白鹤滩水电站左岸地下厂房监测数据及围岩稳定分析

Analysis of monitoring data and stability of surrounding rocks of Baihetan underground power plants

白鹤滩水电站左岸地下厂房洞室群规模巨大,工程地质条件复杂。以地下厂房布置为基础,结合工程特点与地质条件,确定了左岸地下厂房的支护设计参数。基于开挖过程中的位移监测数据,系统分析了顶拱与边墙的变形特征,重点评价了地下厂房围岩的稳定状态。监测数据表明:左岸地下厂房的支护设计合理可靠,其围岩总体处于稳定状态。

The construction of underground powerhouse chambers of Baihetan Hydropower Station faces great challenges due to its large scale and complicated geological condition.Parameters for support design of underground power plants on the left bank have been specified based on its layout and features and geological conditions of the project.According to displacement monitoring data during excavation process,deformation features of top arch and side wall are systematically examined,with focus on evaluation of stability of surrounding rocks of underground powerhouse.The monitoring data indicates that the surrounding rocks are in stable state owing to reasonable and reliable design.