The Research On The Effect And Optimization Of Discontinuous Vibration Isolation Barrier For Rail Transit

In recent years,with the rapid development of society,rail transit has developed rapidly as a fast way of travel and transportation.The development of rail transit has a good impact on economic construction and people's livelihood,but the vibration pollution problem is also becoming serious.It will not only affect surrounding buildings and precision instruments,but also affect people's physiology and psychology.Vibrating pollution has been listed as one of the seven major environmental hazards in the world,and rail transit vibration has been a major part of it.At present,there are two main ways to control the vibration of rail transit.They are vibration isolation in the vibration source and vibration isolation during the propagation process.The vibration isolation at the vibration source needs to be implemented during the construction process.For the existing rail transit facilities,it is necessary to provide vibration isolation measures on the propagation path,and this method is also widely used in practical engineering.In this paper,the finite element analysis method is used to study the vibration isolation effect of different discontinuous vibration isolation measures and the factors affecting the vibration isolation effect,the depth optimization of the piles,and the vibration isolation trend of the piles under single point vibration.Complete the following work:(1)The model test was established and tested.At the same time,the finite element model of the same size was established and its finite element analysis was completed.The comparison of the two results was carried out to verify the validity of the finite element analysis in the vibration and vibration isolation of the rail transit.(2)Compare the vibration isolation effect with vibration isolation measures and vibration isolation measures.The vibration isolation effect of the row pile is the best,the special-shaped pile is the second,and the vibration isolation effect of the empty well is the worst.Increasing the depth and section size of the vibration isolation measures can improve the vibration isolation effect,and the influence of the spacing on the vibration isolation effect is not obvious.The vibration isolation effect of the hollow pile of the special-shaped pile decreases with the increase of the hollow ratio.Filling soils with different densities has a relatively small effect on vibration isolation The change of the external shape is more obvious than the change of the internal shape on the vibration isolation effect.The vibration isolation effect of the circular pile is better than the square pile.(3)Correlating the depth of the concrete pile with the wavelength ? of the vibration wave.The influence of different factors on the better depth is small,and the better depth of the row pile is about 0.8?-0.9?.(4)The principle of vibration isolation of row piles is studied.The ground plane including vibration source and row pile is taken as the research object.The vibration isolation effect will generally get better as the number of vibration isolation piles increases.Excessive spacing of piles will make the vibration isolation effect of the piles unsatisfactory,but reducing the spacing of the piles will not improve the vibration isolation effect of the piles.As the distance between the vibration source and the row pile is reduced,the vibration isolation effect is getting better and better.The effect of row piles on the vibration isolation of medium and high frequency vibration is not ideal,but the vibration isolation effect on low frequency vibration is better.