Abstract：The traditional stability calculation method for bedding rock slopes mainly simplifies the slope into a plane sliding-tensile fracture failure model，conducting overall stress analysis. However，it neglects the progressive failure process along the polygonal sliding surface during the failure of bedding rock slopes. Study the failure mode，scope，and stability state of bedding rock slopes. Based on the limit equilibrium theory，the nonlinear Barton-Bandis failure criterion for rock joint surfaces was introduced. Considering the hydraulic action of bedrock fractures at the rear edge of the slope，the instability range of polygonal sliding surface bedding rock slope under the instability mode is calculated. Based on the redistribution model of shear stress in the excavation loose area，and according to the determination of shear stress on the sliding surface and the peak strength and residual strength of rock mass，identify different failure modes of excavated rock slopes. It includes progressive failure mode and multi-stage multi-block failure mode with stepped sliding surfaces. Provide corresponding failure ranges and calculation methods for stability coefficient Fs to determine the stability state of the slope. The results demonstrate that the theoretical calculation method proposed in this study aligns well with the failure extents and stability coefficient Fs obtained from engineering examples and three-dimensional discrete element numerical simulations. The theoretical calculation method is capable of reasonably analyzing the progressive failure mode of bedding rock slopes along folded sliding surfaces. Therefore，it provides valuable reference for related research.
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DU Zhaomeng，LIU Tianxiang，CHENG Qiang. Calculation method for the instability range of excavated bedding-rock slopes based on stepwise progressive failure. , 2025, 44(S1): 171-182.
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2025, Vol. 44 
