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Geotechnical assessment of a power house cavity at Uri Hydel project, Kashmir Himalaya, India
265A 876401 Field measurements on the behavior of the rock surrounding an underground cavern during excavation Yoichi, H; Hasui, A; Yamashita, R
Power plants See also: 876101 876397 Tunnel plug design at Tyee Lake Cogan, J; Kintzer, F C
Bull Assoc Engng Geol V24, NI, Feb 1987, P27-42 Tunnel plugs isolate water under pressure from open parts of a tunnel. The plug must limit leakage and be designed so that applied loads do not damage the plug or the surrounding rock. General criteria for positioning a plug to avoid rock splitting are discussed. The problems, which increase for high head projects, are examined, and the sufficient cover criteria for unlined rock tunnels are reviewed. Reported plug failures and experiences at the Tyee Lake project are described. 876398 Limits for pressure tunnels without steel linings Blind, H; Schwarz, J Int Water Power Dam Constr V39, N7, July 1987, P51-54
Proc International Symposium on Large Rock Caverns, Helsinki, 25-28 August 1986 ~ , P1099-I l I0. Publ OxJbrd: Pergamon Press. 1986 Underground excavations cause damage and stress redistribution in surrounding rocks. During construction of an underground powerhouse in granite, seismic wave velocity and attenuation measurements, Lugeon tests,and convergence measurements were carried out. For rocks within 4m of the walls, permeability increased by 30 times or more, and seismic wave velocity and amplitude decreased by up to 30% and 90% respectively. Rock strains of 0.08-0.27% were recorded. At a distance of 7m from the sidewall, rock properties were unaffected. 876402 Rock mass monitoring of the Tabuaco hydraulic circuit Cunha, A P; Ferreira da Silva, A
Proc 5th International Congress International Association of Engineering Geology, Buenos Aires, 20-25 October 1986 V1, P187-192. Publ Rotterdam: A A Balkema, 1986
At the initial design stage of a project, only a little information concerning topography, rock mass .classification, and internal pressure is available. Simple static calculations give only an indication of whether an impervious steel lining is necessary. Data collected from over 200 tunnels has been analysed, and relations between rock cover, rock quality and load are presented. Conditions where concrete linings or no lining at all will suffice are evaluated.
Water inflow was found in galleries near the surge shaft of the Vilar-Tabuaco hydroelectric development following a strong earthquake. Water losses and the effects of leakage on slope stability were of concern. Cracks were found in the concrete lining of the shaft and opened joints, which acted as leakage paths, were found in the rock mass. Leakage increased with shaft water pressure. The cracked area of the shaft was relined. Extensometers in the slope showed only normal seasonal movements, no slope instability being observed.
876399 Geotechnical assessment of a power house cavity at Uri Hydel project, Kashmir Himalaya, India Dhar, Y R
Proc International Symposium on Large Rock Caverns, Helsinki, 25-28 August 1986 V2, P929-941. Publ Oxfor& Pergamon Press, 1986
876403 Stability analysis and strengthening for high side walls of the underground power house and draft tubes at Baishan Hydropower Station Zhou Xianjie; Feng Chongan Proc 5th International Congress International Association of Engineering Geology, Buenos Aires, 20-25 October 1986 V1.
The siting of the underground powerhouse in deformed basic volcanic rocks is discussed. The rocks are generally foliated and contain shear seams. Site exploration and geology, and laboratory and field investigations are described. Rock stress evaluation includes a simplified technique to take into account mountain topography, and tectonic stress directions are inferred from joint analysis. The orientation and dimensions of the cavern, and its support system were chosen with due respect to in situ conditions.
The engineering geological conditions of the underground powerhouse, stability analysis of the walls, and reinforcement adopted are described. It is suggested that the stability of sound blocky rock is governed by the discontinuities present and in situ stress, and that stability analysis should be based on observed conditions during construction. Using this approach, an analysis was made of the Baishan powerhouse and support measures, rock bolts and cables, specified. Support has proved effective in use.
8764OO Post-construction behaviour of a large cavern in poor rocks of lower Himalayas Dube, A K; Singh, B Proc International Symposium on Large Rock Caverns,
Heisinki, 25-28 August 1986 V2, P943-949. Publ Oxford." Pergamon Press, 1986 A power house in jointed and sheared dolomite limestone was the first large cavern in the tectonically active Himalayas. Planning and design were on the basis of very limited information about the host rock. A steel arch was used for roof support, and was instrumented with strain gauges. Roof stress over 12 years has been recorded. The state of stability is evaluated on the basis of current data and geotechnical knowledge. The factor of safety is high and the opening is fairly stable.
