500m级顺层陡倾特高人工边坡破坏模式分析与开挖支护设计

Failure mode and excavation support of 500 m grade steeply-inclined bedding rock mass of an ultra-high artificial slope

为研究锦屏一级水电站大奔流沟料场500 m级顺层陡倾特高人工边坡破坏模式、为边坡开挖与支护设计提供依据,应用工程地质分析和数值模拟方法,研究了浅层滑移剪出破坏、深层滑移剪出破坏、压剪溃屈破坏、压裂滑移剪出破坏和随机块体破坏几种可能存在的边坡破坏模式,并以边坡破坏模式为基础,提出了开挖及支护设计建议。结果表明:压剪溃屈破坏和压裂滑移剪出破坏模式是500 m级顺层陡倾特高人工边坡特有的破坏模式;基于边坡破坏模式的边坡开挖与支护设计是有效的,可以保证人工边坡的整体稳定性,实现边坡的长期安全运行。

In order to study the failure mode of 500 m grade steeply-inclined bedding rock mass of an ultra-high ar⁃tificial slope in Dabenliugou quarry of Jinping I Hydropower Station and provide a basis for slope excavation and support design,based on the engineering geological analysis and numerical simulation,the potential failure modes of slope,including shallow slip shear failure,deep slip shear failure,compression shear buckling failure,fracturing slip shear failure and random block failure,are studied.Based on the failure modes,the designs for excavation and support of this slope are proposed.The results showed that the failure modes of compression shear buckling and frac⁃ture slip shear out are the unique failure modes of 500 m grade steeply-inclined bedding rock mass of ultra-high ar⁃tificial slopes;the slope excavation and support designs based on the slope failure modes are effective,which can en⁃sure the overall stability of this artificial slope and realize its long-term safe operation.