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    Volume 40, Issue 1 (January 2017)

    Application of Film-Like Sensors for K0 and Pore Water Pressure Measurement in Clay During 1D Consolidation

    (Received 13 January 2016; accepted 21 July 2016)

    Published Online: 09 January 2017

    CODEN: GTJODJ

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    Abstract

    In this study, the economical FlexiForce sensor, which is thin and flexible, was used to measure K0 and the excess pore water pressure during a 1D consolidation test on kaolinite clay samples. Before the sensor could be used in the measurement, a special waterproof coating was applied, after which sensor calibration was carried out. The coated FlexiForce sensor was incorporated into two types of tailor-made needle probes for the pore water pressure measurement. The experimental results demonstrate that the two types of needle probes can well capture the evolution of the induced excess pore water pressure during consolidation. Upon a loading increment, the measured excess pore water pressure at the middle of the sample continues to increase and reaches a maximum value at t = ∼4 min and subsequently start to decrease. There is a distinct change in the decreasing trend of the measured excess pore water pressure; the trend becomes mild after t = ∼480 min, indicating the end of primary consolidation. During secondary compression, the excess pore water pressure continues to decrease due to the continuous settlement. A constant K0 value, which is comparable to the prediction by Jaky's equation, is measured by the sensors in the loading path; during secondary compression, K0 increases with time.


    Author Information:

    Gao, Y.
    School of Earth Science and Geological Engineering, Sun Yat-sen University, Guang Zhou,

    Wang, Y. -H.
    Dept. of Civil and Environmental Engineering, The Hong Kong Univ. of Science and Technology, HKSAR,

    Chow, J. K.
    Dept. of Civil and Environmental Engineering, The Hong Kong Univ. of Science and Technology, HKSAR,


    Stock #: GTJ20160008

    ISSN:0149-6115

    DOI: 10.1520/GTJ20160008

    Author
    Title Application of Film-Like Sensors for K0 and Pore Water Pressure Measurement in Clay During 1D Consolidation
    Symposium ,
    Committee D18