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    Airborne acoustic method to determine the volumetric water content of unsaturated sands

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    Publication date
    2009
    Author
    Mohamed, Mostafa H.A.
    Horoshenkov, Kirill V.
    Keyword
    REF 2014; Water content; Acoustic techniques; Measurement; Unsaturated soils; Porosity
    
    Metadata
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    Abstract
    This paper presents an innovative experimental approach for simultaneous measurements of the suction head, volumetric water content, and the acoustic admittance of unsaturated sands. Samples of unsaturated sands are tested under controlled laboratory conditions. Several types of uniform sand with a wide range of particle sizes are investigated. The reported experiments are based on a standard Buchner funnel setup and a standard acoustic impedance tube. It is a novel, nondestructive, and noninvasive technique that relates the key geotechnical parameters of sands such as volumetric water content, density, and grain-size distribution to the acoustic admittance and attenuation. The results show a very sensitive dependence of the acoustic admittance on the volumetric water content controlled by the value of suction head applied. Analysis of the obtained data demonstrates that the relationship between the volumetric water content and the real part of the surface admittance in the frequency range of 400–1,200 Hz can be represented using a logarithmic equation. It is found that the coefficients in the proposed equation are directly related to the uniformity coefficient and the acoustic admittance of the dry sample, which can easily be measured or predicted for a broad range of sands. A validation exercise is conducted to examine the accuracy of the proposed equation using a sand sample with markedly different properties. The results of the validation exercise demonstrate that the proposed relations can be used to determine very accurately the volumetric water content within the porous specimen from the acoustical data. The error in the acoustically measured volumetric water content is found to be ±2.0% over the full range of volumetric water contents ( 0≤θ≤n , where n is the sample porosity).
    URI
    http://hdl.handle.net/10454/6099
    Citation
    Mohamed, M. H. A., Horoshenkov, K. V. (2009) Airborne acoustic method to determine the volumetric water content of unsaturated sands. Journal of Geotechnical and Geoenvironmental Engineering, 135 (12), 1872-1882.
    Link to publisher’s version
    http://dx.doi.org/10.1061/(asce)gt.1943-5606.0000168
    Type
    Article
    Collections
    Engineering and Informatics Publications

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