Improved infiltration model and stability analysis considering slope angle and unsaturated zone

Abstract To more accurately evaluate the infiltration dynamics and stability of soil slopes during rainfall, an improved model for soil slope infiltration and stability considering slope angle and unsaturated zone is constructed based on the traditional slope infiltration model. The slope infiltration potential gradient is adjusted by introducing the slope angle and unsaturated zone, and the slope is layered according to the distribution of soil moisture content. The improved model is verified by combining rainfall infiltration examples. It is indicated that the improved infiltration model predicts more accurately the depth of wet front advance and slope runoff time compared to the traditional slope infiltration model,. Especially during the stage of water infiltration, the improved infiltration model showed deeper wetting front depth, faster infiltration rate, and significantly delayed slope instability time, which has certain reference significance for quickly analyzing the infiltration law and stability of slopes under rainfall conditions.