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
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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