Advances in Civil Engineering / 2020 / Article / Fig 14

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 14

Excavation damaged zones (EDZs) along the depth of the rock mass surrounding the Houziyan main powerhouse: (a) a typical account of the acoustic wave velocity in the surrounding rock mass, (b) a typical account of a borehole TV of fractures in the surrounding rock mass, and (c) corresponding D curves and classification of EDZs in the testing borehole.

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