INVESTIGATION ON THE SENSITIVITY OF INFLUENCING FACTORS AND A GEOMETRIC MODEL FOR SLOPE STABILITY ANALYSIS IN THE MIDDLE AND UPPER REACHES OF LANCANG RIVER
Toppling is a prevalent form of instability in anti-dip rock slopes,and its deformation and failure are in-fluenced by multiple factors.In order to investigate the extent of influence exerted by various factors on the tipping deformation of anti-dip slopes and their control over the deformation mode,this study focuses on the anti-dip rock slope in the middle and upper reaches of the Lancang River as a research subject.A systematic framework is estab-lished for analyzing toppling deformation in anti-dip slopes,and the sensitivity of different influencing factors is ex-amined through discrete element numerical simulation tests combined with an improved grey correlation analysis the-ory.The geometric model prone to overturning deformation of anti-inclined slope in the study area is predicted based on the support vector regression(SVR)theory,incorporating slope geometric feature parameters.The results indicate that:(1)The geometric characteristic parameters of the anti-dip slopes have the highest level of sensitivity,followed by horizontal tectonic stress,while the mechanical parameters of the rock mass demonstrate the weakest sensitivity;(2)The deformation amount and depth of anti-dip slopes exhibit a positive correlation with the upper and lower slope angles,while the deformation depth demonstrates a positive correlation with the dip angle of rock layers.How-ever,the deformation amount initially increases and subsequently decreases as the dip angle of rock layers increa-ses;(3)Four deformation patterns have been identified within the study area,namely stable slope,potential de-formation slope,shallow toppling slope and deep-seated toppling slope;(4)In the study area,slopes with a dip an-gle of less than 57°generally exhibit stability;shallow toppling deformation may occur when the dip angle exceeds 57°,deep-seated toppling deformation becomes possible beyond 63°,and at an inclination of 81°,the slope is high-ly susceptible to toppling deformation.The research findings offer a dependable theoretical framework for the early i-dentification and hazard assessment of slope deformations in the field.
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