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ZEDEX - A study of damage and disturbance from tunnel excavation by blasting and tunnel boring

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
Authors:
Emsley, S; [1]  Olsson, Olle; Stenberg, L; [2]  Alheid, H J; [3]  Falls, S [4] 
  1. Golder Associates, Maidenhead (United Kingdom)
  2. Swedish Nuclear Fuel and Waste Co., Figeholm (Sweden)
  3. Federal Inst. for Geosciences and Natural Resources, Hannover (Germany)
  4. Queens Univ., Kingston, ON (Canada)
Publication Date:
Dec 01, 1997
Product Type:
Technical Report
Report Number:
SKB-TR-97-30
Reference Number:
SCA: 052002; 540250; PA: AIX-29:050588; EDB-98:092434; SN: 98002007561
Resource Relation:
Other Information: DN: 68 refs, 92 figs, 31 tabs; PBD: Dec 1997
Subject:
05 NUCLEAR FUELS; 54 ENVIRONMENTAL SCIENCES; BOREHOLES; EXCAVATION; EXPLOSIONS; HYDRAULIC CONDUCTIVITY; RADIOACTIVE WASTE DISPOSAL; ROCK MECHANICS; TUNNELING; UNDERGROUND DISPOSAL
OSTI ID:
644116
Research Organizations:
Swedish Nuclear Fuel and Waste Management Co., Stockholm (Sweden); Agence National pour la Gestion des Dechets Radioactifs (France); United Kingdom Nirex Ltd., Harwell (United Kingdom)
Country of Origin:
Sweden
Language:
English
Other Identifying Numbers:
Other: ON: DE98636156; TRN: SE9800221050588
Availability:
INIS; OSTI as DE98636156
Submitting Site:
SWDN
Size:
221 p.
Announcement Date:
Sep 30, 1998

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}
}