The Influences of Basic Physical Properties of Clayey Silt and Silty Sand on Its Laboratory Electrical Resistivity Value in Loose and Dense Conditions

Non-destructive test which refers to electrical resistivity method is recently popular in engineering, environmental, archaeological and mining studies. Based on the previous studies, the results on electrical resistivity interpretation were often debated due to lack of clarification and evidences in quantitative perspective. Traditionally, most of the previous result interpretations were depending on qualitative point of view which is risky to produce unreliable outcomes. In order to minimise those problems, this study has performed a laboratory experiment on soil box electrical resistivity test which was supported by an additional basic physical properties of soil test like particle size distribution test (d), moisture content test (w), density test (rho(bulk)) and Atterberg limit test (LL, PL and PI). The test was performed to establish a series of electrical resistivity value (ERV) with different quantity of water content for clayey silt and silty sand in loose and dense condition. Apparently, the soil resistivity value was different under loose (L) and dense (C) conditions with moisture content and density variations (silty SAND = ERVLoose: 600 - 7300 Omega m & ERVDense: 490-7900 Omega m while Clayey SILT = ERVLoose: 13-7700 Omega m & ERVDense: 14-8400 Omega m) due to several factors. Moreover, correlation of moisture content (w) and density (rho(bulk)) due to the ERV was established as follows; Silty SAND: w((L)) = 638.8 rho(-0.418), w((D)) = 1397.1 rho(-0.574),rho(Bulk(L)) = 2.6188e(-6E-05 rho), rho(Bulk(D)) = 4.099 rho(-0.07) while Clayey SILT: w((L)) = 109.98 rho(-0.268), w((D)) = 121.88 rho(-0.363), rho(Bulk(L)) =-0.111ln(rho) + 1.7605, rho(Bulk(D)) = 2.5991 rho(-0.037) with determination coefficients, R-2 that varied from 0.5643-0.8927. This study was successfully demonstrated that the consistency of ERV was greatly influenced by the variation of soil basic physical properties (d, w, rho(Bulk), LL, PL and PI). Finally, the reliability of the ERV result interpretation can be enhanced due to its ability to produce a meaningful outcome based on supported data from basic geotechnical properties.