- Email: [email protected]
Study on earthquake resistance of large underground caverns
204A has been used successfully in Italy in cohesive and semi-cohesive soils. Wet shotcrete was used to reduce dust problems. Development of the high strength, fast hardening fibre reinforced shotcrete mix for this special application is described.
933503 Rockburet menitoring in the Corer D'Alene district: a progress report Sprenke, K F; Hoskins, J R; Jung, S S; Dodge, D A
Groundwater problems
Proc 9th A n n u l Workskop Gesaric Mineral T e ~ Center Mine Systems Design asd Gromul Comral, Lexiqton, 10-12 November, 1991 P69-72. Publ Blacksburg: Virginia Polytechnic Institute and State University, 1991
93350O DEM ~ n ~ of water flow in jointed recks Wei, L; Hudson, J A
Proc 7th I S R M Interutiomd Congress on Rock Mechanics, Aachen, 1620 September 1991 V1, P823-826. Publ Rotterdam: A A Balkema, 1991 The Discrete Element Method is used to examine the influence of excavation-induced stresses on water flow around an underground opening in a jointed rock mass. The static relaxation scheme of Stewart (1982) is used, which allows easy coupling of water flows and does not require time steps. It cannot, however, handle large displacements or rotations. Intact rock blocks are taken to be rigid and impermeable. Results are presented for the steady state case.
Surface subsidence, caving and rockbursts 933501 Seismic characterization of a highly stressed rock mass using tomographic imaging and induced seismieity Young, R P; Maxwell, S C
J Geopkys Res V97, NB9, Aug 1992, P12361-12373 A seismic tomography study was carried out at the Lockerby Mine, Sudbury, to determine the integrity of the rock at depth lkm and to investigate correlation between induced seismicity and P wave velocity structures. Two distinct velocity anomalies associated with past seismicity were found. These were subsequently diamond drilled for samples to verify their physical characteristics. The high velocity zone showed disking on coring, indicating high in situ stress and potential for further seismicity. The low velocity zone was extensively fractured and seismic risk in the future is considered small. 933502 Settlement caused by blind shield tunnelling through Talpei silt Fang, Y S; Pan, M D; Lin, G J
Tann Tunnig V24, Nil, Nov 1992, P22-24 Development of Taipei requires tunnels for sewers and transport systems. Shield tunnelling is adopted in heavily trafficked commercial areas. The ground is mainly clayey silt, with silty clay and sandy silt. Settlement due to 5m diameter blind shield tunnelling at shallow (less than 10m) depth has been monitored. Settlement profiles, which are closely reproduced by the error function, are illustrated. Initial ground heave of about 3mm was followed by ground subsidence with a maximum of 65mm, most of which occurred in the first 4 days. The settlement curves of Peck (1969) do not satisfactorily predict the settlement trough width.
The Coeur D'Alene district near the Idaho-Montana border is one of the few metal mining areas of the USA to suffer severe rock burst problems. Events have become more frequent as mining enters deeper, brittle rock. Regional seismicity is reviewed, including a tectonic earthquake in 1988, and observed frequency-magnitude relations discussed. Districtwide monitoring using portable seismographs and the proposed permanent network are described. Rock mechanics studies to identify potential fault slip planes so extraction can be planned to minimise stress build-up are ongoing.
Influence of dynamic loads 933504 Study on earthquake resistance of large underground caverns Komada, H
In: Rock Mechanics in Japan, Volume VI P120-124. Publ Tokyo." Japanese Committee for ISRM, 1991 Response of existing underground structures in Japan to seismic events has been studied with a view to improving design of nuclear power plants or waste repositories. Accelerations recorded at cavern bottoms and walls and at the ground surface and the response spectra underground and at the surface have been compared. Deep structures show lower accelerations, making them potentially more stable than surface facilities. Dynamic analysis of a proposed plant has indicated the dimensions of the loosened zone during construction and seismic excitation. Support can be planned to maintain adequate factors of safety. 933505 Sbmklng table tests of submerged tunnel in sandy grmmd Nakata, H; Miyake, K; Muraoka, T
Proc International Conference on Geoteclmical FAqgineering for Coastal De~iolmem, GEO-COAST'91, Yokalmma, 3-6 September 1991 1)483-486. Publ Japan: Coastal Development Institute of Technology, 1991 A tunnel is planned beneath the Shinano river at the port of Niigata, Japan. The site is of relatively loose sandy soil and it is expected that an earthquake of magnitude similar to that of 1984 would cause liquefaction to a depth of about 15m. Preventative measures against liquefaction are particularly important for the onshore sections and the ventilation towers. Shaking table tests have been carried out to determine the dimensions of the volume around the structure to be improved by soil compaction and drainage to prevent flotation of the submerged structure.
