中外公路2025，Vol.45Issue(3)：1-8,8.DOI:10.14048/j.issn.1671-2579.2025.03.001
板裂结构岩体边坡弯折变形机制的非连续变形分析
Discontinuous Deformation Analysis of Progressive Toppling of Rock Slopes with Fractured Slab Structure
摘要
Abstract
Progressive toppling of rock slopes with fractured slab structures is quite common in the slopes of hydropower and highway engineering,posing a potential safety risk during both construction and operational phases.The field investigation found that progressive toppling mostly occurs on slopes with concentrated tectonic stress,intense river incision,and high steepness.Typically,these slopes are composed of hard,thinly-layered,and overthrusted rock mass with a fractured slab structure.From a macroscopic point of view,progressive toppling failure is neither a collapse nor a slide but a form of discontinuous deformation.The traditional limit equilibrium method for slope stability analysis is not suitable for evaluating such slopes.In this paper,by taking the progressive toppling of the slopes along the G108 Highway in the Qinling Mountains as an example and considering the uplift of the mountain and river downcutting,a discontinuous deformation analysis(DDA)method was employed to simulate the entire process of progressive toppling,and the mechanisms of its evolution were analyzed.The results show that as the river downcutting progresses,the rock mass experiences interlayer shearing along bedding planes under the influence of gravity,gradually tilting toward the river valley.Once a through-going rupture area develops,it transforms into a landslide failure.For the evaluation of such slopes,a numerical model should be used to simulate the entire deformation failure process.This allows for the estimation of the current state and development trends,providing a basis for reinforcement and management.关键词
板裂结构岩体/弯折破坏/DDA/河谷侵蚀/岩体边坡Key words
rock mass with fractured slab structure/progressive toppling/DDA/river downcutting/rock slope分类
交通工程引用本文复制引用
袁思凡,李同录,Haider Mumtaz,张常亮,李萍..板裂结构岩体边坡弯折变形机制的非连续变形分析[J].中外公路,2025,45(3):1-8,8.基金项目
国家重点研发计划项目(2021YFE0111900) （2021YFE0111900）
