Abstract: In the case of reverse inclined layer-like slope failure mechanism and stability analysis, due to the general good stability of the system, the intensive study is not very much in terms of its failure mechanism and stability. A gentle reverse inclined layer-like rock slope formed by several volcanic eruption cycles is introduced, and the tilt of layered rock slope as the research object, based on the finite element analysis of the displacement vector diagram, reveals the slope deformation failure mechanism and stability of the control elements; The stability is evaluated by using limit equilibrium method and vector sum analysis method. Using strength subtraction analysis regularity of plastic zone, it reveals time space law of the development of the slip surface. The results show that: (1) The similar layered rock slope is the tilting of the potential failure mode is shear-tension, sliding surface morphology of approximate folded line, slope through the tuff interlayer and strongly weathered rock mass, the trailing edge passes through the steeply dipping structural surface. (2) The limit equilibrium method and vector sum analysis method of comprehensive evaluation show that the stability of shallow slope stability does not meet the requirements of the engineering stability; stability of deep satisfies the stability requirement; and the safety factor of 3 D vector sum is greater than 2 D; this is caused by 3 D effect. (3) The spatial development sequence of the sliding surface reveal by the expansion of the plastic zone is sliding surface 4, sliding surface 5-3. The technical route and analysis scheme of this paper can be used to evaluate the stability of the gentle reverse inclined rock slope.

Key words: bridge load, seismic load, vector sum analysis method, reverse inclined layer-like slope, slope stability