Study On Characteristics And Control Methods Of Buildings Vibration And Noise Induced By Adjacent Urban Rail Transit Underground Lines

The rapid development of urban rail transit has brought about environmental vibration and noise problems that cannot be ignored while facilitating the daily travel of residents.Among them,the vibration and secondary noise of adjacent buildings induced by rail transit have caused widespread concern and research,which will not only affect the daily life of residents,but also affect the use of vibration and noise sensitive buildings such as ancient architectures,laboratories and studios.As the urban land resource becomes more and more stressed,the horizontal distance of the subway line from the surrounding buildings is getting closer and closer,and the situation of the subway passing through the building is gradually increasing,which will further aggravate the vibration and secondary noise of the building.Moreover,most of the current researches focus on linear lines.The wheel-rail relationship of subways in curved sections is more complicated,and it is more difficult to conduct vibration and secondary noise theoretical analysis.Based on the vibration and noise reduction design of a building nearby subway line in Beijing,this paper establishes a dynamic analysis model of the metro vehicle-foundation-soil-building dynamics model based on multi-body dynamics theory and finite element simulation method.The interaction mechanism of subway vehicles,tracks,tunnels and other structures is considered in detail,and the vibration responding vibration and noise analysis of vehicles,tracks,soils and buildings is realized.Based on this method,the vibration characteristics and noise characteristics of adjacent buildings induced by urban rail transit underground lines are studied,and the influence of dynamic parameters and vibration isolation measures on vibration and noise of buildings is calculated.Suggestions for vibration reduction design of the subway lines are proposed.The main work done in this thesis is as follows:(1)Conducted research on the analysis and prediction methods of environmental vibration and secondary noise at home and abroad.This paper summarizes the prediction and evaluation methods of environmental vibration and the secondary structure noise in buildings caused by underground railways and urban rail transits at home and abroad,then summarizes the current research deficiencies,which will be used for subsequent modeling and theoretical analysis provides the basis.(2)Established a simulation analysis method for building structure vibration and secondary noise induced by urban rail underground lines,simulating the response law of building indoor vibration and secondary structure noise.Based on the line and building data,the simulation analysis method of building structure vibration and secondary noise induced by urban rail underground line is established,including the vehicle-track sub-model based on multi-body dynamics and the tunnel-soil-building dynamics sub-model based on finite element method and the indoor secondary structure noise prediction sub-model based on the boundary element method.The reliability of the model are verified by comparison the calculated results with the measured results.(3)The vibration characteristics and noise character:istics of environmental vibration and structural secondary noise of urban rail underground lines are analyzed,and the influences of load,speed and other related parameters on vibration and noise characteristics are analyzed.Based on the analysis model,the dynamic effect of vehicles,tracks,tunnels,soil and buildings is studied.The transmission law of train-induced vibration in tunnels and soil structures in urban rail underground sections is studied.The time domain,frequency domain distribution and characteristics of the secondary noise of the structure,and the influence of parameters such as load and driving speed on the vibration and secondary noise of the building structure are analyzed.(4)The damping effects of different vibration isolation measures are studied,and the influence of the parameters of vibration isolation measures on the vibration caused by the subway is analyzed.Based on the analysis model and vibration transmission law,the vibration damping effect and influence law of the vibration isolation are studied,including groove depth,width,position,filling material and culvert position.The parameters relavant to vibration isolation piles such as the number of rows,position and pile diameter are studied,analyzing the vibration damping effect and influence law of the measures;the effect of using vibration-damping fasteners is also analyzed.All these analysis are to provide useful suggestions for the vibration isolation design of buildings along the subway,concerning various influencing factors.