锦屏一级水电站左坝肩边坡稳定性研究

从工程区的自然稳定斜坡调查入手，利用前期勘测的横剖面结果，获得工程区的砂板岩边坡和大理岩边坡的自然稳定斜坡的坡形数据；结合中国已建和在建水电边坡的开挖情况，采用自然斜坡比拟法和工程地质类比法综合确定拱间槽边坡的地质建议开挖坡比。在坝头深裂详细调查研究的基础上，分析拱间槽边坡开挖前后的可能失稳破坏模式及失稳块体的边界条件；通过采用三维极限平衡方法对可能失稳块体的计算模型进行分析，得到块体开挖前后的稳定系数；对失稳块体的稳定性进行详细评价，并提出块体加固方案建议，对类似工程提供可以借答的经验。

RESEARCH ON STABILITY OF SLOPE AT LEFT ABUTMENT OF JINPING FIRST STAGE HYDROPOWER STATION

First of all, according to the research on the transverse sections of the stable nature slope in the engineering area, the slope shape data of the sand-slate and marble slopes are gained. Secondly, in combination with data acquired from some slopes of the being built or built hydropower stations and natural slopes, the excavation angle is recommended for the dam abutment slope from perspective of geology. Thirdly, based on the characters research of the deep fracture at the left abutment slope in detail, the failure mode of the abutment slope and boundary condition of the potential failure block after excavation are analysed. During the analyses, 3D rigid limit equilibrium method is used to analyze the stability of the potential failure block in abutment slope in the nature and excavated stages individually. What is more, the computation model can be established massively or sectionally according to the assumption of different boundary conditions of the potential failure block. Finally, through comprehensive analysis, the conclusion that the sectional computation model is accordance with the dam abutment slope engineering is drawn. Reinforcement measures are put forward for the high slopes. The results can not only solve the practical engineering problems but also provide some referential experiences for similar projects.