大岗山水电站地下厂房开挖应力应变控制实践

Practice on stress and strain control in underground powerhouse excavation of Dagangshan Hydropower Station

为科学控制大岗山水电站地下厂房施工过程中围岩的应力和变形,针对厂房的结构特点及地质条件,通过采取地质预报预测、控制地下水、优化施工程序、控制爆破、先洞后墙贯通工艺、及时支护、提高开挖支护质量、加强安全监测管理及信息反馈等综合措施,使地下厂房实际发生的围岩变形总体较小,变形控制达到国内同类工程领先水平。详细介绍了施工控制过程,可为同类工程施工提供借鉴参考。

In view of the structural characteristics and geological conditions of the powerhouse,the comprehensive measures such as geological forecast,groundwater control,construction process optimization,blasting control,transfixion of cave first and wall later,in-time support,excavation quality improvement and enhancement of safety monitoring and information feedback,etc.are adopted to scientifically control the stress and deformation of surrounding rock of underground powerhouse of Dagangshan Hydropower Station,so that the overall deformation of surrounding rock is small to achieve the advanced level during the similar domestic projects.Moreover,the construction process is introduced in detail,which can provide a reference for similar projects.