models,such as frequency-dependent stiffness and damping of rail pads,the geometric and physical parameters of soil of the prediction model;(5)Based on three-dimensional frequency domain algorithm of subway tunnel environment,this paper studied the visualization of vibration.Drawn the vibration map which can show the vibration intuitively.