Abstract
The rock mass surrounding the 240 level of Canada`s Underground Research Laboratory (URL) has been hydrogeologically characterized through observations made in the tunnel and room excavations and from a network of radiating low-dipping boreholes. The 240 level complex sits in a wedge of grey-to-pink granite between two important, low-dipping, hydraulically active fracture zones, known as Fracture Zone 2 (FZ2) and Fracture Zone 2.5 (FZ2.5), a splay of FZ2. There is no apparent seepage into the 240 level room and tunnel network from the surrounding rock mass except from a vertical fracture intersected by the Room 209 tunnel. Extensive hydraulic and geomechanical tests have been conducted in boreholes intersecting the Room 209 vertical fracture, and transmissivities were found to range from 10{sup -10} to 10 {sup -6} m{sup 2}/s. FZ2 and FZ2.5 occur at the 240 m depth approximately 10 m to the west and 100 m to the south respectively of the 240 level tunnel network. Hydraulic testing within packer-isolated boreholes intersecting these fracture zones showed that transmissivities ranged from 10{sup -7} to 10{sup -5} m{sup 2}/s in FZ2, and 10{sup -9} to 10{sup -7} m{sup 2}/s in FZ2.5. No naturally-occurring fractures were encountered east of the 240 level complex
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Citation Formats
Kozak, E T, and Davison, C C.
Hydrogeology of the rock mass encountered at the 240 level of Canada`s Underground Research Laboratory.
Canada: N. p.,
1992.
Web.
Kozak, E T, & Davison, C C.
Hydrogeology of the rock mass encountered at the 240 level of Canada`s Underground Research Laboratory.
Canada.
Kozak, E T, and Davison, C C.
1992.
"Hydrogeology of the rock mass encountered at the 240 level of Canada`s Underground Research Laboratory."
Canada.
@misc{etde_10126974,
title = {Hydrogeology of the rock mass encountered at the 240 level of Canada`s Underground Research Laboratory}
author = {Kozak, E T, and Davison, C C}
abstractNote = {The rock mass surrounding the 240 level of Canada`s Underground Research Laboratory (URL) has been hydrogeologically characterized through observations made in the tunnel and room excavations and from a network of radiating low-dipping boreholes. The 240 level complex sits in a wedge of grey-to-pink granite between two important, low-dipping, hydraulically active fracture zones, known as Fracture Zone 2 (FZ2) and Fracture Zone 2.5 (FZ2.5), a splay of FZ2. There is no apparent seepage into the 240 level room and tunnel network from the surrounding rock mass except from a vertical fracture intersected by the Room 209 tunnel. Extensive hydraulic and geomechanical tests have been conducted in boreholes intersecting the Room 209 vertical fracture, and transmissivities were found to range from 10{sup -10} to 10 {sup -6} m{sup 2}/s. FZ2 and FZ2.5 occur at the 240 m depth approximately 10 m to the west and 100 m to the south respectively of the 240 level tunnel network. Hydraulic testing within packer-isolated boreholes intersecting these fracture zones showed that transmissivities ranged from 10{sup -7} to 10{sup -5} m{sup 2}/s in FZ2, and 10{sup -9} to 10{sup -7} m{sup 2}/s in FZ2.5. No naturally-occurring fractures were encountered east of the 240 level complex up to 300 m away. The rock mass to the north of the 240 level is dominated by the Room 209 vertical fracture, which tends to splay with distance and has been intersected 95 m from the Room 209 tunnel. (Author) (50 figs., 5 tabs., 10 refs.).}
place = {Canada}
year = {1992}
month = {Sep}
}
title = {Hydrogeology of the rock mass encountered at the 240 level of Canada`s Underground Research Laboratory}
author = {Kozak, E T, and Davison, C C}
abstractNote = {The rock mass surrounding the 240 level of Canada`s Underground Research Laboratory (URL) has been hydrogeologically characterized through observations made in the tunnel and room excavations and from a network of radiating low-dipping boreholes. The 240 level complex sits in a wedge of grey-to-pink granite between two important, low-dipping, hydraulically active fracture zones, known as Fracture Zone 2 (FZ2) and Fracture Zone 2.5 (FZ2.5), a splay of FZ2. There is no apparent seepage into the 240 level room and tunnel network from the surrounding rock mass except from a vertical fracture intersected by the Room 209 tunnel. Extensive hydraulic and geomechanical tests have been conducted in boreholes intersecting the Room 209 vertical fracture, and transmissivities were found to range from 10{sup -10} to 10 {sup -6} m{sup 2}/s. FZ2 and FZ2.5 occur at the 240 m depth approximately 10 m to the west and 100 m to the south respectively of the 240 level tunnel network. Hydraulic testing within packer-isolated boreholes intersecting these fracture zones showed that transmissivities ranged from 10{sup -7} to 10{sup -5} m{sup 2}/s in FZ2, and 10{sup -9} to 10{sup -7} m{sup 2}/s in FZ2.5. No naturally-occurring fractures were encountered east of the 240 level complex up to 300 m away. The rock mass to the north of the 240 level is dominated by the Room 209 vertical fracture, which tends to splay with distance and has been intersected 95 m from the Room 209 tunnel. (Author) (50 figs., 5 tabs., 10 refs.).}
place = {Canada}
year = {1992}
month = {Sep}
}