Browsing by Author "Oda, M"

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    Characterization of geotechnical properties as affected by sediment environment in Kanto lowland clays in Japan
    (2013-11-11) Tsuboi, H; Yanase, Y; Hamamoto, S; Kawamoto, K; Takemura, T; Oda, M
    The purpose of this study is to investigate effects of sedimentary environment (freshwater and marine deposits) on geotechnical properties for Kanto lowland clays. Freshwater and marine sediments were used to perform standard consolidation tests, undrained triaxial compression tests, and unconfined compression test. Pore-water compositions were also measured for the sediments. As results, higher compression index, higher sensitivity, and lower shear strength ratio were observed for the marine sediments as compared to those for the freshwater sediments. In addition, the measurements of pore-water compositions revealed that the sensitivity values were well related to the proportion of monovalent cations, especially for the sediments with plastic index of less than 30.
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    Consolidation characracteristics for Sri Lankan and Japanese clays: void index in relation to stress states and sedimentation environment
    (2013-11-19) Yanase, Y; Tsuboi, H; Hamamoto, S; Kawamoto, K; Takemura, T; Kurukulasuriya, LC; Oda, M
    It is well known that cementation/aging and sedimentation environment affect significantly a compressibility of natural clays. In this study, one-dimensional consolidation curves (e-log p) have been measured using a standard oedometer test for several Sri Lankan and Japanese clays with different sedimentation environment (i.e., freshwater and marine sediments). The void index proposed by Burland (1990) was used to analyze the measured cosnsolidation curves. As a result, void index of marine sediments is higher than that of freshwater sediments and drastically decrease after consolidation yield stress. On the other hand, void index of Sri Lankan clays is quite low and gently narrow as increase consolidation stress. That indicates the Burland’s void index well characterized the effects of sedimentation enviroments on the consolidation characteristics of clays.