Research On Application Of Hexagonal Section Pile In Road Vibration Reduction And Isolation

With the continuous development of my country’s urban and rural economy,the urban and rural road network is becoming denser,there are many roads passing through the village,and the buildings are also close at hand.In the process of road construction and operation,the vibration and environmental pollution caused by construction loads and traffic loads on adjacent buildings have become increasingly prominent.In view of this,relevant vibration isolation measures should be proposed to reduce vibration pollution.The commonly used method is to set up vibration damping and isolation measures between the vibration source and the building.Therefore,this proposes a new type of regular hexagonal cross-section concrete piles to study the influence of pile layout and geometric parameters on the vibration isolation effect.Then use the numerical simulation software to further analyze the difference between the construction load and the traffic load of the building.The vibration response law under the action and the vibration response law after vibration isolation measures are set.Get the following conclusions:(1)The vibration isolation effect of the row of piles is studied through indoor model tests,and it is found that the number of rows of piles with a regular hexagonal section has a greater impact on the vibration isolation effect;under the action of low-frequency loads,the spacing between three rows of piles and three rows of piles are reduced It has a great impact on the vibration isolation effect;the vibration isolation effect of the variable row spacing of three rows of piles is equivalent to the vibration isolation effect of the equal row distance,and the vibration isolation effect of the equal row distance is even better than the vibration isolation effect of the variable row distance.Under the action of medium and low frequency loads,the reduction of the three-row pile spacing has a greater impact on the vibration isolation effect;Whether it is double-row piles or three-row piles,the diamond arrangement is slightly better than the rectangular arrangement.(2)A 1:1 model was established with the numerical simulation software and the model test was compared.It was found that the results of the two under the same working conditions were basically the same,which also verified the effectiveness of the numerical simulation software in the analysis of vibration reduction and isolation.The simulation study of the vibration isolation effect of three rows of piles under different geometric parameters found that the pile length of the row of piles has a greater influence on the vibration isolation effect,and the influence of the pile section size is relatively small.(3)Establish roadbed-foundation-building model through numerical simulation software,analyze the response law of road traffic load to the building vibration,and then set a single row of piles between the vibration source and the building to change the vibration isolation position.Analyze the changes in the vibration response of the building.The results show that as the vehicle speed increases,the radial maximum acceleration of the building hardly changes,and the vertical maximum acceleration increases slowly,but the increase is not significant.As the distance from the vibration source increases,the radial acceleration of the building attenuates differently on different floors.For vertical acceleration,the attenuation rate of acceleration on each floor of the building is basically the same.After the single-row vibration isolation piles are installed,the radial acceleration of each layer of the building does not change much.For vertical acceleration,the vibration isolation effect of the row of piles set at13 m away from the vibration source is the best.(4)Establish a foundation-building model through the numerical simulation software,analyze the response law of the impact load of the rammer to the building vibration,and then set a single row of piles between the vibration source and the building,change the vibration isolation position,and analyze the building vibration response changes.The results show that with the increase of the punching energy level,the acceleration gradually increases,and the growth trend is basically the same.As the distance from the vibration source increases,the attenuation speed of radial and vertical acceleration is basically the same.After installing a single row of vibration isolation piles,the radial and vertical accelerations of each layer of the building are attenuated,the row of piles is set at a distance of 13 m from the vibration source to achieve the best vibration isolation effect.