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    Volume 41, Issue 2 (March 2018)

    Validation of a Thermo–Time Domain Reflectometry Probe for Sand Thermal Conductivity Measurement in Drainage and Drying Processes

    (Received 3 December 2016; accepted 24 July 2017)

    Published Online: 2018

    CODEN: GTJODJ

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    Abstract

    The thermo–time domain reflectometry (TDR) probe is a promising tool for simultaneous measurements of the thermal and geotechnical properties of soil under both laboratory and field conditions for geothermal applications. This study presents the validation of a thermo-TDR probe for sand thermal conductivity measurement during drainage and drying processes. Laboratory experiments were performed on four quartz sands with different particle sizes using a modified hanging column device. A KD2 Standard Pro was used to measure sand thermal conductivity, which was then compared with the results obtained by the thermo-TDR probe. A series of statistical analyses, including root mean square error, mean absolute error, and variance account for, was conducted to further evaluate the performance of the thermo-TDR probe for sand thermal conductivity measurement during the dryout process. It was concluded that the thermo-TDR probe can measure sand thermal conductivity accurately with at least 85 % confidence interval during the drainage and drying processes. The measurement accuracy of the probe increases as the grain size of the sand decreases.

    Author Information:

    Zhang, Nan
    Department of Civil Engineering, The University of Texas at Arlington, Arlington, TX

    Yu, Xinbao
    Department of Civil Engineering, The University of Texas at Arlington, Arlington, TX

    Wang, Xuelin
    Department of Civil Engineering, The University of Texas at Arlington, Arlington, TX


    Stock #: GTJ20160314

    ISSN:0149-6115

    DOI: 10.1520/GTJ20160314

    Author
    Title Validation of a Thermo–Time Domain Reflectometry Probe for Sand Thermal Conductivity Measurement in Drainage and Drying Processes
    Symposium ,
    Committee C08