缓倾层状高边坡典型破坏模式及宏观判据研究  

Typical Failure Modes and Identification of Low-angled Stratofabric Rock Slope

作　　者：董好刚[1] 彭轩明[1] 陈州丰[1] 刘广宁[1] 霍志涛[1] 

机构地区：[1]宜昌地质矿产研究所,湖北宜昌443003

出　　处：《长江科学院院报》2009年第8期36-40,共5页Journal of Changjiang River Scientific Research Institute

基　　金：中国地质调查局地质灾害预警项目(12120101640601)

摘　　要：缓倾层状高边坡是三峡库区典型的岸坡结构之一,其稳定性主要由岩体结构和岩性组合决定。通过对长江上游云阳—江津100个高边坡详细调查,针对缓倾角层状岩质边坡特殊情况,考虑其形成机理将三峡库区缓倾层状高边坡典型破坏模式概化为风化-崩落型、压剪-滑移崩落型、拉剪-倾倒崩落型、拉裂坠落型4种破坏模式。以岩体结构控制论为指导,结合实例分析了4种破坏模式的基本特征。从陡崖(坡)断面形状、主控结构面特征、优势面数目、节理密度以及岩性等方面构建了缓倾层状边坡破坏模式的宏观判据。经云阳—江津100个高边坡现场验证,利用这些宏观判据判识的破坏模式与实际相符。Stratified high slope with gently inclined bedding is one of the typical bank structures in Three Gorges Reservoir . The main controlling factors of embankment slope stability are engineering geological petrofabric and rock property. An investigation was carried out at 100 high slopes from Yunyang to Jiangjin in Chongqing . To the stratified slopes with gently inclined bedding , the findings show that there are four failure typical modes in high slopes. They are surface weathering mode, sliding mode under pressure-shear, falling mode of tension-shear and falling mode under tension. According to control theory of rock fissure and in combination with typical modes, the features of each category have been described. In view of the section outline of cliff or steep slope, the features of main control structural plane, the number of dominant plane, joint density, and lithology, the authors found macro-criteria to identify perilous rock in the field. These macro-criteria are checked with 100 modes from Yunyang to Jiangjin and are closely coincident with the real modes.

关 键 词：三峡库区 缓倾角层状边坡 破坏模式 宏观判据 

分 类 号：TV221.2[水利工程—水工结构工程]