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http://dx.doi.org/10.12814/jkgss.2018.17.3.009

A Fundamental Study on Evaluation of Corrected Compression Index by Plasticity Index in Marine Clayey Soils  

Park, Seong-Bak (N-Genius Co., Ltd.)
Lee, Kang-Il (Dept. of Civil Engineering, Daejin Univ.)
Seo, Se-Gwan (Zian Company ltd.)
Publication Information
Journal of the Korean Geosynthetics Society / v.17, no.3, 2018 , pp. 9-18 More about this Journal
Abstract
The soil parameters important for the design of the soft ground are the compression index ($C_c$), the consolidation settlement and consolidation speed at the field. Compression index is obtained by laboratory consolidation test. In the laboratory consolidation test, sample disturbance always occurs. In order to correct the disturbance phenomena, the method of calculating the compression index proposed by Schmertmann (1955) is generally used. However, recent developments in sampling technology and Korean soil conditions are different from those proposed by Schmertmann. So it needs to be verified. In this study, each consolidation curve's cross void ratio is evaluated by doing consolidation test varying disturbance on high-plastic clay (CH), low-plastic clay (CL) and low-plastic silt (ML). The test results were $0.521e_0$ for low-plastic silt, $0.404e_0$ for low-plastic clay, and $0.458e_0$ for the high-plastic clay. This results were different from those of Schmertmann's suggested value of $0.42e_0$. Therefor we proposed a correction formula using the plastic index according to soil type. However, since the results of this study are limited test results, further studies on various korean soil are needed to suggest the compression index correction method according to the degree of plasticity index of soil.
Keywords
Corrected compression index; Plasticity index; Oedometer test; Disturbed clay; Soil classification;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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