关键词: 顺层斜坡, 软弱夹层, 河谷下切面, 破坏模式, 三峡库区,

Abstract: In order to study the influence of different contact relationship of river valley erosive surface and weak intercalated layer on failure modes and formation mechanism of bedding slope,we established corresponding numerical model by UDEC and made an in-depth discussion according to the engineering geological characteristics of bedding landslides in the Three Gorges Reservoir Area.The results showed that:the contact relationship of river valley erosive surface and weak intercalated layer caused three failure modes,i.e.,slipping-shearing,slipping-cutting,slipping-bending-collapse.The transformation process and genesis mechanism of deformation and failure modes of bedding slope under different incising depth were obtained.Combined with the actual cases in the Three Gorges Reservoir Area,the three failure modes were verified.According to the research results,it can not only provide reasonable and effective guidelines for practical engineering,but also help to understand the disaster mechanism and failure mode of bedding slope.

Key words: bedding slope, weak intercalated layer, river valley erosive surface, failure mode, Three Gorges Reservoir Area