Rock Spalling In Tunnels
Rock Spalling In Tunnels
(OP)
Anyone familiar with this subject?
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RE: Rock Spalling In Tunnels
Intrusion Prepakt /marineconcrete.com
RE: Rock Spalling In Tunnels
RE: Rock Spalling In Tunnels
If you have extensive fractured rock one possible solution is to drill ahead of excavation 10 , 20 or 30 meters in a cone shape. Inject the proper grout and turn your fractured rock in Prepakt concrete . This would provide you with an area to cut through that would be stable as the surrounding rock/concrete would form an arch.
This technique injecting grout into stone from sized from 1" to mansize is used in Mining,To construct reactor cradels and to make radiation shielding.It provides similar strenghts to normal concrete mixes.
Grouts are available with very high adhesive qualities.
Prepakt suppied the grouts for the repairs and resurfacing of the spillways on the Hoover Dam and to anchor the mast on the CN tower,
What you would need is a grout with both good permeation qualities and high adhesion. It may be available off the shelf or may need to be designed.
As for what Intrusion prepakt actually does we do both construction and supply engineering specs mostly of a very specialist nature. ( reactor and marine constuction)
Intrusion Prepakt /marineconcrete.com
RE: Rock Spalling In Tunnels
Reports from the Vancouver tunnel referred to, do not meet this definition. There it would appear large volumes of rock fell into the the excavation before ground support could be installed and depth is almost certainly only a few hundered metres maximum. stress levels were almost certainly low, it would have been geological weaknesses that probably initiated this.
RE: Rock Spalling In Tunnels
RE: Rock Spalling In Tunnels