Stability analysis of large rock mixture slope under excavation in FAST location

The excavation stability of large rock mixture slope in FAST location is important to the project.This paper studies the possible two damage models that are deep layer sliding in the slope and the rock block failure in the surface layer,by choosing typical section.The results show that the stability factor of the most dangerous slip surface is about 2.8.So the large rock mixture slope will not slide inside.The rock block in the surface layer of the upper part of the slope is easier to destabilizing because losing the sustainment.The subsequent rock blocks move subsequently.Th erock blocks accumulate again in the movement,which show that the large rock mixture has the ability of self-stabilization.The conclusions can be presented as the reference to estimation of stability to large rock mixture in FAST location and similar geologic body.