| Citation: | Yuan Shuqing, Sun Ronglin, Xing Jinbing, Xiao Wei. Experimental study on the electrical resistivity characteristics of sand under different testing conditions[J]. Bulletin of Geological Science and Technology, 2023, 42(5): 257-263. doi: 10.19509/j.cnki.dzkq.2022.0101
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The results of laboratory tests on the electrical resistivity of sand are widely used in the interpretation of field electrical resistivity tomography. However, the influences of testing conditions and the field implementations of relationship curves between the electrical resistivity and properties of sand need further research.
First, the electrical resistivity test device was developed by using the two-electrode method. Then, the influences of current type, alternating current (AC) frequency, voltage and grain size of sand on the relationship between electrical resistivity and water saturation (
The results showed that an AC current frequency of 10 Hz and an input voltage of 1 V were recommended to reduce the test error of resistance. There was a power function between the electrical resistivity and water saturation (
Research results comfirm the electrical resistivity method easily distinguishes fresh water from brackish water but has difficulty further subdividing brackish water, salt water and brine.
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