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http://dx.doi.org/10.12814/jkgss.2017.16.1.073

Evaluation of CPTU Cone Factor of Silty Soil with Low Plasticity Focusing on Undrained Shear Strength Characteristics  

Kim, Ju-Hyun (Department of Civil Engineering, Dongshin University)
Publication Information
Journal of the Korean Geosynthetics Society / v.16, no.1, 2017 , pp. 73-83 More about this Journal
Abstract
Laboratory and in-situ tests were conducted to evaluate the cone factors for the layers with low plasticity containing a lot of silty and sand soils from the west coast (Incheon, Hwaseong and Gunsan areas) and its applicability was evaluated based on these results. The cone factors were evaluated from 19 to 23 based on unconfined compression strengths (qu), from 13 to 13.8 based on simple CU strengths and from 11.6 to 13.1 based on field vane strengths, respectively. The unconfined compression strengths of undisturbed silty soil samples with low plasticity were considerably underestimated due to the change of in-situ residual effective stress during sampling. Half of unconfined compression strength (qu/2) based cone factors of silty soils with low plasticity fluctuated and were approximately 1.8 times higher than simple CU based values of these soils. When evaluating cone factors of these soils, it should be judged overall on the physical properties such as the grain size distribution and soil plasticity and on the fluctuation of the corrected cone resistance and the sleeve friction due to the distribution of sandseam in the ground including pore pressure parameter.
Keywords
Silty soil; Low plasticity; CPTU data; Cone factor; Unconfined compression test; Simple CU test;
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Times Cited By KSCI : 4  (Citation Analysis)
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