Analysis On The Vibration Absorbing Effect Of Filling Trench Barrier On Train Vibration

In recent years,with the development of social economy and the improvement of living standards,the speed and carrying capacity of the train are constantly improving,which greatly promotes the economic development of our country.At the same time,the environmental vibration problem is becoming more and more serious.The vibration caused by traffic can be transmitted through the nearby soil,and it will produce secondary vibration to the nearby buildings,which has an important impact on the structural safety and the daily life and work of the residents living in the buildings along the traffic line,and the huge economic loss is immeasurable.A large number of researchers have studied this problem.Open trench,open trench and filled trench have good vibration reduction and protection effect for small environmental vibration,but they can not give satisfactory results for large environmental vibration.Therefore,it is necessary to further explore new methods with better reinforcement effect in seismic design.Using it as a barrier on railway subgrade can reduce the impact of train vibration on the surrounding environment.It can also improve the bearing capacity of the railway and reduce the deformation and settlement of the railway.Environmental protection geobag is a kind of ecological synthetic material with high strength,anti ultraviolet,anti freeze thaw and anti-corrosion.In this paper,several new vibration isolation structures are developed based on barrier vibration isolation.Compared with the traditional vibration isolation structure,the new vibration isolation method can significantly reduce the environmental vibration caused by train vibration(1)in order to study the vibration reduction of the EPS foam board as the barrier of the filling tank on the train environment,in this study,the sand bag layer was used as the roadbed,and the stress,acceleration and vertical deformation of the subgrade soil under different train speeds were analyzed.The EPS foam board with different thickness is placed at a certain distance from the roadbed as a passive vibration isolation barrier.The vibration isolation effect of EPS foam board is studied.Using sand bag layer as subgrade has good vibration isolation effect.Under 15 kn train load,the acceleration of 25 cm depth is 65.6% of the subgrade surface acceleration.At the same time,the faster the train speed is,the more significant the vibration isolation effect is.When the simulated train speed increases from 108 km / h to 180 km / h,the vibration isolation effect increases by 7.3%.(2)Through theoretical research and model test method,the vibration reduction effect of the filled slot barrier is analyzed.A new type of vibration isolation device is invented and adopted,which is mainly composed of honeycomb concrete canvas and PE rubber water bag.The influence of this new type of filled ditch barrier on train environmental vibration is analyzed.When the simulated train speed increases,the damping effect of obstacles is improved obviously.It is worth mentioning that at the speed of 180 km / h,the amplitude at 1.5m behind the new barrier is 48.6% less than that before the barrier.(3)The environmental protection geotextile bag is used to protect the gravel subgrade slope,and the bottom two layers are used as the barrier of the filling groove.The vibration reduction effect of the environmental protection geotextile bag on the train is studied.It is found that the environmental vibration under the slope protection is significantly reduced compared with that without the slope protection under the larger dynamic response.