乌江构皮滩水电站地下厂房围岩稳定问题及处理

The Problem and Its Treatment about Wall Rock Stability of Goupitan Hydropower Station's Underground Powerhouse Station in Wu River

乌江构皮滩水电站电站厂房为岩溶地区修建的特大型地下厂房,围岩稳定问题较突出,影响围岩稳定的因素主要有岩溶与不利结构面及其组合的块体等。从前期选址、布置到后期施工处理过程中,进行了大量工程地质研究,并提出了合理的布置及处理方案。目前地下厂房已开挖完成,进入机组安装阶段,在整个施工过程中没有出现岩溶涌水、涌泥以及规模较大的块体失稳现象,围岩的变形经过施工处理已基本收敛,从监测情况来看,围岩处理效果良好。

The underground powerhouse of Goupitan Hydropower Station in Wu River is an oversize powerhouse built in the karst area. The stability problem of wall rock was prominent, and the factors that affect the wall rock stability including karst, disadvantage structure surface, and the block body combined by the two factors. During the process of prophase site choosing, collocation, and construction treatment, a great deal of study on project geology was implemented, and rea- sonable disposal and treatment scheme were brought forward. At present, the underground powerhouse digging was fin- ished and has enter the phase of set installment. During the whole construction process, the events of water and mud sur- ging, and block body losing stability did not occurred;the distortion of wall rock has been converted after construction treatment, and the effect of wall rock treatment seems good from the monitoring.