基于稳定性评价的坡体结构统一分类研究

Unified classification system of slope structure based on stability evaluation

回顾和讨论早期边坡结构的概念、分类方法和结构类型。为完善和统一边坡的结构分类体系,进一步阐释了坡体结构的概念,在地层岩性、软弱结构面发育程度及其与坡面的组合、岩体完整性、变形破坏特征等影响因素基础上,提出基于边坡稳定性评价的边坡统一分类体系,共划分出块状结构、似块状结构、非块状结构、碎裂散状结构和变形结构5大类21个子类的坡体结构类型。分类方法突出软弱结构面及其与坡面的组合特征对边坡稳定的控制作用;依据边坡稳定性属性,对传统的层状结构区分出似块状结构和非块状结构2个不同的结构类型;将土质边坡纳入分类并增加了变形结构类型。分类依据合理,易于理解,实用性强,对边坡地质勘察、边坡稳定性评价、失稳破坏模式识别、稳定性分析方法以及开挖与治理设计方案选择等均具有重要指导意义。

The concept,classification method and structure type of early slope structure are reviewed and discussed. In order to improve and to unify the structural classification system of slopes,this paper further explains the concept of slope structure. Based on the influencing factors such as formation lithology,development degree of weak structural planes and their combinations with the slope surface,rock mass integrity,and deformation and failure characteristics,a unified classification system of slopes based on slope stability evaluation is proposed,including 5 categories of massive structure,quasi massive structure,non block structure,cataclastic structure and deformation structure,and 21 sub categories. The classification method highlights the control effect of weak structural planes and their combinations with the slope surface on the slope stability,and divides the traditional layered structure into two different types of quasi massive structure and non massive structure according to the slope stability attribute. The soil slope is incorporated and the type of deformation structure is added in the classification system. The classification basis is reasonable,easy to understand and practical. It has important guiding significance for slope geological survey and slope stability zoning evaluation,instability failure mode identification and stability analysis methods,as well as the selection of excavation and treatment design schemes.