The Research On The Subway Environment Vibration Prediction,Evaluation And Control

With the rapid development and expanding the size of urban rail transit, it is commonlyseen that subway and light rail across the ground floor of buildings and also build around thesurrounding buildings. Vibration caused by the movement railway vehicles may have variouskinds of influence on the use of the nearby buildings. In particular，it will be much moreprominent when there are precision instrument laboratory building, hospital, or ancientbuildings. Based on Beijing MTR’s experiments of "A integrated solution to vibrationinfluence on precision instrument lab building of Peking University by subway lines inHaidian District ", this article aims to research the vibration circumstances of the precisioninstrument lab building in Peking University where is surrounded on three sides by thecompletion of the subway. Adopted to a various methods of summarization, test, numericalsimulation and theoretical analysis and so on, the four aspects of subway vibration predictionand evaluation method, vibration test, train load calculation, vibration prediction evaluationare studied systematically in this thesis. And the main works and conclusions were shown asfollows:1Comprehensively summed up the parameters, criteria and indicators which areadopted to predict and evalute the subway vibration at current home and abroad."Guidelines of ambient vibration and noise evaluation of rail transit" proposed by theUnited States federal Railway Administration are carried out a detailed analysis andresearch. Finally put forward according to different spacing between target-vibrationalexcitation,exect different magnitude artificial incentive,the artificial incentiv should beaverage on the components as much as possible, and select proposed building rail-wayforce density function by use of the test result of existing Railway which have the sameform of ballast bed\train and tunnel.2Testing vibration of interval tunnels and vibration response of surface on Beijingsubway line4, it is turned out that there are different effects on ambient vibration at adifferent speed. The faster the train runs, the more effects it has. In the meantime, so thevibration of surface does. Therefore, both ground vehicles and metro, the vibration level at alocation away from the source has a tendency to enlarge.3The Euler–Bernoulli beam, which regards steel rail as Winker foundation,simulated type of track structure and divided the train loads into two parts of pseudo static andwheel/rail dynamic load. And it was studied the effect of quasi-static and dynamic load onwheel/rail, then added the two parts of load to get the train load acting on the subgrade.4Proposed subway line makes vibration prediction by means of numerical simulationand will increase vibration of the precision instrument lab building in Peking University and it is necessary to take corresponding measures to reduce vibration. Studied and analyzed theinfluence on the vibration by different forms of track structure and tunnel structure, we cansee that steel-spring floating slab enjoys its superior peformance in high frequency range, andat certain frequencies shield tunnel is more beneficial to vibration reduction than miningtunnel.