Research On Response To Vibrations Of Neighboring Buildings Caused And Vibration Isolation Measures By The Operation Of The Metro

The rapid development of metro construction,the continuous increase of operating mileage,and the ever-expanding coverage of metro lines have also brought many problems.Among them,the more obvious is the impact of vibration caused by train operation on surrounding buildings.Due to the shortage of land resources,the construction of buildings adjacent to subway lines cannot be avoided;Therefore,it is necessary to comprehensively consider the impact of vibration caused by the operation of the meter on the surrounding environment.Understand the law of propagation of the vibration generated by the operation of the meter in floors and buildings,and setting up reasonable and feasible vibration isolation and damping measures are of great practical significance for realizing the high-quality development of the city.In this paper,a numerical simulation method is adopted,based on theories related to finite elements and wheel-rail dynamics,to study the law of propagation of the vibration generated by the operation of the metro in the depot and adjacent buildings of the operational section.and proposes the separation of waste rubber tires under empty trenches and different filling forms vibration effect.The main content of the research and the conclusions of this paper are as follows:(1)Vibration propagation law and vibration control measures in the soil and buildings from three aspects of the vibration generating mechanism,summarize the results of current research on the response to vibrations of neighboring buildings caused by subway operation and clarify the vibration assessment indicators used in this paper.(2)Taking the metro type B wagon as the research object,the vehicle-rail model is established to calculate the vertical wheel-rail force used as a drive for subsequent model loading;when creating the model for ground and tunnel construction,fully consider the selection of various parameters and compare the precision of the model with the literature.(3)The law of propagation of vibrations in buildings adjacent to the tank under typical conditions is studied,and the law of response to vibrations of buildings under the influence of different forms of foundations,operating speeds of the train and the distance between the building and the parameters of the road.they are compared and analyzed.The results show that the horizontal and vertical acceleration values of the pile foundation building are less than those of the raft foundation,and the vertical and horizontal acceleration of the floor slab changes as follows: as speed increases of the train,increases gradually,and as the distance increases and decreases gradually.(4)Based on the finite element model to study the vibration isolation effect of different sizes of hollow trench vibration isolation barriers,and on this basis,study the rubber insulation effect of insulation rubber insulation be filling.The conclusion is as follows: the depth of the vibration isolation trench is the main factor affecting the vibration isolation effect;different measures of isolation can be selected from vibration to vibration to vibration to vibration to vibration and frequency band.When it is closer to the source,the frequency band is less than25 Hz,the use of the tire debris filling barrier can achieve the ideal vibration isolation effect.the tire filling barrier is best in the 25-40 Hz frequency band,and the hollow groove vibration isolation is used above 40 Hz frequency band the best results.when the distance is longer,the tire debris filling barrier effect is the best in the entire frequency band.The vibration amplification trend of tire soil filling obstacles is the most obvious.this is because the discarded tires are circular ring-shaped.When the tires are fully filled with soil,a "hoop effect" will occur,causing the surrounding soil the layer stiffness increases.