某大跨度地下厂房开挖过程变形监测研究

Study on deformation monitoring of large span underground powerhouse during excavation process

结合白山水电站抽水蓄能工程地下厂房施工实例,介绍了地下厂房开挖过程中的变形现场监测过程。监测地下厂房变形的仪器包括多点位移计和收敛计。随着同一施工层的继续向前开挖,引起地应力的进一步释放,导致地下厂房岩壁的向内移动,现场变形观测数据对于及时修改支护参数和开挖计划起到了关键的作用。

In combination with a practical construction project of pumped storage system of Baishan hydropower station, the deformation monitoring of large span powerhouse during excavation process is introduced in this paper. The monitoring instruments include multi-point displacement meter and convergence meter. With continuous advancing of excavation in the same construction layer, the ground stress is further released,the inward movement of rock walls of the under- ground powerhouse results,and the site deformation monitoring data play key roles in timely modifying support parameters and excavation plan.