Dynamics and experimental study on prefabricated damping pad floating slab track
Due to process limitation,the laying accuracy of the traditional subway track bed is low,and the construction speed is slow,while the construction accuracy and efficiency of the prefabricated track bed are relatively high.In addition,many subway lines often require the addition of vibration reduction measures or an upgrade in the vibration reduction levels after a period of operation.Therefore,it is urgent to develop the prefabricated damping pad floating slab track(PDPFST)with various vibration reduction grades and convenient upgrade options for vibration reduction.Therefore,the PDPFST was developed and applied to three new metro lines in Qingdao.In this paper,the coupled simulation analysis and field tests were conducted on the dynamic performance and vibration reduction performance of the vehicle passing through the PDPFST.Firstly,the structure and construction technology of the PDPFST were introduced.Then,the requirements and evaluation methods for the simulation and test of dynamic performance analysis and vibration reduction effect analysis were presented.Then,a vehicle-floating slab track-tunnel coupled dynamic analysis model was established.Finally,the coupled simulation results were compared with the field test results.Through the above research,the following conclusions are drawn:Compared to the traditional track slabs,the construction progress of the PDPFST is increased by 3 times(approximately 110 meters per day).The simulation results of the dynamic performance and vibration reduction performance of the vehicle passing through the PDPFST are in good agreement with the measured values,and the dynamic performance of the vehicle meets the requirements.When the vibration frequency is greater than (√2) times the natural frequency,the floating slab track can exhibit a good vibration reduction effect.The vibration reduction effect of the PDPFST is remarkable.The high vibration reduction effect is approximately 13 dB and the medium vibration reduction effect is approximately 8 dB.The research results can provide a certain theoretical and practical reference for the design and implementation of the PDPFST.
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