Detection of leachate contamination in Perth landfill base soil using electrical resistivity technique
International Journal of Geotechnical Engineering
Taylor and Francis Ltd.
School of Engineering
The electrical resistivity of landfill base soil changes when leachate infiltrates into the soil, due to leakage through the liner. This paper presents the results of an investigation into the effects of fluid (water and/or leachate) content of soil, and type of leachate on the electrical resistivity of Perth landfill base soil. The experimental apparatus used for the resistivity measurements was fabricated as per Australian standard AS 12220.127.116.11-1997. Three leachates were procured for the experimentation. The infiltrating fluid consisted of a mixture of water and leachates in varying concentration, to simulate the base soil contamination in field situations. The test results showed that the electrical resistivity of the Perth sandy soil decreased rapidly when the fluid content increased. The resistivity of the soil was found to decrease significantly with increase in the leachate content in the fluid. However, the rate of decrease of resistivity became less significant for fluid contents over 9%, irrespective of the leachate content in the fluid. Additionally, it was observed that the rate of decrease of resistivity was almost independent of the type of leachate for leachate contents more than 20%. The resistivity-leachate content curves for each of the leachates demonstrated a point of inflection at leachate content of 30%. The results indicate that the changes to the resistivity arising from changes to the fluid content are more significant than the effect of varying the leachate content or type within any specific mixture of water and leachate. Newly developed correlations between the resistivity and the geotechnical properties of the soil infiltrated with leachates, have also been presented. © 2017, © 2017 Informa UK Limited, trading as Taylor & Francis Group.