The Effect Of Low Frequency Vibration On Free Space And Adjacent Buildings

With the rapid development of the national economy,the construction of infrastructure is also particularly hot.At the same time,in the roadbed construction,train driving and other processes will produce low-frequency environmental vibration.Low-frequency vibration is usually relatively low frequency vibration,it is difficult to avoid and the duration is relatively long,resulting in direct and indirect hazards are relatively large,more and more people's attention.The low frequency vibration,which has great influence on people's life,mainly includes two kinds of low frequency vibration caused by the construction process(such as vibration compaction of vibratory roller)and the low frequency vibration generated during the operation of the train.In this paper,the construction site of TLSG-1(by the construction contract of CCLEC)and TLSG-2(by the construction general contract of China Railway 14 Bureau)is taken as the research object.Propagation and attenuation theory,the velocity time history curve,spectrum diagram and the finite element software are used to simulate the free space and the adjacent buildings at different measuring points of the vibration of the vibratory roller.The following results are obtained:(1)The vibratory attenuation curve of the Fuxin area under the action of the roller is obtained by using the signal collector and the signal analysis software such as the shock absorber to carry on the field measurement to the vibration of the roller,and the corresponding attenuation law is summarized and the safe vibration range is determined.(2)Through ANSYS finite element software,the moving load is applied to the model,and the hard soil and soft soil of the construction area are simulated and compared.The influence of different soils on the vibration attenuation law is obtained and the reason is analyzed.The numerical simulation shows the variation law of the vibration velocity in the building,and the concrete influence of the low frequency vibration on the structure of the building is analyzed by the stress deformation cloud.(3)The isolation ditch is set up in the field to reduce the influence on the surrounding environment during the construction of the vibratory roller.The effect of different depths on the vibration attenuation law is obtained by measuring the vibration isolation effect of the different trench at different depths.Field measurements ensure a smooth solution to the problems associated with vibration of the roller.