关键词: 岩体松弛, 地下厂房, 声波测试

Abstract: After the excavation of underground cavern, relaxation occurs in the surrounding rock of the cavern. Thus, determination of relaxation zone depth is important for evaluation of the stability of surrounding rock and for the design of tunnel support. In this paper, based on results of acoustic test during construction of underground powerhouse of Baihetan hydropower station, the relationship among rock relaxation, excavation depth and time is analyzed to provide basis for excavation and design of support.

Key words: rock relaxation, underground powerhouse, acoustic test