Advances in Civil Engineering / 2020 / Article / Fig 7

Research Article

Assessment of the Excavation Damaged Zones in the Surrounding Rock of an Underground Powerhouse under High In Situ Stress Using an Acoustic Velocity Detecting Method

Figure 7

The high stress phenomena in the underground powerhouse: (a) the irregular lamps cake core, (b) rock mass splitting and spalling occurring at the 2nd-layer drainage gallery, and (c) roof collapse induced by rock burst in No. 2 tailrace tunnel in the underground powerhouse.

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