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Dynamic Failure Potential of Partially Saturated Sand under Ultra-Low Confining Pressures
Sinusoidal equivalent loads are commonly used to simulate irregular seismic sources in the near surface, but the validity of this assumption is questionable especially for partially saturated soils that can be influenced by the increase in saturation from dynamically elevated pore pressures of soil beneath the near-surface zone. This research presents a laboratory investigation in which the variance in dynamic behavior of partially saturated near-surface sand with respect to liquefaction potential from impulse and cyclic loading was assessed. Twenty partially drained dynamic triaxial tests were performed at a confinement of 10 kPa using a poorly graded, medium-fine beach sand at a loose but stable fabric structure. The sand was purposely prepared and tested at 24% saturation, much lower that the observed liquefaction-like behavior saturation of 70%, to maximize the effect of suction increases in saturation such that the cause(s) of failure could be readily identified. The results indicate that matric suction does not influence the strength during loading due to fluid migration within the specimen and that treating seismic sources as equivalent sinusoidal loads can significantly underpredict induced strains.
Dynamic Failure Potential of Partially Saturated Sand under Ultra-Low Confining Pressures
Sinusoidal equivalent loads are commonly used to simulate irregular seismic sources in the near surface, but the validity of this assumption is questionable especially for partially saturated soils that can be influenced by the increase in saturation from dynamically elevated pore pressures of soil beneath the near-surface zone. This research presents a laboratory investigation in which the variance in dynamic behavior of partially saturated near-surface sand with respect to liquefaction potential from impulse and cyclic loading was assessed. Twenty partially drained dynamic triaxial tests were performed at a confinement of 10 kPa using a poorly graded, medium-fine beach sand at a loose but stable fabric structure. The sand was purposely prepared and tested at 24% saturation, much lower that the observed liquefaction-like behavior saturation of 70%, to maximize the effect of suction increases in saturation such that the cause(s) of failure could be readily identified. The results indicate that matric suction does not influence the strength during loading due to fluid migration within the specimen and that treating seismic sources as equivalent sinusoidal loads can significantly underpredict induced strains.
Dynamic Failure Potential of Partially Saturated Sand under Ultra-Low Confining Pressures
Taylor, Oliver-Denzil S. (author) / Winters, Katherine E. (author) / Berry, Woodman W. (author) / Zuzulock, Merissa L. (author)
Geotechnical Earthquake Engineering and Soil Dynamics V ; 2018 ; Austin, Texas
2018-06-07
Conference paper
Electronic Resource
English
Dynamic Failure Potential of Partially Saturated Sand under Ultra-Low Confining Pressures
| British Library Conference Proceedings | 2018