Study on Vibration Damping Performance of Underground Railway Track with Rubber Vibration-Damping Pad

In order to ascertain the vibration damping effect of underground railway track with rubber vibration-damping pad,a three-dimensional finite element and infinite element coupling model of vehicle-track-tunnel-soil-building system was established,and the vibration levels of the three-direction vibration accelerations of the building along the underground railway were calculated respectively under the two working conditions;the track which came with ordinary monolithic track bed and the track which came with rubber vibration-damping pad.The results show that:(a) Among the building vibrations caused by train running,the transverse vibration perpendicular to the track direction is the dominant one,followed by the vertical vibration,while the longitudinal vibration parallel to the track direction is the smallest.(b) When using the track with rubber vibration-damping pad,the vibration levels of the transverse and longitudinal accelerations of the column nodes of the building will considerably decrease;and the decreasing will be almost the same with the increasing of the height to the ground surface and will be about 8.9dB.(c)The building floor slabs' vertical vibration patterns which are obtained respectively by using the track with ordinary monolithic track bed and by using the track with rubber vibrationdamping pad,are basically the same;namely,the building floor slab's vertical vibrations will present a trend of decreasing at first and then increasing as the building storey increases,but the difference will be very small.(d) Compared with the track which comes with ordinary monolithic track bed,the tack which comes with rubber-damping pad can decrease the vibration level of vertical acceleration of the floor slab by about 9 dB.