Postcyclic Recompression, Stiffness, and Consolidated Cyclic Strength of Silt
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 133, Issue 4
Abstract
Low plasticity silts are liquefiable and the dissipation of pore pressures after an earthquake will be accompanied by densification and compression of the soil skeleton. Anisotropic rather than isotropic stress distributions are commonly found to exist in slopes or silty fills placed under conditions and this can be enhanced further by the weight of overlying structures. Compression after an earthquake generally increases soil resistance but it can still be liquefied by aftershocks. The postcyclic recompression of silt, and postdrainage monotonic and cyclic strength and stiffness have therefore been investigated with respect to the effect of initial anisotropic consolidation. The compressibilities during postcyclic recompression were similar to those for isotropic consolidation. Samples with a greater initial anisotropy had less volumetric strain but larger axial strains during postcyclic drainage. Under stress reversal conditions failure occurred as a result of the development of double amplitude cyclic strains, whereas under nonreversal conditions compressive axial plastic strain was accumulated. Postdrainage second loading cyclic strength increased with increasing anisotropy. For isotropically consolidated samples failure under reversal cyclic loading resulted in a weaker soil structure even after postcyclic reconsolidation.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 133 • Issue 4 • April 2007
Pages: 416 - 423
Copyright
© 2007 ASCE.
History
Received: Jan 19, 2005
Accepted: Sep 29, 2006
Published online: Apr 1, 2007
Published in print: Apr 2007
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