Study on Seismic Spectrum and Amplification Effect of Soft Soil in Tianjin New Coastal Area

Tianjin new coastal area has a large of soft soil with high salinity and humidity. This kind foundation unique spectral characteristics amplification effect on ground motion, which is deep factor to increase earthquake damage. Based the geotechnical data coastal, we established simplified calculation model adopted nonlinear method study seismic spectrum three typical different thickness in area, real motion EL-Centro wave passing through, that order provide basis for design engineering structures this area. The results show that: an obvious within 8HZ, while greater than 8HZ rapidly attenuates after filtering through soil, amplitude greatly reduced. After passes types acceleration, velocity displacement coefficient are always state amplification. largest muddy followed by clay smallest silty clay. softer more will be. Except does not change much thickness, acceleration coefficients gradually reaching surface.