The excavation effect of complex rock high slope

In the course of complex rock slope excavation, with the rescission of lateral stress constraint, the rock mass will produce unloading rebound deformation to the free face. With this course, the primary equilibrium stress state in slope mass is broken, and secondary stress adjustment occurs, which will adapt to the deformation state of continual development until new balance. The result is that the distribution areas of secondary stress field form in the slope mass at a certain depth. Theoretically, when the slope deformation finished, the secondary adjustment is also over. For convenience of study, the primary equilibrium stress state before excavation is called the first balance state of ground stress. And the stress field of secondary adjustment named the second balance state after excavation. In this paper, a kind of slope is chosen to study by using numerical simulation. The ground stress release rules of highway cutting slope after excavation from first balance state to the second are researched. And the partition of secondary stress is also studied. The ground stress consideration in the slope stability analysis after excavation is discussed.