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Improving TDR for use with fine-grained soilsNormal access

Authors: A.M. Thomas, G. Curioni, K.Y. Foo, P.R. Atkins, C.D.F. Rogers and D.N. Chapman
Event name: First International Conference on Frontiers in Shallow Subsurface Technology
Session: Electric Characterization Methods and Time Domain Reflectometry
Publication date: 20 January 2010
Organisations: Delft University of Technology, EAGE
Language: English
Info: Extended abstract, PDF ( 175.23Kb )
Price: € 20

Time-Domain Reflectometry (TDR) provides a robust and widely used method for the monitoring and characterisation of soils using user-friendly cable testers. However, the simplicity of common TDR practice, often utilizing only measurements of reflection distances for electromagnetic signals in probes, causes a number of difficulties when applied to fine-grained soils, largely because they can be electromagnetically dispersive: that is their dielectric 'constants' vary with frequency. This paper therefore considers two ways in which TDR data can be made to greater use in geotechnical disciplines: supplementing TDR with frequency-domain data, and addressing the issues of standardisation and data sharing.

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