Seismic Acceleration Spectrum of Ground Surface under Urban Subway Tunnels with Circular Cross Sections in Soil Deposits Based on SSI

Figure 13

The ratio of SF/FF (for average of spectral accelerations) for models 10–14 of Table 2 at distances of zero, 5.83, 10.50, 15.17, 26.83, 38.5, 51.33, and 61.83 meters from the center of the tunnel projection onto the ground surface and their comparison.