معرفي روش مقاومت سنجي الكتريكي جهت آزمايش غيرمخرب اندازه گيري درجه اشباع نمونه هاي خاك

Application of resistivity method as nondestructive test for measurement of degree of saturation of soil specimens

Application of electrical resistivity method in civil engineering is based on the relationship between the electrical resistance, the water content and the inherent characteristics of the soil. This method is usually used to investigate the soil stratification and the ground water table. This research is aimed to verify the capability of resistivity method for measuring the degree of saturation of soil samples. The importance of this research is that this method may be used asa nondestructive test for subsecutive measurement of" saturation degree of specimens being under other tests such as triaxial test, consolidation test, long term permeability test etc. In other wards this method will permit one to follow the variation of degree of saturation of any sample during any other tests. The material used was a nonplastic glacial till from northern Quebec, Canada. Two series of tests were conducted on specimens compacted with different water contents to an identical void ratio. In the first series, the influence of magnitude of voltage on the distribution of voltage throughout the specimen as well as the voltage loss at the pole contact area was investigated. In the second series of tests, the relation of saturation degree -voltage loss across the specimen was studied and developed. The results show that this method can be used as a rapid and nondestructive test with relatively good precision.