Seismic Shear Deformation of Compliant Fine-Grained Soil

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Ground shear displacement plot. Click on figure for enlargement. (32K)

UNDERSTANDING A GROUND SHEAR DISPLACEMENT PLOT: Trajectories for displacement of rigid ground (blue) and compliant (red) ground are plotted above for a 2° slope subjected to the Newhall record. The maximum displacement occurs upslope to the north (~18cm). Downslope ratcheting of the ground ultimately drives the final displacements in the opposite direction (6 and 15 cm). The trajectories map the position of the ground during earthquake shaking. (Note: The modeled flexible displaced ground is 15m tall with Vs= 100m/s, Tground = 1.26 s.). Below is a similar ground displacement plot.

Seismic shear displacement Vs>>1000 m/s Seismic shear displacement Vs=480 m/s
Seismic shear displacement Vs=278 m/s Seismic shear displacement Vs=250 m/s
Seismic shear displacement Vs=160 m/s Seismic shear displacement Vs=105 m/s.
Seismic shear displacement Vs=70 m/s Slope spectra - ground period/motion period.
Click on figure for enlargement. (44K)

contact: Robert Kayen
last modified 2018