## 3 Analysis of Slope Model Test Results
### The Law of Change of Horizontal Displacement of Slope Surface  
As shown in Figure 9, under the effect of crest loading at 2 Hz, the maximum horizontal displacement of the slope surface varied at different points. At points C1 and C2, the maximum horizontal displacement decreased. Particularly, at point C1, the reduction was at its most significant, decreasing from an outward protrusion of 1.3 mm to 0.1 mm, marking a reduction of nearly 92%. At point C3, the maximum horizontal displacement of the slope surface slightly increased, from a slight inward depression to 0.1 mm. However, at points C4 and C5, there was only a minimal change in the maximum horizontal displacement of the slope surface. As depicted in Figure 10, under the effect of crest loading at 3 Hz, the maximum horizontal displacement of the slope surface exhibited varying trends at different measurement points. At points C1 and C2, the maximum horizontal displacement of the slope surface decreased. Specifically, at these points, the displacement reduced from the outward protrusion of 0.4 mm and 0.1 mm to 0.2 mm and 0.05 mm, respectively, marking a reduction of nearly 50% at both locations. Conversely, at points C3 and C4, the maximum horizontal displacement of the slope surface increased. At these points, the displacement shifted from  
Figure 8: Maximum vertical ground pressure with different peak differences. Figure 9: Maximum horizontal displacement of slope surface at 2 Hz loading frequency. an inward depression of 0.05 mm and 0.02 mm to 0.2 mm. However, at point C5, there was no significant change in the maximum horizontal displacement of the slope surface. As shown in Figure 11, under the effect of crest loading at 4 Hz, the maximum horizontal displacement of the slope surface exhibited varying trends at different measurement points. At point C1, the maximum horizontal displacement of the slope surface decreased significantly from an outward protrusion of 1.3 mm to 0.25 mm. At point C2, the maximum horizontal displacement decreased from an outward protrusion of 0.35 mm to an inward depression of 0.15 mm. Conversely, at point C3, the maximum horizontal displacement increased from an inward depression of 0.05 mm to 0.15 mm. However, at points C4 and C5, there were no significant changes in the maximum horizontal displacement of the slope surface. As shown in Figure 12, with the increase in the peak-to-peak crest loading, the maximum surface displacement at various measurement points demonstrated different trends. At point C1, the maximum surface displacement slightly increased and then remained relatively stable. At point C2, the maximum surface displacement decreased from an inward depression of 0.1 mm to 0 mm. Meanwhile, at point C3, the maximum surface displacement increased from 0.15 mm to 0.2 mm. At point C4, the maximum surface displacement slightly increased before  
Figure 11: Maximum horizontal displacement of slope surface with loading frequency 4 Hz. Figure 10: Maximum horizontal displacement of slope surface with loading frequency 3 Hz. stabilizing. Additionally, at point C5, the maximum surface displacement initially remained unchanged and then slightly increased to an outward protrusion of 0.15 mm. As depicted in Figure 13, with the increase in the peak value differential of the crest loading, the maximum surface displacement at various measurement points showed distinct changes. At point C1, the maximum surface displacement decreased from an outward protrusion of 0.23 mm to 0.18 mm. At point C2, the maximum surface displacement increased from an inward depression of 0.2 mm to 0.7 mm. However, at points C3, C4, and C5, the maximum surface displacement remained relatively unchanged and maintained a consistent pattern. Under crest loading, the slope surface exhibits outward protrusion at the slope crest and slope toe regions, while it shows inward depression in the middle section of the slope.