American Society of Civil Engineers


Seismic Compression Behavior of Sands with Fines of Low Plasticity


by Eric Yee, S.M.ASCE, (Research Associate, Department of Civil and Environmental Engineering, University of California, Los Angeles, USA E-mail: mailericyee@gmail.com), Jonathan P. Stewart, F.ASCE, (Professor, Department of Civil and Environmental Engineering, University of California, Los Angeles, USA), and Pendo M. Duku, M.ASCE, (Geotechnical Engineer, US Army Corps of Engineers, Kansas City, USA)
Section: Behavior and Modeling of Silty Soils, pp. 839-848, (doi:  http://dx.doi.org/10.1061/9780784412121.087)

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Document type: Conference Proceeding Paper
Part of: GeoCongress 2012: State of the Art and Practice in Geotechnical Engineering
Abstract: We investigate the seismic compression characteristics of non-plastic and low-plasticity silty sands with varying fines content (10 . FC . 60%). Simple shear testing was performed on various sand-fines mixtures at a range of modified Proctor relative compaction levels (RC) and degrees-of-saturation (S). Aside from the expected strong influence of RC, increasing fines content is found to generally decrease volume change for fines fractions consisting of silts and clayey silts with moderate to low plasticity. With truly non-plastic fines (rock flour), cyclic volume change increases with FC. Some materials also exhibit an effect of as-compacted saturation in which moderate saturation levels associated with high matric suction cause volume change to decrease. Additionally, the data consistently demonstrate that vertical strains decrease as overburden pressure is increased in a manner consistent with a previous clean sands model. A preliminary empirical model to capture these effects is presented.


ASCE Subject Headings:
Seismic effects
Sand (soil type)
Plasticity