Experimental Study on the Relationship Between Unconfined Compressive Strength and Resistivity of Cured Diesel-Contaminated Soil

To realize the rapid evaluation of soil strength characteristics after solidification and disposal of diesel-contaminated soil, the indoor unconfined compressive strength test was carried out, and the change process of soil resistivity was measured synchronously by the two-phase electrode method. The stress-strain-resistivity synchronous change curve of solidified diesel-contaminated red clay was obtained. The effects of water content, pollution concentration and curing age on resistivity were analyzed, and the quantitative relationship between resistivity and unconfined compressive strength was analyzed. The test results show that under the three influencing factors, the stress-strain-resistivity synchronous change curve shows a good agreement. The stress-strain curve shows a trend of steep rise and then decline during the compression process, and the corresponding resistivity-strain curve shows a trend of steep decline and then gentle rise. The initial resistivity of solidified diesel-contaminated soil increases with the increase in water content, pollution concentration, and curing age. By using the linear fitting method, the curve equation of the initial resistivity to predict the unconfined compressive strength of the soil under different pollution concentrations is established, which provides a theoretical basis for the rapid evaluation of the improved soil strength in the project.