Abstract
The University of British Columbia (UBC) began performing piezocone penetration tests (CPTU) with electrical resistivity measurements (RCPTU) in 1989. Since then, RCPTU research at UBC has been focused on obtaining geo-environmental parameters such as fluid resistivity and soil engineering properties such as porosity and degree of saturation using the empirical relationship proposed by Archie (1942). The relationships between these three factors and the bulk soil electrical resistivity are concisely reviewed within the framework of Archie’s relationship and methods of isolating individual factors for study are discussed. Key design issues for resistivity modules such as the use of isolated circuitry to achieve linear calibrations over large ranges of resistivity are described. The suitability of RCPTU for monitoring individual factors is assessed using typical ranges of soil and groundwater properties. Practical aspects of resistivity module calibration including calibration chamber dimensions and temperature considerations are discussed. Illustrative examples of RCPTU research efforts including the environmental characterization of mine tailings, delineation of saline water intrusions in fresh water aquifers and the quality control of geotechnical ground densification are presented throughout the text.
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