Abstract
The objectives of the ZEDEX project were to understand the mechanical behaviour of the excavation disturbed zone (EDZ) with respect to its origin, character, magnitude of property change, extent and its dependence on excavation method. Excavation with normal smooth blasting, blasting with low shock explosives and tunnel boring were studied. The drifts are located at Aespoe at a depth of 420 m, the profiles are circular and 5 m in diameter. The results have shown that there is a damaged zone, close to the drift wall dominated by changes in rock properties which are irreversible, and that there is a disturbed zone beyond the damaged zone that is dominated by changes in stress state and mainly reversible. There is no distinct boundary between the two zones. The results from ZEDEX indicate that the role of the EDZ as a preferential pathway to radionuclide transport is limited to the damaged zone. The extent of the damaged zone can be limited through application of appropriate excavation methods. By limiting the extent of the damaged zone it should also be feasible to block pathways in the damaged zone by plugs placed at strategic locations 68 refs, 92 figs, 31 tabs
Emsley, S;
[1]
Olsson, Olle;
Stenberg, L;
[2]
Alheid, H J;
[3]
Falls, S
[4]
- Golder Associates, Maidenhead (United Kingdom)
- Swedish Nuclear Fuel and Waste Co., Figeholm (Sweden)
- Federal Inst. for Geosciences and Natural Resources, Hannover (Germany)
- Queens Univ., Kingston, ON (Canada)
Citation Formats
Emsley, S, Olsson, Olle, Stenberg, L, Alheid, H J, and Falls, S.
ZEDEX - A study of damage and disturbance from tunnel excavation by blasting and tunnel boring.
Sweden: N. p.,
1997.
Web.
Emsley, S, Olsson, Olle, Stenberg, L, Alheid, H J, & Falls, S.
ZEDEX - A study of damage and disturbance from tunnel excavation by blasting and tunnel boring.
Sweden.
Emsley, S, Olsson, Olle, Stenberg, L, Alheid, H J, and Falls, S.
1997.
"ZEDEX - A study of damage and disturbance from tunnel excavation by blasting and tunnel boring."
Sweden.
@misc{etde_644116,
title = {ZEDEX - A study of damage and disturbance from tunnel excavation by blasting and tunnel boring}
author = {Emsley, S, Olsson, Olle, Stenberg, L, Alheid, H J, and Falls, S}
abstractNote = {The objectives of the ZEDEX project were to understand the mechanical behaviour of the excavation disturbed zone (EDZ) with respect to its origin, character, magnitude of property change, extent and its dependence on excavation method. Excavation with normal smooth blasting, blasting with low shock explosives and tunnel boring were studied. The drifts are located at Aespoe at a depth of 420 m, the profiles are circular and 5 m in diameter. The results have shown that there is a damaged zone, close to the drift wall dominated by changes in rock properties which are irreversible, and that there is a disturbed zone beyond the damaged zone that is dominated by changes in stress state and mainly reversible. There is no distinct boundary between the two zones. The results from ZEDEX indicate that the role of the EDZ as a preferential pathway to radionuclide transport is limited to the damaged zone. The extent of the damaged zone can be limited through application of appropriate excavation methods. By limiting the extent of the damaged zone it should also be feasible to block pathways in the damaged zone by plugs placed at strategic locations 68 refs, 92 figs, 31 tabs}
place = {Sweden}
year = {1997}
month = {Dec}
}
title = {ZEDEX - A study of damage and disturbance from tunnel excavation by blasting and tunnel boring}
author = {Emsley, S, Olsson, Olle, Stenberg, L, Alheid, H J, and Falls, S}
abstractNote = {The objectives of the ZEDEX project were to understand the mechanical behaviour of the excavation disturbed zone (EDZ) with respect to its origin, character, magnitude of property change, extent and its dependence on excavation method. Excavation with normal smooth blasting, blasting with low shock explosives and tunnel boring were studied. The drifts are located at Aespoe at a depth of 420 m, the profiles are circular and 5 m in diameter. The results have shown that there is a damaged zone, close to the drift wall dominated by changes in rock properties which are irreversible, and that there is a disturbed zone beyond the damaged zone that is dominated by changes in stress state and mainly reversible. There is no distinct boundary between the two zones. The results from ZEDEX indicate that the role of the EDZ as a preferential pathway to radionuclide transport is limited to the damaged zone. The extent of the damaged zone can be limited through application of appropriate excavation methods. By limiting the extent of the damaged zone it should also be feasible to block pathways in the damaged zone by plugs placed at strategic locations 68 refs, 92 figs, 31 tabs}
place = {Sweden}
year = {1997}
month = {Dec}
}