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Excavation and support optimisation for a large underground storage facility in weak jointed chalk
264A 934450 Long-term evaluation of underground stress control at the Sifto salt mine Dickie, D E; Serata, S Min Engng V45, N1, Jan 1993, P54-57 The stress control method of mining has now replaced conventional room and pillar working at the Sifto mine, Ontario. Extraction ratio has increased from 38 to 50%, while ground control and rehabilitation costs have fallen by over 80%. Roof problem history is outlined. The principles of the stress control method are presented: using natural forces to form a protective stress arch rather than applying artificial support. Adaptation and basic testing of the method, including finite element modelling, and transition to production are described.
934451 Design of support systems - a methodical approach Ghose, A K; Ghosh, C N Proc International Symposium on Rock Support, Sndbnry, 1619 June 1992 P43-47. Publ Rotterdam: A A Balkema, 1992 Rock pressure distributions and strata deformation at the extraction perimeters have been measured in several Indian bord and pillar coal mines. Using this information, an observational support design approach has been developed. Maximum convergence and rock load can be estimated in terms of Bieniawski's R M R value, roadway span, and dry density of the rock. A case history example is presented.
General underground storage 934452 Development of a regulatory framework for the use of underground space in Hong Kong Howells, D J; Chan, T C F Tunnlg Underground Space Techaol V8, NI, Jan 1993, P3740
Scarcity of land and suitable rock conditions make underground development of Hong Kong attractive. To promote use of underground space and ensure a systematic and consistent approach to development, a regulatory framework is needed. The Geotechnical Engineering Office published Geoguide 4: Guide to Cavern Engineering, in 1992. The four main sections of this guide are summarised: site investigation; cavern design; cavern construction; and monitoring.
934454 Excavation and support optimisation for a large underground storage facility in weak jointed chalk Barla, G; Sharp, J C; Rabagliati, U Proc 7th I S R M International Congress on Rock Mechanics, Aachen, 16-20 September 1991 V2, P1067-1072. Publ Rotterdam: A A Balkema, 1991
An oil storage facility comprising 2 large lined caverns (305m long, 14m maximum diameter) has been constructed in Israel. Excavation and support optimisation during excavation was practised, using geological and rock mass conditions determined during construction. In situ stresses were measured using special weak rock hydrofracturing equipment. Laboratory and field measured geotechnical properties were compared as excavation proceeded, as were predicted and observed cavern behaviour. After excavation of three zones of a cavern in sequence, optimum excavation and rock reinforcement arrangement were defined. 934455 Norwegian Olympic ice hockey cavern of 60m span Barton, N; Tunbridge, L; Loset, F; Westerdahl, H; Kristiansen, J; Vik, G; Chryssanthakis, P Proc 7tb I S R M International Congress on Rock Mechanics, Aachen, 16-20 September 1991 V2, P1073-1081. Publ Rotterdam." A A Balkema, 1991
The Gjovik cavern in jointed Precambrian gneiss with 25-50m cover has required careful design. Geotechnical investigations included geological and Q-system mapping in the vicinity and determination of Q, JRC, JCS, and friction angle from core samples. Horizontal in situ stresses were determined by hydrofracturing and joint jacking, and crosshole seismic tomography and large scale measurements of joint roughness have been carried out. UDEC-BB modelling has been used to check stability and help specify the rockbolt and fibre-reinforced shotcrete support. 934456 Performance of fully grouted rebar anchors and shotcrete in a 61m open span Mryvang, A; Stjern, G; Morseth, B Proc International Symposium on Rock Support, Sudbury, 1619 June 1992 Pl17-122. Publ Rotterdam: A A Balkema. 1992 The Gjovik cavern to house the 1994 Olympic icehockey has a span of 61m and length of 91m. Rock at the site is Precambrian gneiss. Roof support is 12m long fully grouted anchors in a 5m by 5m pattern interlaced with 6m fully grouted rebars in a similar grid, plus 100mm of fibre reinforced shotcrete. The Q system was the basis of roof support design. Roof movements have been monitored by extensometers and strain gauges attached to some rebars. Deformation is within the range predicted by numerical analysis. Most rebars carry only very low loads.
Radioactive waste disposal 934453 Prospects for rock caverns in Hong Kong Malone, A W Tunn Tunalg V25, N1, Jan 1993, P25-28
Much of Hong Kong is underlain by igneous rocks which, below their weathered mantle, are an excellent excavation medium. When very high land prices are also taken into account, utilisation of underground space becomes attractive. A number of existing and proposed underground construction projects are outlined, with details of pre-construction planning given. The current status of cavern usage in Hong Kong and future prospects are briefly discussed.
