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    Volume 39, Issue 2 (March 2016)

    Ultrasonic P-Wave Reflection Monitoring of Soil Erosion for Erosion Function Apparatus

    (Received 22 February 2015; accepted 12 November 2015)

    Published Online: 2016

    CODEN: GTJOAD

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    Abstract

    Erosion of soils in river, lake, and seabeds is an important component for scour estimation and design of underwater structures. This is because the scour can cause severe structural damage to underwater foundations or embankments. The erosion function apparatus (EFA) method is widely used to estimate the erosion rate of soils in the laboratory, where a soil protrusion of 1 mm thick is exposed to water flow and the time taken to erode this protrusion is measured. However, determining this erosion time is a difficult task because it is only visually inspected, and this can cause considerable measurement errors. Therefore, this study explored the feasibility of using an ultrasonic P-wave reflection monitoring method to more quantitatively assess the erosion rate that otherwise has been measured by visual inspection. The erosion rates were monitored using ultrasonic transducers mounted above a soil surface during the EFA testing on the prepared soil samples containing different clay fractions. Via the P-wave monitoring results, several important semi-quantitative observations were made: an increase in erosion resistance with an increase in the clay fraction, a discontinuous erosion behavior of fine-grained soils with sudden removal of soil lumps by water flows, a continuous erosive action of coarse-grained soils, and inherent heterogeneous erosion even at a specimen scale (i.e., the scale of milli-to-centimeter). While both the P-wave monitoring method and the visual inspection showed similar estimation on the erosion rate, the former was found to provide overall better quantitative assessment, particularly in conditions of very slow or rapid erosion and in the conditions with high turbidity water, unevenly eroded sample surfaces, or limited control on the soil protruding thickness.


    Author Information:

    Ham, Soo-Min
    Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon,

    Kwon, Tae-Hyuk
    Assistant Professor, Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and,

    Chang, Ilhan
    Senior Researcher, Geotechnical Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology (KICT), Goyang City,

    Chung, Moon-Kyung
    Senior Research Fellow, Geotechnical Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology (KICT), Goyang City,


    Stock #: GTJ20150040

    ISSN: 0149-6115

    DOI: 10.1520/GTJ20150040

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    Author
    Title Ultrasonic P-Wave Reflection Monitoring of Soil Erosion for Erosion Function Apparatus
    Symposium , 0000-00-00
    Committee D18