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Delineation of the disturbed rock zone surrounding excavations in salt
125A rock salt layers for waste disposal has been investigated. Engineering properties, technology of underground waste disposal, and engineering geological considerations are discussed.
depth l-5m was found. Desaturation and microfracturing were observed. Dilation following microfracturing is a component of closure.
Radioactive waste disposal
902490 Evaluation of the scale and consequences of excavation effects on the geological environment (In French) Devillers, C; Escalier des Orres, P; Hoorelbeke, J M
See also: 902020
9O2486 Problems of underground disposal of waste IAEG Commission No 14
lnt Assoc Engng Geol Bull N39, April 1989, P3-24 The work of the commission over 15 years is summarised. Principles are discussed and the main disposal methods and where they may be applied are described. Objectives of underground disposal and how they may be achieved are examined, including safety aspects. Evaluation of barrier efficiency, hydrogeological considerations, site characterisation, and safety analysis from the geotechnical stability viewpoint are addressed. Site specific engineering geological problems for individual projects are discussed, including system, rock mechanical and geological restrictions. 902487 Different subsurface facilities for geological disposal of radioactive waste (storage cycle) in Sweden Morfeldt, C O Int Assoc Engng Geol Bull N39. April 1989, P25-33 Sweden is one of the first countries to have a complete plan for radioactive waste handling and disposal. The primary host rocks considered for repository location are described. Small scale and full scale testing and study have been undertaken at the Stripa Mine Research Facility. Design concepts for the storage of high level and long life waste are illustrated. Procedures adopted for site selection, characterisation, and modelling of repository behaviour are outlined. 902488 Underground disposal of high-level radioactive waste in the United States of America - program overview Eriksson, L F Int Assoc Engng Geol Bull N39, April 1989, P35-51 The technical and administrative problems of the Office of Civilian Radioactive Waste Management (OCRWM) are summarised. Terms of reference are defined and the background outlined. The Yucca Mountain site in welded tuff is described in some detail, and the proposed exploratory shaft layout illustrated. Pending activities, problems, and potential solutions are discussed. 902489 Delineation of the disturbed rock zone surrounding excavations in salt Borns, D J; Stormont, J C
Rock Mechanics as a Guide for Elffcient Utilization of Natural Resource,: Proc 30th U.S. Symposium, Morgantown, 19-22 June 1989 P353-360. Publ Rotterdam: A A Balkema, 1989 The Disturbed Rock Zone, the zone in which mechanical and hydrological properties have changed in response to excavation, has been studied at the Waste Isolation Pilot Plant, New Mexico, USA. Electromagnetic methods (resistivity, in-mine direct current), seismic tomography and refraction, gas flow testing, and brine injection testing were used. A DRZ extending laterally throughout the excavation and varying in
Proc NEA Workshop on Excavation Response in Geological Repositories for Radioactive Waste, Winnipeg, 26-28 April 1988 P131-142. Publ France: OECD. 1989 An overview of the damage caused to rock by the construction of repositories is presented. Excavation effects, considering method of excavation, blasting effects, effects of mechanical excavation and stress redistribution, are discussed. Thermomechanical effects are outlined. The influence of the excavation on water flow in the surrounding rocks is examined using hydraulic simulations. 902491 Alteration of the conductivity of rock from excavations as indicated by the Stripa plugging and backfilling tests Pusch, R; Bergstrom, A
Proc NEA Workshop on Excavation Response in Geological Repositories for Radioactive Waste, Winnipeg, 26-28 April 1988 P143-156. Publ France: OECD, 1989 Experiments were carried out at the Stripa mine to study the effect of excavation on hydraulic conductivity and whether plugging could alleviate the problem. A buffer mass test was used to assess the altered hydraulic conductivity due to excavation of a drift in granite. This showed that hydraulic conductivity increased in the axial direction of the excavation. A shaft plugging test was carried out and showed that some major fractures widened by blasting or stress relief formed a disturbed zone with significant axial hydraulic conductivity. Plugging with Na bentonite blocked the flow. A tunnel plugging test indicated that even careful blasting induces fissures, and strategic location of plugs and grouting can create a stagnant water regime in the repository. 902492 Thermal/mechanical analyses of G-tunnel field experiments at Rainier Mesa,Nevada Bauer, S J; Costin, L S; Chen, E P; Tillerson, J R
Proc NEA Workshop on Excavation Response in Geological Repositories for Radioactive Waste, Winnipeg, 26-28 April 1988 P187-206. Publ France: OECD, 1989 Analytical models have been used to interpret data from a test drift in welded and nonwelded tuff, taken during experiments to study thermal and mechanical behaviour. The tests analysed are in situ stress measurements, small diameter heater experiments and mining evaluation. These results have been used in further analysis to design experiments for an exploratory shaft facility at Yucca Mountain. The shaft convergence test and demonstration breakout rooms analyses are described.
Underground construction methods 902493 New Pre-metro line for Amsterdam? Van Lohuizen, H P S
Tunnlg Underground Space Technol V4, N3, 1989, P285-291 The geology of Amsterdam is layers of sands with interlayer peat and clay,and surface layers of sand fill over peat. In areas under the river IJ deep channels have been filled with very soft silts. Three tunnelling options are compared on economic and
© 1990 Pergamon Press plc. Reproduction not permitted
depth l-5m was found. Desaturation and microfracturing were observed. Dilation following microfracturing is a component of closure.
