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Centrifuge tests to assess seismic site response of partially saturated sand layers
AbstractSeismic response of unsaturated soil layers may differ from that of saturated or dry soil deposits. A set of centrifuge experiments was conducted to study the influence of partial saturation on seismic response of sand layers under scaled Northridge earthquake motion. Steady state infiltration was implemented to control and provide uniform degree of saturation profiles in depth. The amplification of peak ground acceleration at the soil surface was inversely proportional to the degree of saturation, especially in low period range. The cumulative intensity amplification of the motion was also higher in unsaturated soils with higher suctions. The lateral deformation and surface settlement of partially saturated sand with higher stiffness were generally lower than that in dry soil. Although neglecting the effect of partial saturation in sand layers might be conservative with respect to seismic deformations, it may result in underestimating the surface design spectra.
HighlightsSteady state infiltration was implemented to control the degree of saturation.Site response was evaluated for sand layers with various degrees of saturation.Intensity amplification was higher in unsaturated sand layers.Surface settlement and lateral deformation were lower in unsaturated sand layers.
Centrifuge tests to assess seismic site response of partially saturated sand layers
AbstractSeismic response of unsaturated soil layers may differ from that of saturated or dry soil deposits. A set of centrifuge experiments was conducted to study the influence of partial saturation on seismic response of sand layers under scaled Northridge earthquake motion. Steady state infiltration was implemented to control and provide uniform degree of saturation profiles in depth. The amplification of peak ground acceleration at the soil surface was inversely proportional to the degree of saturation, especially in low period range. The cumulative intensity amplification of the motion was also higher in unsaturated soils with higher suctions. The lateral deformation and surface settlement of partially saturated sand with higher stiffness were generally lower than that in dry soil. Although neglecting the effect of partial saturation in sand layers might be conservative with respect to seismic deformations, it may result in underestimating the surface design spectra.
HighlightsSteady state infiltration was implemented to control the degree of saturation.Site response was evaluated for sand layers with various degrees of saturation.Intensity amplification was higher in unsaturated sand layers.Surface settlement and lateral deformation were lower in unsaturated sand layers.
Centrifuge tests to assess seismic site response of partially saturated sand layers
Mirshekari, Morteza (author) / Ghayoomi, Majid (author)
Soil Dynamics and Earthquake Engineering ; 94 ; 254-265
2017-01-11
12 pages
Article (Journal)
Electronic Resource
English
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