Experimental Research on the Shear Strength Parameters between the Freezing and Thawing Surface of Soil Slope in Seasonal Frozen Regions

Abstract

In seasonal frozen regions, shallow landslide hazards in soil slopes usually happen. The failure surface is always freezing and thawing surface in the soil slope, so the direct influence factor of soil slope failure is the soil shear strength of the freezing and thawing (F-T) surface in this region. The shear strength of the soil is determined by the two parameters of cohesion “c” and friction angle “φ”. In this research model the experiment of F-T soil interfacing with different aggregate materials is designed by alternating the F-T cycle times and the water content of soil to obtain the c and the φ. Finally the deterioration modal of the two shear strength parameters of soil interfacing with the increase of water content and freezing and thawing circle times is put forward. The results demonstrate that, to analyze the slope stability in the seasonal frozen regions using shear strength reduction method, the two deterioration modals can provide the data reference for the analysis, and the consult for the soil slope design and stability analysis in seasonal frozen regions could be offered.