Honeycomb Wave Impeding Block Vibration Isolation Of High-speed Railway Track In Cold Region

The "Belt and Road" strategy and the framework of high-speed railways net plan have led the construction of Chinese high-speed railway to the next level.The increase in the running speed and running lines of high-speed railway inevitably aggravate the environmental vibration question,whose vibration and noise can affect the daily life of residents,the safety of buildings,the production of high-precision instruments and the operation of high-precision scientific experiments.The property of permafrost engineering is extremely sensitive to the change of the external environment.The engineering practice shows that the vibration caused by the running of the high-speed rail would damage the permafrost subgrade in the cold region,which is one of the important factors for the performance degradation of the high-speed railway subgrade.Therefore,the vibration reduction technology and vibration isolation technology of high-speed railway subgrade are of great significance in the cold region.On acc ount of the in-situ measured data,this paper systematically analyzed the vibration characteristics of the high-speed rail-railway track-subgrade-soil model in the cold regions based on numerical simulation,and proposes a honeycomb wave block vibration isolation technology suitable for frozen soil sites.Firstly,this paper established the dynamic model of high-speed railway subgrade-soil system under the effect of track vibration in the cold regions with the example of Harbin-Dalian high speed railway,analyzed the environmental vibration characteristics of high-speed railway and the response rules of subgrade and soil in different modes,and revealed the attenuation rules of environmental vibration caused by high-speed railway and the characteristics of the space-time evolution of subgrade and soil by comparing with measured data.Secondly,this paper analyzed the vibration isolation performance of the honeycomb wave block based on numerical simulation,and the results showed that the vibration of the rear side of the wave block attenuated obviously,which has a apparent vibration isolation effect for the vibration during the dominant frequency of environmental vibration.Then,this paper calculated the isolation effect of the honeycomb wave block vibration isolation element in different modes which considered factors such as vertical length,elastic modulus and internal filler.The results showed that the different parameters of the honeycomb wave block located have different control effects on the vertical acceleration amplitude and vibration level of soil surface.The vertical length and the internal filler played a key role in improving the vibration isolation effect.The control law of the parameters of the wave block on the vibration isolation effect is explored,and the design parameters of the honeycomb wave block were optimized.Finally,this paper analyzed the vibration response of subgrade and the isolatio n effect of honeycomb wave block under different seasonal changes,and proposed a parameter optimization design method suitable for honeycomb wave block of vibration barrier in cold regions.The study on the stability of the honeycomb wave block under freezing-thawing cycle showed the good stability of the honeycomb wave block and then the feasibility evaluation of the vibration isolation of the honeycomb wave block was be given.The results of this paper can provide some theoretical guidance for controlli ng the environmental vibration caused by high-speed railway in cold region of China.