The results indicate that the damage area induced by the dynamicunloading is larger than that induced by the static unloading during blasting excavation.
The theory about stress wave and its propagation is employed to analyze the effect of dynamicunloading during excavation of jointed rock mass slope under high geostress.
The process of the dynamicunloading of the initial stress can be employed to explain the mechanism of the loosing of jointed rock mass during rock excavation by blasting.