Volume 32, Issue 4 (July 2009)

    Micro-Cone Penetrometer for More Concise Subsurface Layer Detection

    (Received 20 February 2008; accepted 24 January 2009)

    Published Online: 2009

    CODEN: GTJOAD

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    Abstract

    As the disturbance zone and measurement of soil properties are affected by the size of the penetrometer, a more local value may be measured by a smaller penetrometer. An ultra small Micro-Cone penetrometer with a 5 mm outer diameter is designed and manufactured to characterize soil properties with minimum disturbance during penetration tests. The tip resistance is measured by using strain gages attached near the Micro-Cone (MC) tip. A friction sleeve is adopted to effectively remove the skin friction from the tip resistance. Design concerns include the installation of strain gages, circuits, operating temperature, input voltage, penetration systems, penetration rate, sampling rate, and calibration. Application tests show that the air-clay interface, and the soil layers that consist of clay and sand are closely detected by the MC penetrometer. The cone tip resistances measured by the MC and the miniature cone with a 16 mm outer diameter are similar in clay. The strength change in sand after multiple liquefactions is clearly identified. This study shows that, with a relatively high resolution, the MC penetrometer may effectively detect the soil interface and yield the reasonable cone tip resistance.


    Author Information:

    Lee, Woojin
    Associate Professor, School of Civil, Environmental and Architectural Engineering, Korea University, Seoul

    Shin, Dong-Hyun
    Researcher, Research & Development Institute, Lotte E&C Co. Ltd., Seoul

    Yoon, Hyung-Koo
    Ph.D. Student, School of Civil, Environmental and Architectural Engineering, Korea University, Seoul

    Lee, Jong-Sub
    Associate Professor, School of Civil, Environmental and Architectural Engineering, Korea University, Seoul


    Stock #: GTJ101712

    ISSN: 0149-6115

    DOI: 10.1520/GTJ101712

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    Author
    Title Micro-Cone Penetrometer for More Concise Subsurface Layer Detection
    Symposium , 0000-00-00
    Committee D18