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Undrained Behavior of Silty Glacial Sand
The instability due to rapid generation of pore water pressure in loose to medium dense soil is one of the major causes of catastrophic failure of geotechnical structures. Most of the previous studies on instability-liquefaction behavior have focused on clean sands, although sands with a significant amount of fines (particle size < 0.075 mm) are common in field conditions. Some recent studies on artificially mixed sands with silts have shown that these soils are much more liquefiable than clean sand. Thus, this study investigated the instability behavior of naturally occurring silty sand. The effect of in-place void ratios and the initial mean effective stresses on the mechanical behavior of the silty sand was investigated. It was observed that for the same in-place void ratio, the liquefaction resistance increased with initial mean effective stress, which is consistent with the so called "reversed behavior." The instability stress ratio and relative density showed a single correlation, which can be used to predict the triggering of instability. Further, the flow behavior could be described with respect to phase transformation points, at which the effective stress path changes soil behavior from compressive to dilative displacement.
Undrained Behavior of Silty Glacial Sand
The instability due to rapid generation of pore water pressure in loose to medium dense soil is one of the major causes of catastrophic failure of geotechnical structures. Most of the previous studies on instability-liquefaction behavior have focused on clean sands, although sands with a significant amount of fines (particle size < 0.075 mm) are common in field conditions. Some recent studies on artificially mixed sands with silts have shown that these soils are much more liquefiable than clean sand. Thus, this study investigated the instability behavior of naturally occurring silty sand. The effect of in-place void ratios and the initial mean effective stresses on the mechanical behavior of the silty sand was investigated. It was observed that for the same in-place void ratio, the liquefaction resistance increased with initial mean effective stress, which is consistent with the so called "reversed behavior." The instability stress ratio and relative density showed a single correlation, which can be used to predict the triggering of instability. Further, the flow behavior could be described with respect to phase transformation points, at which the effective stress path changes soil behavior from compressive to dilative displacement.
Undrained Behavior of Silty Glacial Sand
Rabbi, A. T. M. Z. (author) / Rahman, M. M. (author) / Cameron, D. A. (author)
Geo-Congress 2014 ; 2014 ; Atlanta, Georgia
Geo-Congress 2014 Technical Papers ; 139-148
2014-02-24
Conference paper
Electronic Resource
English
Undrained Behaviour of Silty Glacial Sand
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