Field and numerical investigations on the environmental vibration and the influence of hill on vibration propagation induced by high-speed trains

Abstract

The environmental vibrations induced by high-speed trains have been taken as a real problem regarding to the safety of adjacent buildings and structures, safe operation of train, settlement and deformation of foundation and so on. It is vital to comprehensively figure out the laws of vibration propagation and the influence of the terrain conditions on vibration. To this end, an in-site vibration test was carried out to measure the vibrations of pier top, flat ground, and the hill induced by high-speed trains. The influences of train speed and the hill on vibration were studied in time- and frequency-domain in detail. And the train operation status was analyzed based on synchroextracting transform (SET). Moreover, a finite element model was established to investigate the influences of the hill location and hill shape on vibration propagation. The results indicate that the vibrations on the hill are significantly larger than those of the top of pier and the flat ground. The frequency components of the vibration are closely relative to the train speed and terrain condition. And the hill location and shape have obvious influence on vibration propagation. This research provides some practical and helpful recommendations for mitigation and control vibration.