Deformation factors and failure modes of bedrock landslides in Yangxin County, Hubei Province

Abstract

The deformation of slopes is comprehensively controlled by many factors, and the sensitivity and action rules of different factors are obviously different in the deformation process. This article takes the bedding landslide in Yangxin County, Hubei Province as the research object. Through orthogonal experimental design combined with 3DEC (distinct element method, DEM), the sensitivity of multiple influencing factors to the deformation of bedding landslides is studied, and the dominant factors are established. Then, based on the response surface method to fit the quantitative relationship between the dominant factors and the deformation degree of different parts of the landslide, the influence law of the interaction of dominant factors on the deformation and failure mode of landslides is revealed. The study of the slope in the Yangxin County area shows that the slope and the strata dip are the dominant and secondary dominant factors affecting the bedding landslide, and the interaction between the two has a significant impact on the slope deformation. In the medium-steep bedding landslide, when the slope is less than the angle of rock, the slope deformation mainly concentrates on the slope top, and the degree of deformation increases with increasing rock dip, showing the slip-bending deformation failure mode. In a gently dipping bedding slope, when the slope is larger than the angle of rock, the displacement of the slope toe is more significant than that of the slope top, and the deformation degree of the slope toe increases with increasing slope, showing the slip-rupture deformation failure mode. This study can provide guidances for the prevention and control of such landslides.

Keywords

• bedding bedrock landslide
• deformation factor
• sensitivity analysis
• factor interaction
• response surface design
• deformation failure mode
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