Radioactive waste disposal
902490 Evaluation of the scale and consequences of excavation effects on the geological environment (In French) Devillers, C; Escalier des Orres, P; Hoorelbeke, J M
See also: 902020
9O2486 Problems of underground disposal of waste IAEG Commission No 14
lnt Assoc Engng Geol Bull N39, April 1989, P3-24 The work of the commission over 15 years is summarised. Principles are discussed and the main disposal methods and where they may be applied are described. Objectives of underground disposal and how they may be achieved are examined, including safety aspects. Evaluation of barrier efficiency, hydrogeological considerations, site characterisation, and safety analysis from the geotechnical stability viewpoint are addressed. Site specific engineering geological problems for individual projects are discussed, including system, rock mechanical and geological restrictions. 902487 Different subsurface facilities for geological disposal of radioactive waste (storage cycle) in Sweden Morfeldt, C O Int Assoc Engng Geol Bull N39. April 1989, P25-33 Sweden is one of the first countries to have a complete plan for radioactive waste handling and disposal. The primary host rocks considered for repository location are described. Small scale and full scale testing and study have been undertaken at the Stripa Mine Research Facility. Design concepts for the storage of high level and long life waste are illustrated. Procedures adopted for site selection, characterisation, and modelling of repository behaviour are outlined. 902488 Underground disposal of high-level radioactive waste in the United States of America - program overview Eriksson, L F Int Assoc Engng Geol Bull N39, April 1989, P35-51 The technical and administrative problems of the Office of Civilian Radioactive Waste Management (OCRWM) are summarised. Terms of reference are defined and the background outlined. The Yucca Mountain site in welded tuff is described in some detail, and the proposed exploratory shaft layout illustrated. Pending activities, problems, and potential solutions are discussed. 902489 Delineation of the disturbed rock zone surrounding excavations in salt Borns, D J; Stormont, J C
Rock Mechanics as a Guide for Elffcient Utilization of Natural Resource,: Proc 30th U.S. Symposium, Morgantown, 19-22 June 1989 P353-360. Publ Rotterdam: A A Balkema, 1989 The Disturbed Rock Zone, the zone in which mechanical and hydrological properties have changed in response to excavation, has been studied at the Waste Isolation Pilot Plant, New Mexico, USA. Electromagnetic methods (resistivity, in-mine direct current), seismic tomography and refraction, gas flow testing, and brine injection testing were used. A DRZ extending laterally throughout the excavation and varying in
Proc NEA Workshop on Excavation Response in Geological Repositories for Radioactive Waste, Winnipeg, 26-28 April 1988 P131-142. Publ France: OECD. 1989 An overview of the damage caused to rock by the construction of repositories is presented. Excavation effects, considering method of excavation, blasting effects, effects of mechanical excavation and stress redistribution, are discussed. Thermomechanical effects are outlined. The influence of the excavation on water flow in the surrounding rocks is examined using hydraulic simulations. 902491 Alteration of the conductivity of rock from excavations as indicated by the Stripa plugging and backfilling tests Pusch, R; Bergstrom, A
Proc NEA Workshop on Excavation Response in Geological Repositories for Radioactive Waste, Winnipeg, 26-28 April 1988 P143-156. Publ France: OECD, 1989 Experiments were carried out at the Stripa mine to study the effect of excavation on hydraulic conductivity and whether plugging could alleviate the problem. A buffer mass test was used to assess the altered hydraulic conductivity due to excavation of a drift in granite. This showed that hydraulic conductivity increased in the axial direction of the excavation. A shaft plugging test was carried out and showed that some major fractures widened by blasting or stress relief formed a disturbed zone with significant axial hydraulic conductivity. Plugging with Na bentonite blocked the flow. A tunnel plugging test indicated that even careful blasting induces fissures, and strategic location of plugs and grouting can create a stagnant water regime in the repository. 902492 Thermal/mechanical analyses of G-tunnel field experiments at Rainier Mesa,Nevada Bauer, S J; Costin, L S; Chen, E P; Tillerson, J R
Proc NEA Workshop on Excavation Response in Geological Repositories for Radioactive Waste, Winnipeg, 26-28 April 1988 P187-206. Publ France: OECD, 1989 Analytical models have been used to interpret data from a test drift in welded and nonwelded tuff, taken during experiments to study thermal and mechanical behaviour. The tests analysed are in situ stress measurements, small diameter heater experiments and mining evaluation. These results have been used in further analysis to design experiments for an exploratory shaft facility at Yucca Mountain. The shaft convergence test and demonstration breakout rooms analyses are described.
Underground construction methods 902493 New Pre-metro line for Amsterdam? Van Lohuizen, H P S
Tunnlg Underground Space Technol V4, N3, 1989, P285-291 The geology of Amsterdam is layers of sands with interlayer peat and clay,and surface layers of sand fill over peat. In areas under the river IJ deep channels have been filled with very soft silts. Three tunnelling options are compared on economic and
© 1990 Pergamon Press plc. Reproduction not permitted