Study On Vibration Isolation Measures Of Low Frequency Vibration Induced By High Speed Railway

With the rapid development of cities and the continuous progress of modern industry,people’s travel and transportation problems become increasingly prominent.High-speed railway has the advantages of high speed,safety and comfort,less land occupation than highway,lower energy consumption than airplane,and strong transportation capacity.It has played an important role in promoting the development of world economy and improving people’s living standards.As a result,high-speed railway has been widely developed in the world.However,with the increase of train speed,the impact of vibration and noise generated by high speed on the living and working environment of residents along the line is also growing,especially for some buildings sensitive to low frequency vibration,such as laboratories,hospitals and theatres,so the impact of vibration on the environment has reached a point that must be paid attention to.Based on the rapid development of high-speed railway in the future,it is necessary for Super to study effective vibration isolation measures.In this paper,the influence of wave vibration caused by high-speed train on the surrounding environment and the effect of vibration isolation measures are systematically analyzed by combining theoretical analysis with numerical calculation.Based on the vibration isolation measures of honeycomb wave blocks(HWIB),the vibration isolation of pile honeycomb wave blocks(P-HWIB)is studied.This kind of vibration isolation is constructed by the method of foundation treatment or soil reinforcement.CFG piles are directly driven into the soil layer to form a honeycomb structure,which can play the role of row piles and obtain good results in vibration isolation.The cost and method of construction can also be well solved.Firstly,the numerical calculation model of viaduct pier foundation is established.Then,the model and material are defined.Then,the load and boundary conditions are applied and the element mesh is divided.The analysis steps are established and calculated.Finally,the post-processing module is used to analyze the calculation results.The vibration isolation effect of vibration isolation trench on high-speed railway is calculated.Then the vibration isolation characteristics of solid WIB and box WIB are calculated,and the vibration isolation effects of different wall thickness WIB are also analyzed.Finally,the comparison of vibration isolation effect between P-HWIB with different buried depth and P-HWIB with different honeycomb sizes is studied.Finally,the appropriate size parameters of P-HWIB are selected,and compared with the traditional vibration isolation effect,the vibration isolation effect of P-HWIB is obtained.From the view of vibration isolation effect,the effect of P-HWIB vibration isolation measure is better than that of traditional vibration isolation measure.Compared with the situation without vibration isolation measures,the surface acceleration can be reduced by more than 65% and the amplitude can be reduced by more than 78%.For low-frequency vibration bands with frequencies less than 10 Hz,P-HWIB has better vibration isolation effect than isolation trench,WIB and HWIB,and the amplitude can be reduced by more than 78%.In this frequency band,other vibration isolation measures can not achieve this effect.Therefore,P-HWIB is an effective vibration isolation method to reduce the impact of low-frequency vibration.