Volumetric Strains of Clean Sands Subject to Cyclic Loads
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 134, Issue 8
Abstract
We utilize simple shear testing to investigate the volume change of clean sands subject to cyclic loads. We examine the effects of a number of compositional and environmental factors on the vertical strain at 15 uniform shear strain cycles and on the cycle-to-cycle variation of vertical strain. The compositional factor found to principally affect seismic compression susceptibility is relative density. Compositional factors found to not significantly affect cyclic volume change include gradation parameters (mean grain size and uniformity coefficient), particle angularity, soil fabric, mineralogy, and void ratio “breadth” . An environmental factor found to affect seismic compression susceptibility is confining stress, with volumetric strains decreasing with increasing stress. Environmental factors that do not significantly affect seismic compression susceptibility for clean sands are saturation and age. Stress history can decrease vertical strains from seismic compression for certain conditions, but we find such effects to be insignificant for the levels of overburden stress where compacted fills are typically overconsolidated from compaction-induced stresses. An empirical model is developed to represent the major trends of the data for application in engineering practice, which improves upon an earlier model that is based on a much smaller database and does not account for the aforementioned environmental factors.
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Acknowledgments
Partial support for this research was provided by the U.S. Geological Survey (USGS), Department of the Interior, under USGS Award No. 05HQGR0050. Additional support was provided by Subcontract No. 10 between the Consortium of Universities for Research in Earthquake Engineering (CUREE) and the Regents of the University of California, with funding provided by the California Earthquake Authority (CEA). This support is gratefully acknowledged. The views and conclusions contained in this document are those of the writers and should not be interpreted as necessarily representing the official policies, either expressed or implied, of the U.S. Government, CUREE, or the CEA. We acknowledge the significant contributions of Matthew Moyneur to this work, who performed many of the preliminary tests on clean sand materials. We would also like to thank Mladen Vucetic of UCLA for his valuable insights in helping to interpret the test results.
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© 2008 ASCE.
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Received: Feb 17, 2007
Accepted: Oct 24, 2007
Published online: Aug 1, 2008
Published in print: Aug 2008
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