Energija, Vol. 56 No. 6, 2007.
Izvorni znanstveni članak
VALIDITY LIMITS OF THE EXPRESSION FOR MEASURING SOIL RESISTIVITY BY THE WENNER METHOD ACCORDING TO IEEE STANDARD 81-1983
T. Barić
D. Šljivac
M. Stojkov
Sažetak
For the analysis of soil resistivity results and measurement, engineers have guidelines and instructions from various international standards at their disposal. The circumstances under which the mathematical expressions in these standards were obtained are not always clear. One such case is described in this article and refers to the international IEEE Standard
81-1983, an expression for apparent soil resistivity, and refers to a theoretical model and the prediction and interpretation of measurement results obtained by using the Wenner method of electrode arrangement.
In IEEE Std. 81-1983, rod electrodes are modeled as spherical, which ultimately results in a simplified mathematical expression for apparent soil resistivity. Due to this simplification, the expression in this standard does not provide engineers with insight into its validity limits, i.e. accuracy. It is assumed that the user is highly educated, specialized or has obtained the necessary training. Therefore, this article presents the derivation of the expression for apparent soil resistivity in detail when measurement is performed using the Wenner method. Exhaustive commentary on the derivations is provided so that the material presented will be understood by the widest possible circle of readers. The expression obtained takes the actual geometry of the measurement electrodes and the influence of the distance between the electrodes upon measurement into account. Using a practical example, the results obtained using the derived expression are compared to results obtained using the expression proposed according to the international IEEE Std. 81-1983. The results of both approaches are presented graphically and analytically, and are discussed.
Ključne riječi
apparent soil resistivity; IEEE Std. 81-1983; soil resistivity; Wenner electrode arrangement
Hrčak ID:
20231
URI
Datum izdavanja:
31.12.2007.
Posjeta: 2.358 *