See also: 934113, 934125 934457
Modemng of rock mass response to glaciation at Finnsjon, Central Sweden Rosengren, L; Stephansson, O Tumdg Underground Space Techaoi II8, NI, Jan 1993, P7582
Future glaciation must be taken into account when analysing the safety of the Finnsjon HLW Repository in granite bedrock in Sweden. The passage and retreat of the ice sheet will impose
© 1993 Pergamon Press Ltd. Reproduction not permitted
934451 Design of support systems - a methodical approach Ghose, A K; Ghosh, C N Proc International Symposium on Rock Support, Sndbnry, 1619 June 1992 P43-47. Publ Rotterdam: A A Balkema, 1992 Rock pressure distributions and strata deformation at the extraction perimeters have been measured in several Indian bord and pillar coal mines. Using this information, an observational support design approach has been developed. Maximum convergence and rock load can be estimated in terms of Bieniawski's R M R value, roadway span, and dry density of the rock. A case history example is presented.
General underground storage 934452 Development of a regulatory framework for the use of underground space in Hong Kong Howells, D J; Chan, T C F Tunnlg Underground Space Techaol V8, NI, Jan 1993, P3740
Scarcity of land and suitable rock conditions make underground development of Hong Kong attractive. To promote use of underground space and ensure a systematic and consistent approach to development, a regulatory framework is needed. The Geotechnical Engineering Office published Geoguide 4: Guide to Cavern Engineering, in 1992. The four main sections of this guide are summarised: site investigation; cavern design; cavern construction; and monitoring.
934454 Excavation and support optimisation for a large underground storage facility in weak jointed chalk Barla, G; Sharp, J C; Rabagliati, U Proc 7th I S R M International Congress on Rock Mechanics, Aachen, 16-20 September 1991 V2, P1067-1072. Publ Rotterdam: A A Balkema, 1991
An oil storage facility comprising 2 large lined caverns (305m long, 14m maximum diameter) has been constructed in Israel. Excavation and support optimisation during excavation was practised, using geological and rock mass conditions determined during construction. In situ stresses were measured using special weak rock hydrofracturing equipment. Laboratory and field measured geotechnical properties were compared as excavation proceeded, as were predicted and observed cavern behaviour. After excavation of three zones of a cavern in sequence, optimum excavation and rock reinforcement arrangement were defined. 934455 Norwegian Olympic ice hockey cavern of 60m span Barton, N; Tunbridge, L; Loset, F; Westerdahl, H; Kristiansen, J; Vik, G; Chryssanthakis, P Proc 7tb I S R M International Congress on Rock Mechanics, Aachen, 16-20 September 1991 V2, P1073-1081. Publ Rotterdam." A A Balkema, 1991
The Gjovik cavern in jointed Precambrian gneiss with 25-50m cover has required careful design. Geotechnical investigations included geological and Q-system mapping in the vicinity and determination of Q, JRC, JCS, and friction angle from core samples. Horizontal in situ stresses were determined by hydrofracturing and joint jacking, and crosshole seismic tomography and large scale measurements of joint roughness have been carried out. UDEC-BB modelling has been used to check stability and help specify the rockbolt and fibre-reinforced shotcrete support. 934456 Performance of fully grouted rebar anchors and shotcrete in a 61m open span Mryvang, A; Stjern, G; Morseth, B Proc International Symposium on Rock Support, Sudbury, 1619 June 1992 Pl17-122. Publ Rotterdam: A A Balkema. 1992 The Gjovik cavern to house the 1994 Olympic icehockey has a span of 61m and length of 91m. Rock at the site is Precambrian gneiss. Roof support is 12m long fully grouted anchors in a 5m by 5m pattern interlaced with 6m fully grouted rebars in a similar grid, plus 100mm of fibre reinforced shotcrete. The Q system was the basis of roof support design. Roof movements have been monitored by extensometers and strain gauges attached to some rebars. Deformation is within the range predicted by numerical analysis. Most rebars carry only very low loads.
Radioactive waste disposal 934453 Prospects for rock caverns in Hong Kong Malone, A W Tunn Tunalg V25, N1, Jan 1993, P25-28
Much of Hong Kong is underlain by igneous rocks which, below their weathered mantle, are an excellent excavation medium. When very high land prices are also taken into account, utilisation of underground space becomes attractive. A number of existing and proposed underground construction projects are outlined, with details of pre-construction planning given. The current status of cavern usage in Hong Kong and future prospects are briefly discussed.
See also: 934113, 934125 934457
Modemng of rock mass response to glaciation at Finnsjon, Central Sweden Rosengren, L; Stephansson, O Tumdg Underground Space Techaoi II8, NI, Jan 1993, P7582
Future glaciation must be taken into account when analysing the safety of the Finnsjon HLW Repository in granite bedrock in Sweden. The passage and retreat of the ice sheet will impose
© 1993 Pergamon Press Ltd. Reproduction not permitted