Chapter
Jun 20, 2012
Development of a New TDR Probe for Determining Soil Water Content and Dry Density
Publication: Problematic Soils and Rocks and In Situ Characterization
Abstract
A few traditional methods for determining water content in the field are either inaccurate or time consuming. As an alternative, the time domain reflectometry (TDR) technology has been used in the determination of the soil water content for geotechnical applications. This paper presents the preliminary results on the development of a new TDR probe for determining soil water content and dry density at different depths. This new probe is intended to be pushed into the ground using piezocone equipment. Different from the standard TDR probes with straight rods, the new probe consists of two parallel copper stripes coiled around a PVC-steel core. The probe diameter is the same as the standard 10 cm2 piezocone diameter. Through laboratory calibrations, it is possible to establish expressions relating the soil apparent dielectric constant and the bulk electrical conductivity with the gravimetric water content and the dry density.
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Copyright
© 2007 American Society of Civil Engineers.
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Published online: Jun 20, 2012
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ASCE Technical Topics:
- Density (material)
- Density currents
- Engineering fundamentals
- Equipment and machinery
- Field tests
- Fluid dynamics
- Fluid mechanics
- Geomechanics
- Geotechnical engineering
- Hydrologic engineering
- Hydrologic properties
- Hydrology
- Material mechanics
- Material properties
- Materials engineering
- Probe instruments
- Soil mechanics
- Soil properties
- Soil water
- Tests (by type)
- Water and water resources
- Water content
Authors
Affiliations
Department of Geotechnical Engineering, University of São Paulo, Av. Trabalhador Sao-Carlense 400, 13566-590 Sao Carlos, SP, Brazil;. E-mail: [email protected]
Department of Civil Engineering, São Paulo State University, P.O. Box 473, 17033-360 Bauru, SP, Brazil;. E-mail: [email protected]
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