Analysis of Subgrade Slope Stability in Cold Region Based on Rock and Soil Water-physical Properties

The stability of subgrade slopes in cold regions is analyzed based on the water-physical properties of rock and soil. The stability of the subgrade in the cold area is mainly affected by the coupling effect of water and temperature, that is, the freeze-thaw cycle and the thawing process. The rock slope is mainly affected by freeze-thaw cycles, which causes freeze-thaw damage, reduces its strength and causes instability. Due to the change of the water phase, the soil slope softens and swell-shrink, accordingly its cohesion, internal friction angle and strength decrease. Its slope stability coefficient is closely related to the melting depth and the saturation of the melting layer.