关键词: 大型地下厂房, 施工期, 围岩监测成果

Abstract: Monitoring is one of the important bases for dynamic design and information construction in underground project, and the analysis and reporting of monitoring information are even more important, if they are all-sided, accuracy and timely. The excavation of underground powerhouse of Pengshui project in Wujiang River faces many problems, such as large-scale span and height, complex geological conditions, long period, the disturbance of construction, etc. In order to ensure safety of construction and operation, many monitoring instruments were installed in underground powerhouse, which were used to monitor the deformation and stability of surrounding rockmass in construction. The analysis of monitoring results indicate: the surrounding rockmass of underground powerhouse is stable in general; design supports can enhance the self-stability of rockmass and ensure the stability of underground powerhouse; however, the stability of some local rock masses, especially the shale in the downstream sidewall are bad due to geological condition and rockmass blasting.

Key words: large-scale underground powerhouse, construction period, monitoring results of rock mass