Study of shear strength of silty clay under freeze-thaw cycle

Abstract

Silty clay is a common subgrade soil with a wide distribution in northeast China. The construction in the seasonal frozen area of silty clay in northeast China has become the norm. In the engineering construction, the shear strength characteristics of silty clay under different water content, different freezing temperatures and different cycle times of freeze-thaw should be considered. Based on the study of remolded silty clay, cohesion and internal friction angle are used as the shear strength indexes, and the influence of water content, freezing temperature and cycle time of freeze-thaw on the shear strength is analyzed by combining with the Gray Theory. The results show that the grey correlation degree of water content, freezing temperature and cycle time of freeze-thaw to cohesion is 0.97, 0.47 and 0.47, and to internal friction angle is 0.95, 0.45, 0.47, the water content towards cohesion and internal friction angle are linear negative correlation, freezing temperature has a best valuable impact on the shear strength, cycle time of freeze-thaw towards cohesion is linear positive correlation, and has little relationship with the internal friction angle.