Abstract：Based on the loess slope of Pingliang District, the comparative shaking table model test of fissured loess slope and non-fissured loess slope is carried out to study the displacement and acceleration response of loess slope under seismic loading. Through the 3D optical measurement and analysis system, the deformation of the slope surface is obtained with high precision and real time. The experimental results show that with the increase of the input seismic load, the PGD of the fissured loess slope surface and the non-fissured loess slope surface show a trend of increasing with the increase of the slope height; under the same seismic wave input, the horizontal loading effect the peak displacement of the slope surface is slightly larger than the peak displacement of the slope surface under the vertical loading, and the displacement at shoulder of the fissured slope is about 1.5 times that of the non-fissured slope. By comparing the PGA amplification factors at different elevations of the slope, it is shown that the acceleration amplification effect of the horizontal slope of the two types of slopes is greater than the vertical direction, and the maximum value is obtained at the shoulders, showing the elevation effect and the surface effect; the amplification coefficient of PGA at the shoulder of fissured slope is obviously larger than that of non-fissured slope.
