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Characteristics of Undrained Static Shear Behavior for Sand Due to Aging Effect  

김영수 (경북대학교 토목공학과)
김대만 (경북대학교 토목공학과)
Publication Information
Journal of the Korean Geotechnical Society / v.20, no.6, 2004 , pp. 137-150 More about this Journal
Abstract
Aging effect of sands showed insignificant result in comparison with that of clay, so that it has not been studied so far. But, as penetration resistance increase has been observed with the lapse of time after deposition and disturbance, aging effect of sands has been actively investigated by field tests, and recently many researchers are performing not oかy field tests but also laboratory tests on sands, so aging effects of sands have been also examined by laboratory tests. In this study, to observe the aging effect of undrained static shear behavior for Nak-Dong River sand, undrained static triaxial tests were performed with changing relative density$(D_r)$, consolidation stress ratio$(K_c)$, and consolidation time. These tests showed that modulus within elastic section increased as consolidation time increased, and in addition, phase transformation point strength$(S_{PT})$ and critical stress ratio point strength $(S_{CSR})$ also increased. But pore water pressure ratio$(u/{p_c} decreased as consolidation time increased, so with this various result, aging effect of static shear for sands can be observed as well.
Keywords
Aging effect; Critical stress ratio; Elastic modulus; Failure line; Phase transformation line;
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