Rock mechanics in the investigation and construction of Tumut 1 Underground Power Station, Snowy Mountains, Australia
![Plate 5 – Geological Structures](/images/written_works/rock_mechanics/plate-5.jpg)
Plate 5. – Geological Structures
- Machine-hall excavation, with minor fault A cutting across roof of the pilot tunnel.
- Spalling granite in the wall of crosscut between the pilot tunnel and abutment drive.
- Downstream wall of the machine hall. Granite mostly broken along fresh fractures A persistent joint of set b forms the flat face.
- Penstock tunnel, showing gently dipping presistent fracture zone D and steeply dipping joints of set b