工程地质学报2024，Vol.32Issue(3)：1035-1056,22.DOI:10.13544/j.cnki.jeg.2024-0060
澜沧江中上游反倾斜坡倾倒变形影响因素敏感性及斜坡易倾倒几何模型研究
INVESTIGATION ON THE SENSITIVITY OF INFLUENCING FACTORS AND A GEOMETRIC MODEL FOR SLOPE STABILITY ANALYSIS IN THE MIDDLE AND UPPER REACHES OF LANCANG RIVER
摘要
Abstract
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.关键词
反倾斜坡/UDEC/改进灰色关联分析/敏感性分析/倾倒变形Key words
Anti-dip slope/UDEC/Improved grey correlation analysis theory/Sensitivity analysis/Toppling de-formation分类
地质学引用本文复制引用
霍秉尧,宁奕冰,唐辉明,彭建兵,申艳军,马鹏辉..澜沧江中上游反倾斜坡倾倒变形影响因素敏感性及斜坡易倾倒几何模型研究[J].工程地质学报,2024,32(3):1035-1056,22.基金项目
国家自然科学基金项目(资助号:42307220,42090055),陕西省博士后科研项目(资助号:2023BSHEDZZ210).This research is supported by the National Natural Science Foundation of China(Grant Nos.42307220,42090055)and the Postdoctoral Research Project Funding of Shaanxi Province(Grant No.2023BSHEDZZ210). （资助号:42307220,42090055）
