Investigating the Effect of NaCl Content of Pore Water on the Electrical Resistivity of Sand Samples in the Laboratory

Geophysical laboratory measurements are important to provide data base for better interpretation of field surveys as well as developing new applications of these methods. The purpose of this research is to study the effect of NaCl content of pore water on the electrical resistivity of saturated samples of sand. To do this, water samples of different salinities were first prepared and their resistivity values were determined. Then, laboratory measurements of electrical resistivity were carried out on saturated sand samples of different grading. The results of all the tests showed that as the salinity of the pore water is increased, the resistivity of the sand samples decreases. Moreover, it was observed that using samples of equal NaCl content, the coarser the soil, the higher resistivity is measured.