Experimental investigation of the dielectric properties of soil under hydraulic loading

Bittner, Tilman, Bore, Thierry, Wagner, Norman, Karlovsek, Jurij and Scheuermann, Alexander  (2017) Experimental investigation of the dielectric properties of soil under hydraulic loading. Measurement Science and Technology, 28 4: . doi:10.1088/1361-6501/aa5442

Author Bittner, Tilman
Bore, Thierry
Wagner, Norman
Karlovsek, Jurij
Scheuermann, Alexander 
Title Experimental investigation of the dielectric properties of soil under hydraulic loading
Journal name Measurement Science and Technology   Check publisher's open access policy
ISSN 1361-6501
Publication date 2017-04-01
Sub-type Article (original research)
DOI 10.1088/1361-6501/aa5442
Open Access Status Not yet assessed
Volume 28
Issue 4
Total pages 13
Place of publication Bristol, United Kingdom
Publisher Institute of Physics Publishing
Language eng
Abstract An experimental set-up was developed in order to determine the coupled hydraulic, dielectric and mechanical properties of granular media under hydraulic loading. The set-up consisted of a modified column for permeability tests involving a flow meter and pressure transducers along the sample to quantify the hydraulic gradient. A newly developed open-ended coaxial probe allowed the measurement of the frequency dependent dielectric permittivity of the material under test. The shear strength of the sample within the column was measured using a conventional vane shear device. In this paper, the overall set-up is introduced with focus on the open-ended coaxial probe. The design and calibration of the probe are introduced in detail. A numerical study showed that the sensitive cylindrical volume of the probe was approximately 150 mm in diameter with a depth of 65 mm. An investigation with glass beads showed that the set-up allowed the parameterization of the hydraulic, mechanic and dielectric parameters of granular materials under the influence of vertical flow. A satisfactorily good correlation between porosity and the real part of the dielectric permittivity was detected. The critical hydraulic gradient defining the transition of a fixed bed of particles to fluidization was characterized by a sharp peak in the evolution of the hydraulic conductivity and could easily be determined from the measurements. The shear strength of the material under test reduces linearly with increasing hydraulic gradient. Future investigations will be carried out to provide the required parameterizations for experimental and numerical investigations of the internal erosion of granular media.
Keyword Fluidization
Granular media
Open-ended coaxial probe
Porosity measurements
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
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