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Seismic Compression Behavior of Sands with Fines of Low Plasticity
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.
Seismic Compression Behavior of Sands with Fines of Low Plasticity
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.
Seismic Compression Behavior of Sands with Fines of Low Plasticity
Yee, Eric (author) / Stewart, Jonathan P. (author) / Duku, Pendo M. (author)
GeoCongress 2012 ; 2012 ; Oakland, California, United States
GeoCongress 2012 ; 839-848
2012-03-29
Conference paper
Electronic Resource
English
Seismic Compression Behavior of Sands with Fines of Low Plasticity
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