Abstract: Moving load is an important factor affecting the open-pit slope. The moving load dynamic test on Xinqiao Mine slope indicates that low frequency vibration takes a larger proportion in the whole frequency domain and the vibration low frequency mainly varies between 10 to 60Hz. The propagation velocity of train loading is below 0.01m/s on average and the propagation distance of the stress wave from moving load is generally between 5 to 20m. The high frequency component of vibration spectrum is absorbed instantly by rails, leaving small effect on both subgrade and slope; and the medium frequency component is transmitted from rails to subgrade, producing unstable excitation vibration to far-field subgrade and slope which will influence the structural stability of both subgrade and slope. In actual engineering, local reinforcement can prevent the sand soil from liquefaction in disturbed area.

Key words: Open-pit mine, Moving load, Testing