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http://dx.doi.org/10.12814/jkgss.2017.16.3.031

Evaluation of Strength Incremental Ratio of Korean Marine Clayey Soil  

Kim, Ju-Hyun (Department of Civil Engineering, Dongshin University)
Publication Information
Journal of the Korean Geosynthetics Society / v.16, no.3, 2017 , pp. 31-39 More about this Journal
Abstract
Applicability of Skempton's and Hansbo's equation for estimating strength incremental ratio of Korean marine clayey soil was analyzed. These empirical equations have been commonly applied to design soft ground improvement by, especially, staged loading method. Strength incremental ratios proposed by Skempton (1954, 1957) and Hansbo (1957) using field vane tests(FVTs), measured in Scandinavia depends on plasticity index and liquid limit. Although lean clay in Scandinavia can be classified as clay based on USCS, this soil contains no clay mineral because it was produced by the glacial grinding of rock, sometimes, called rock flour. On the contrary, plasticity indices of Korean marine clayey soils increase linearly with the percentage of clay fraction (% finer than $2{\mu}m$ by weight). Except for strength incremental ratios using $q_u/2$ values in the case of soils having a low plasticity, such as Incheon, Hwaseong and Gunsan soils, these values are in the range of 0.25 to 0.35, independently of the plasticity index, $I_p$.
Keywords
Strength incremental ratio; Plasticity index; Liquid limit; Low plasticity soil;
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Times Cited By KSCI : 3  (Citation Analysis)
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