Abstract: The original natural stress balance of the rock structure is destroyed by human engineering activities of excavation and construction, and the geological environment safety is deteriorated further by the existence of weak structural plane. Therefore, it is necessary to analyze the stress state and strength characteristics of rock structure under engineering disturbance to effectively control the occurrence of geological disasters such as collapse and landslide. In this paper, the disturbance process of the rock structure was quantified in the form of stress. The propagation of the stress wave in weak structure plane was analyzed and its attenuation characteristics were quantified. Also, the quantification expression of stress was given and the stress analysis model was established. Based on this, the criterion of strength analysis of rock structure under stress disturbance was deduced by the Coulomb-Navier criterion. At the same time, the damage effect of stress disturbance on the strength of rock structure was realized and the reduction coefficient was used to quantitatively describe it. The realization of this process provides a theoretical basis for effective prevention and control of geological disasters caused by engineering disturbance, and a new idea to analyze the induced mechanism of geological disasters under engineering disturbance is given.

Key words: disturbance of stress wave, rock structural plane, stress quantification, strength characterization