长龙山抽水蓄能电站地下厂房岩体变形分析

Deformation Analysis of the Surrounding Rock Mass in Underground Powerhouse of Changlongshan Pumped Storage Power Station

长龙山抽水蓄能电站地下厂房开挖规模较大,施工过程中围岩最大变形超过40 mm,结合监测数据、地质条件、施工程序对地下厂房的围岩变形量、分布以及变形较大部位进行分析,并采用统计模型分离岩体蠕变变形与弹性变形,结果表明,地下厂房围岩破坏主要受结构面控制。针对突变部位,依据监测成果快速反馈,经加强支护,后续开挖过程变形不明显,充分发挥了安全监测指导施工的作用。

The underground powerhouse of Changlongshan Pumped Storage Power Station is of a large excavation scale.The maximum deformation of the surrounding rock during the excavation construction exceeds 40 mm.Considering the monitoring data,the geological conditions and the construction procedures,the deformation of the surrounding rock of the underground powerhouse is analyzed,including the amount and distribution of deformation,and the location of large deformation areas.Also,the creep deformation and the elastic deformation are separated with statistical models.The results show that the failure of the surrounding rock is mainly controlled by structural planes.Based on the rapid feedback of monitoring data,supports of locations with sudden change of deformation are strengthened.After the treatment,the deformation in the subsequent excavation process is effectively controlled,which demonstrates the role of safety monitoring in construction guidance.