Abstract: Evaluation of the cohesive soil ground engineering properties is one of the important research subjects. Many engineers take their attention to this subject. Resistivity method is widely used in the environmental monitoring and geological exploration, which has the characteristics of comprehensive, in-situ nondestructive and fast. Five typical cohesive soils sites in Shanghai are used in this article. And the resistivity log test and engineering properties test are performed. The change rule of the resistivity, water content and density is analyzed; and the evaluation method of engineering properties method based on resistivity is presented. It is shown that from the researches that the resistivity increases with moisture content in an exponential function, and decreases with the density in a linear function. There is an exponential function relation between resistivity and plasticity index. Meanwhile, the shear and compression properties are related to the pore properties of cohesive soil; and the resistivity is one of the parameters of soil pore characteristics. There is an exponential function relation among resistivity, cohesive force and compression coefficient; and a linear function relation among resistivity, friction angle and compression modulus. It is concluded that the resistivity can be used as an index to evaluate the engineering properties of cohesive soil site based on above analysis.

Key words: resistivity log method, physico-mechanical indexes, engineering property