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http://dx.doi.org/10.7843/kgs.2008.24.2.77

Development and Application of Ultra Small Micro-Cone Penetrometer  

Lee, Jong-Sub (Dept. of Civil, Environmental and Architectural Engrg., Korea Univ.)
Shin, Dong-Hyun (Dept. of Civil, Environmental and Architectural Engrg., Korea Univ.)
Yoon, Hyung-Koo (Dept. of Civil, Environmental and Architectural Engrg., Korea Univ.)
Lee, Woo-Jin (Dept. of Civil, Environmental and Architectural Engrg., Korea Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.24, no.2, 2008 , pp. 77-86 More about this Journal
Abstract
The disturbance zone and measured values are affected by the size of the penetrometer. The local value may be measured by the smaller penetrometer. An ultra small Micro-Cone penetrometer (5mm in outer diameter) is designed and manufactured to characterize soil properties with minimum disturbance during penetration tests. The tip resistance is measured by using stain gauges attached near the Micro-Cone. In addition, the friction sleeve is adopted to effectively remove the skin friction from the tip resistance. Design concern includes the installation of stain gauges, circuits, penetration systems, penetration rate, sampling rate, operating temperature, and calibration. Application tests show that the clay interface, and the soil layers consisting of clay and sand are clearly detected by the Micro-Cone. Furthermore, the cone tip resistances measured by the Micro-Cone and the miniature cone (16mm in outer diameter) are similar. Note the resolution is much higher in the Micro-Cone. This study shows that the Micro-Cone may effectively detect the soil interface with high resolution, and with minimum disturbance.
Keywords
Calibration Chamber; Cone tip resistance; Interface detection; Layer detection; Liquefaction; Miniature cone;
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