Experimental research on Influencing Factors of remolded fine soil strength

摘要

In order to research on the influence law of fine soil strength affected by plasticity index, moisture content,compactness, the unconfined compressive resilient modulus of the soil is as the evaluation index of remolded soil strength. Three fine soils with different plasticity index are selected from field. Test scheme was obtained with the method of orthogonal design. By the static molding method,the soil sample was compacted from the prescriptive moisture content and compactness. The unconfined compressive resilient modulus of the soil sample were tested respectively. The experiments show that sort of influencing factors is plasticity index, moisture content, compactness. With the increase of plasticity index, remolded soil strength increases and increasing extent is significantly large. With the increase of moisture content, remolded soil strength decreases and increasing extent is larger. With the increase of compactness, soil subgrade strength increases, but increasing extent is significantly small.The exponential function is adopted for multiple nonlinear fitting. The relationship between the unconfined compressive resilient modulus and plasticity index, moisture content, compactness is obtained and shows a good correlation.