Seismic Design of Slopes I - Indian Institute of Technology ...
Seismic Design of Slopes I - Indian Institute of Technology ...
Seismic Design of Slopes I - Indian Institute of Technology ...
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Factor <strong>of</strong> Safety and <strong>Seismic</strong> Coefficient<br />
• Complex ground shaking replaced by a single<br />
constant unidirectional pseudo-static acceleration<br />
• Can we consider peak seismic acceleration with<br />
FOS=1? (No deformation…)<br />
• Too conservative<br />
• We can allow some deformation, what should be the seismic<br />
coefficient.<br />
• For sure, some deformation is acceptable….<br />
• A value lower than peak seismic acceleration can be used to<br />
compute seismic coefficient<br />
• FOS can be taken in the range <strong>of</strong> 1.0 - 1.1<br />
• Is there any other factor to consider?<br />
19<br />
Waves travelling through Slope<br />
Kramer, 1996<br />
• Long wavelengths (Low frequency) cause the<br />
unstable zone to move in-phase along the full height.<br />
• Fort short wavelengths (higher frequency) the soil at<br />
two different locations in unstable zone may move in<br />
opposite directions<br />
20<br />
10
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