Study on Electrical Resistivity Related Parameters of Contaminated Soils
Electrical resistivity method has been used in recent years for evaluating of contaminated soils. Based on laboratory measurement, the electrical resistivity properties such as average formation factor, average shape factor of heavy metal contaminated soi
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STUDY ON ELECTRICAL RESISTIVITY RELATED PARAMETERS OF CONTAMINATED SOILS Songyu Liu, Lei Chen Institute ofGeotechnical Engineering, Southeast University, Nanjing 2 J0096, China LihuaHan School ofresources and safety engineering, Central South University, Changsha 410083, China Electrical resistivity method has been used in recent years for evaluating of contaminated soils. Based on laboratory measurement, the electrical resistivity properties such as average formation factor, average shape factor of heavy metal contaminated soils were calculated and analyzed. The relationships between these three electrical resistivity related parameters and water content, porosity, type and contaminated component concentration were discussed. Results showed that the electrical resistivity, average formation factor and average shape factor decrease with the increase of water content, while the more serious the soils are polluted, the lower electrical resistivity, the higher the average formation factor and average shape factor are achieved. These test results may provide a guideline for detecting heavy metal contaminated soils by the electrical resistivity method. INTRODUCTION
How to evaluate the property of contaminated soil quantitatively has become increasingly important for contaminated site remediation. As a new detecting technique, electrical resistivity method has emerged for several decades. Contaminants influence the bulk resistivity of soil (Hassanein,1996). Since contaminants are often electrolytes or organic compounds, it is possible to distinguish between contaminated and uncontaminated soils from the variation of resistivity (Fukue,2001). The value of electrical resistivity is dependant upon the contaminant types and concentration as well as temperature condition. And soil intrinsic properties could also have a great effect on it, which including soil type, porosity, degree of saturation, water content, composition, salinity of the pore water, grain size distribution, particle shape and orientation, and pore structure (Hassanein,1996 and G.L.Yoon,2001). The applicability of electrical resistivity method (Fukue,2001 and G.L.Yoon,2001,2002) has been validated by in situ resistivity cone penetration test (RCPT)(Campanella, 1990) or laboratory model investigation. Quantitative correlation between electrical resistivity and the influencing factors has not been fully established. Using the values of formation factor and shape factor to assess the
contaminated soil is rarely seen. In this paper, laboratory tests are performed to investigate the variation of electrical resistivity of contaminated soils due to change of properties of contaminated soils. Related parameters calculated from electrical resistivity, defined as average formation factor and average shape factor are also discussed.
ELECTRICAL RESISTIVITY AND MEASUREMENT METHOD Electrical resistivity relatedparameters Each type of soil possesses a natural electrical resistivity ( Q . m ) which could be defined as the soil resistance when current passed perpendicular
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