© 1993 Pergamon Press Ltd. Reproduction not permitted
933503 Rockburet menitoring in the Corer D'Alene district: a progress report Sprenke, K F; Hoskins, J R; Jung, S S; Dodge, D A
Groundwater problems
Proc 9th A n n u l Workskop Gesaric Mineral T e ~ Center Mine Systems Design asd Gromul Comral, Lexiqton, 10-12 November, 1991 P69-72. Publ Blacksburg: Virginia Polytechnic Institute and State University, 1991
93350O DEM ~ n ~ of water flow in jointed recks Wei, L; Hudson, J A
Proc 7th I S R M Interutiomd Congress on Rock Mechanics, Aachen, 1620 September 1991 V1, P823-826. Publ Rotterdam: A A Balkema, 1991 The Discrete Element Method is used to examine the influence of excavation-induced stresses on water flow around an underground opening in a jointed rock mass. The static relaxation scheme of Stewart (1982) is used, which allows easy coupling of water flows and does not require time steps. It cannot, however, handle large displacements or rotations. Intact rock blocks are taken to be rigid and impermeable. Results are presented for the steady state case.
Surface subsidence, caving and rockbursts 933501 Seismic characterization of a highly stressed rock mass using tomographic imaging and induced seismieity Young, R P; Maxwell, S C
J Geopkys Res V97, NB9, Aug 1992, P12361-12373 A seismic tomography study was carried out at the Lockerby Mine, Sudbury, to determine the integrity of the rock at depth lkm and to investigate correlation between induced seismicity and P wave velocity structures. Two distinct velocity anomalies associated with past seismicity were found. These were subsequently diamond drilled for samples to verify their physical characteristics. The high velocity zone showed disking on coring, indicating high in situ stress and potential for further seismicity. The low velocity zone was extensively fractured and seismic risk in the future is considered small. 933502 Settlement caused by blind shield tunnelling through Talpei silt Fang, Y S; Pan, M D; Lin, G J
Tann Tunnig V24, Nil, Nov 1992, P22-24 Development of Taipei requires tunnels for sewers and transport systems. Shield tunnelling is adopted in heavily trafficked commercial areas. The ground is mainly clayey silt, with silty clay and sandy silt. Settlement due to 5m diameter blind shield tunnelling at shallow (less than 10m) depth has been monitored. Settlement profiles, which are closely reproduced by the error function, are illustrated. Initial ground heave of about 3mm was followed by ground subsidence with a maximum of 65mm, most of which occurred in the first 4 days. The settlement curves of Peck (1969) do not satisfactorily predict the settlement trough width.
The Coeur D'Alene district near the Idaho-Montana border is one of the few metal mining areas of the USA to suffer severe rock burst problems. Events have become more frequent as mining enters deeper, brittle rock. Regional seismicity is reviewed, including a tectonic earthquake in 1988, and observed frequency-magnitude relations discussed. Districtwide monitoring using portable seismographs and the proposed permanent network are described. Rock mechanics studies to identify potential fault slip planes so extraction can be planned to minimise stress build-up are ongoing.
Influence of dynamic loads 933504 Study on earthquake resistance of large underground caverns Komada, H
In: Rock Mechanics in Japan, Volume VI P120-124. Publ Tokyo." Japanese Committee for ISRM, 1991 Response of existing underground structures in Japan to seismic events has been studied with a view to improving design of nuclear power plants or waste repositories. Accelerations recorded at cavern bottoms and walls and at the ground surface and the response spectra underground and at the surface have been compared. Deep structures show lower accelerations, making them potentially more stable than surface facilities. Dynamic analysis of a proposed plant has indicated the dimensions of the loosened zone during construction and seismic excitation. Support can be planned to maintain adequate factors of safety. 933505 Sbmklng table tests of submerged tunnel in sandy grmmd Nakata, H; Miyake, K; Muraoka, T
Proc International Conference on Geoteclmical FAqgineering for Coastal De~iolmem, GEO-COAST'91, Yokalmma, 3-6 September 1991 1)483-486. Publ Japan: Coastal Development Institute of Technology, 1991 A tunnel is planned beneath the Shinano river at the port of Niigata, Japan. The site is of relatively loose sandy soil and it is expected that an earthquake of magnitude similar to that of 1984 would cause liquefaction to a depth of about 15m. Preventative measures against liquefaction are particularly important for the onshore sections and the ventilation towers. Shaking table tests have been carried out to determine the dimensions of the volume around the structure to be improved by soil compaction and drainage to prevent flotation of the submerged structure.
© 1993 Pergamon Press Ltd. Reproduction not permitted