In Situ Pore-Pressure Generation Behavior of Liquefiable Sand
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 133, Issue 8
Abstract
To overcome current limitations in predicting in situ pore-pressure generation, a new field testing technique is used to measure directly the coupled, local response between the induced shear strains and the generated excess pore pressure. The pore-pressure generation characteristics from two in situ liquefaction tests performed on field reconstituted specimens are presented, including the pore- pressure generation patterns at various strain levels, the observed stages of pore-pressure generation, and pore-pressure generation curves. Comparisons of the in situ pore-pressure generation curves with data in the literature and from laboratory strain-controlled, cyclic direct simple shear tests support the in situ testing results. In addition, the effects of effective confining stress on threshold shear strain and pore- pressure generation curves are discussed. Comparisons of the rate of pore-pressure generation among the in situ tests, laboratory strain-controlled tests, and a model based on stress-controlled tests reveal that in situ pore pressures generated in reconstituted soil specimens during dynamic loading develop more similarly to those from cyclic strain-controlled laboratory testing. This observation implies that the evaluation of induced strains rather than induced shear stresses may be more appropriate for the simulation of pore-pressure generation.
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Acknowledgments
Financial support was provided by the National Science Foundation under CAREER Award No. NSFCMS-9875430 and Grant No. NSFCMS-9973717. This support is gratefully acknowledged. Any opinions, findings and conclusions or recommendations expressed in this material are those of the writers and do not necessarily reflect the views of the National Science Foundation.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 133 • Issue 8 • August 2007
Pages: 921 - 931
Copyright
© 2007 ASCE.
History
Received: Dec 28, 2005
Accepted: Jul 28, 2006
Published online: Aug 1, 2007
Published in print: Aug 2007
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