基岩斜坡变形与破坏的岩体结构模式分析

Analysis of the Modes of Rock Mass Structure on Slope Stability

岩体结构 ,特别是软弱结构面对基岩斜坡变形与破坏具有显著的控制作用 ,岩体结构模式分析是建立斜坡地质模型和数学模型的关键和评价斜坡稳定性的基础。岩层层面、断裂构造、节理裂隙、片理与劈理以及侵入体和围岩的接触带等是控制基岩斜坡稳定的软弱结构面 ,这些成因不同、大小不一的结构面将岩体分割成性质各异、力学强度不均的各种岩体结构体 ,构成了 15种基岩斜坡变形、破坏的岩体结构基本模式。不同结构体的重新组合与排列是斜坡失稳的内在原因。三峡库区

Stability of rock slopes is generally controlled by the structure of rock masses,especially the soft structure surfaces.Analysis of rock mass structures is a key to establish geological models and numerical simulation and a foundation to assess the stability of rock slopes.The weak structure surfaces are mainly bedding planes,faults,joints,schistosity plane and contact zones of intrusive bodies.Since they are different in genesis and scale,the rock masses are different in features and mechanical intensities.Based on the combination of rock structure bodies,15 basic modes of deformation and failure of rock slope are systematically summarized.The deformation and failure of rock masses actually result from the recombination and rearrangement of these rock bodies.There are 11 types of rock mass structures and various deformation and failure of bank slopes are present in the reservoir area of the Three Gorge Project.