P233-246. Publ Rotterdam." A A Balkema. 1986
Mines See also: 876036, 876151, 876202, 876204, 876249, 876264, 876265, 876404 Course of convergence in gateroads supported with arches and rock bolts (In German and English) yon Nyga, J
Gluckauf V123, N9, 7 May 1987, P528-530(German), P255257(English) Between 1974 and 1976 an equation to calculate convergence of gateroads with single sided winning was established on the basis of in situ measurements, taking into account floorstone index, seam thickness, and roadside pack index. Further work
© 1987 Pergamon Journals Ltd. Reproduction not permitted
Power plants See also: 876101 876397 Tunnel plug design at Tyee Lake Cogan, J; Kintzer, F C
Bull Assoc Engng Geol V24, NI, Feb 1987, P27-42 Tunnel plugs isolate water under pressure from open parts of a tunnel. The plug must limit leakage and be designed so that applied loads do not damage the plug or the surrounding rock. General criteria for positioning a plug to avoid rock splitting are discussed. The problems, which increase for high head projects, are examined, and the sufficient cover criteria for unlined rock tunnels are reviewed. Reported plug failures and experiences at the Tyee Lake project are described. 876398 Limits for pressure tunnels without steel linings Blind, H; Schwarz, J Int Water Power Dam Constr V39, N7, July 1987, P51-54
Proc International Symposium on Large Rock Caverns, Helsinki, 25-28 August 1986 ~ , P1099-I l I0. Publ OxJbrd: Pergamon Press. 1986 Underground excavations cause damage and stress redistribution in surrounding rocks. During construction of an underground powerhouse in granite, seismic wave velocity and attenuation measurements, Lugeon tests,and convergence measurements were carried out. For rocks within 4m of the walls, permeability increased by 30 times or more, and seismic wave velocity and amplitude decreased by up to 30% and 90% respectively. Rock strains of 0.08-0.27% were recorded. At a distance of 7m from the sidewall, rock properties were unaffected. 876402 Rock mass monitoring of the Tabuaco hydraulic circuit Cunha, A P; Ferreira da Silva, A
Proc 5th International Congress International Association of Engineering Geology, Buenos Aires, 20-25 October 1986 V1, P187-192. Publ Rotterdam: A A Balkema, 1986
At the initial design stage of a project, only a little information concerning topography, rock mass .classification, and internal pressure is available. Simple static calculations give only an indication of whether an impervious steel lining is necessary. Data collected from over 200 tunnels has been analysed, and relations between rock cover, rock quality and load are presented. Conditions where concrete linings or no lining at all will suffice are evaluated.
Water inflow was found in galleries near the surge shaft of the Vilar-Tabuaco hydroelectric development following a strong earthquake. Water losses and the effects of leakage on slope stability were of concern. Cracks were found in the concrete lining of the shaft and opened joints, which acted as leakage paths, were found in the rock mass. Leakage increased with shaft water pressure. The cracked area of the shaft was relined. Extensometers in the slope showed only normal seasonal movements, no slope instability being observed.
876399 Geotechnical assessment of a power house cavity at Uri Hydel project, Kashmir Himalaya, India Dhar, Y R
Proc International Symposium on Large Rock Caverns, Helsinki, 25-28 August 1986 V2, P929-941. Publ Oxfor& Pergamon Press, 1986
876403 Stability analysis and strengthening for high side walls of the underground power house and draft tubes at Baishan Hydropower Station Zhou Xianjie; Feng Chongan Proc 5th International Congress International Association of Engineering Geology, Buenos Aires, 20-25 October 1986 V1.
The siting of the underground powerhouse in deformed basic volcanic rocks is discussed. The rocks are generally foliated and contain shear seams. Site exploration and geology, and laboratory and field investigations are described. Rock stress evaluation includes a simplified technique to take into account mountain topography, and tectonic stress directions are inferred from joint analysis. The orientation and dimensions of the cavern, and its support system were chosen with due respect to in situ conditions.
The engineering geological conditions of the underground powerhouse, stability analysis of the walls, and reinforcement adopted are described. It is suggested that the stability of sound blocky rock is governed by the discontinuities present and in situ stress, and that stability analysis should be based on observed conditions during construction. Using this approach, an analysis was made of the Baishan powerhouse and support measures, rock bolts and cables, specified. Support has proved effective in use.
8764OO Post-construction behaviour of a large cavern in poor rocks of lower Himalayas Dube, A K; Singh, B Proc International Symposium on Large Rock Caverns,
Heisinki, 25-28 August 1986 V2, P943-949. Publ Oxford." Pergamon Press, 1986 A power house in jointed and sheared dolomite limestone was the first large cavern in the tectonically active Himalayas. Planning and design were on the basis of very limited information about the host rock. A steel arch was used for roof support, and was instrumented with strain gauges. Roof stress over 12 years has been recorded. The state of stability is evaluated on the basis of current data and geotechnical knowledge. The factor of safety is high and the opening is fairly stable.
P233-246. Publ Rotterdam." A A Balkema. 1986
Mines See also: 876036, 876151, 876202, 876204, 876249, 876264, 876265, 876404 Course of convergence in gateroads supported with arches and rock bolts (In German and English) yon Nyga, J
Gluckauf V123, N9, 7 May 1987, P528-530(German), P255257(English) Between 1974 and 1976 an equation to calculate convergence of gateroads with single sided winning was established on the basis of in situ measurements, taking into account floorstone index, seam thickness, and roadside pack index. Further work
© 1987 Pergamon Journals Ltd. Reproduction not permitted