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Seismic Stability of a Sloping Sediment Cap
An existing submarine slope comprised of native estuarine soils and contaminated dredged fill was being evaluated for capping when a Magnitude 6.8 Nisqually Earthquake occurred, resulting in liquefaction of the adjacent onshore areas where a peak ground acceleration of 0.22g was measured. A post-earthquake bathymetric study of the offshore slope revealed that although previous landslides had occurred on the slopes, there was no detectable change since the last bathymetric study in 1996. The ensuing subsurface explorations encountered mixed silt and sand that by most measures would be considered liquefiable and prone to sliding. To reconcile the observed favorable behavior of the slope with the theoretical unfavorable performance during seismic shaking, assumptions were made regarding the likely damping and reduction of ground motion at the slope location as well as the preference of cone probe data to boring data and the influence of fines content on the liquefaction resistance of sand-silt mixtures.
Seismic Stability of a Sloping Sediment Cap
An existing submarine slope comprised of native estuarine soils and contaminated dredged fill was being evaluated for capping when a Magnitude 6.8 Nisqually Earthquake occurred, resulting in liquefaction of the adjacent onshore areas where a peak ground acceleration of 0.22g was measured. A post-earthquake bathymetric study of the offshore slope revealed that although previous landslides had occurred on the slopes, there was no detectable change since the last bathymetric study in 1996. The ensuing subsurface explorations encountered mixed silt and sand that by most measures would be considered liquefiable and prone to sliding. To reconcile the observed favorable behavior of the slope with the theoretical unfavorable performance during seismic shaking, assumptions were made regarding the likely damping and reduction of ground motion at the slope location as well as the preference of cone probe data to boring data and the influence of fines content on the liquefaction resistance of sand-silt mixtures.
Seismic Stability of a Sloping Sediment Cap
McCabe, W. Martin (author)
Ports Conference 2004 ; 2004 ; Houston, Texas, United States
Ports 2004 ; 1-10
2004-05-13
Conference paper
Electronic Resource
English
Earthquakes , Fills , Harbors , Slopes , Washington , Sediment , Waterfront structures , Harbor facilities , Dredging
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