Abstract: Based on the Abaqus software 64 CPU parallel computing cluster platform, a three-dimensional finite element model of train-track-viaduct-foundation-soil coupling is established. Ground surface vibration characters caused by trains running under different conditions are obtained; and the law about that ground surface vibration level decreases with the increased distance between the ground surface and the viaduct pier is parametrically analyzed. Then the main conclusions are drawn as follows. With the increased train speed, ground surface vibration level increases obviously. The fully loaded train capacity only slightly increases ground surface vibration level of the site near pier, having little effect on the site away from pier. The number of carriages has no obvious effect on ground surface vibration level. Ground surface vibration level under train running in double line is much greater than it under train running in single line. The increase of fastener stiffness could slightly decrease ground surface vibration level. With the increase of pile length, ground surface vibration level decreases much. The increase of pier span could decrease ground surface vibration level, however, when pier span increases to a certain value, there isn’t apparent effect on vibration reduction. Pier height has no apparent effect on ground surface vibration level. The ground surface vibration level tends to gradually decrease with the increase of shear wave velocity of soil.

Key words: elevated rail transit, ground surface vibration level, parameterized analysis