Rock physical interpretation of the seismic properties of the excavation disturbed zone

2013 ◽  
pp. 161-164
Author(s):  
T Takahashi ◽  
S Tanaka
Keyword(s):  
Physical Interpretation ◽  
Seismic Properties ◽  
Disturbed Zone ◽  
Excavation Disturbed Zone

Determination of the Porosity, Permeability and Diffusivity of Rock in the Excavation-Disturbed Zone Around Full-Scale Deposition Holes Using the He-Gas Method

1999 ◽  
Vol 556 ◽  
Author(s):  
J. Autio ◽  
J. Timonen ◽  
T. Aaltonen ◽  
M. Laajalahti ◽  
K. Kuoppamäki ◽  
...  
Keyword(s):  
Nuclear Waste ◽  
Granitic Rock ◽  
Nuclear Waste Repository ◽  
Direction Parallel ◽  
Disturbed Zone ◽  
Excavation Disturbed Zone ◽  
Waste Repository ◽  
Effective Diffusivities ◽  
Scale Deposition

AbstractIn a nuclear waste repository, rock in the excavation-disturbed zone adjacent to the walls of deposition holes for waste canisters is a potential pathway for the transport of corrosive agents and radionuclides. Three experimental holes the size of deposition holes in a KBS-3 type repository (depth 7.5 m and diameter 1.5 m) were bored in hard granitic rock in the Research Tunnel at Olkiluoto and the porosities, effective diffusivities and permeabilities of rock in the excavation-disturbed zone were determined in a direction parallel to the disturbed surface using He-gas methods. Permeability and diffusivity in a direction parallel to the rock schistosity was found to be clearly larger than in a direction perpendicular to it.

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