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Tunnel excavation at the Bad Creek Project
123A and seepage control by panning. Application of these remedial measures is described. Finally, long-term cost benefit analysis is presented,
Power plants
902474 Several aspects of formation of structures of computer programs, selection and algorithmization of medium models in geomechanics Yufin, A A; Titkov, V I; Morozov, A S; Berdzenishvili, T L Proc 6th International Conference on Numerical Methods in Geomechanics, Innsbruck, 11-15 April 1988 VI. P231-236. Publ Rotterdam: A A Balkema, 1988 The principles behind the FEM computer code STATAS are discussed. Its development and application to model the displacements around the machine hall of the Khoudoni hydropower scheme, with and without support, are illustrated. Input data were based on triaxial compression tests and on geophysical site investigation, which delineated a zone of weak rock.
See also: 902307
902471 Tunnel excavation at the Bad Creek Project Holley, T H Proc 1987 Rapid Excavation and Tunnelling Conference, New Orleans, 14-17 June 1987 I/2, P839-849. Publ Littleton: Society of Mining Engineers, 1987 The Bad Creek Pumped Storage Project, South Carolina, will involve over 3.5km of 4.2-9m diameter tunnel and a large powerhouse cavern and shaft. It is being constructed in hard Toxaway Gneiss, which is foliated and contains some shear zones and dykes. Site investigation via a pilot tunnel and core drilling, drill and blast excavation, and temporary and final support are described.
902472 Importance of multiple stress measurements in design, Balsam Meadow Hydroelectric Project Hamilton, P; Korbin, G E Proc 1987 Rapid Excavation and Tunnelling Conference, New Orleans, 14-17 June 1987 V2, P850-866. Publ Littleton: Society of Mining Engineers. 1987 The Balsam Meadow Project, California, is sited in a quartz diorite rock mass. Extensive core drilling was carried out around zones of potential weakness delineated by mapping. In situ stress measurements indicated a minimum horizontal stress around 4.83MPa in the powerhouse region. Large water flow and dilated joints were seen, which encouraged reassessment of the stress regime. Minimum in situ stress around the lower power tunnel was found to be 2.21MPa, this lower value being due to influence of joint systems. Tunnel lining requirements were consequently amended.
902473 Planning and construction of concrete lining in head race tunnel surge and penstock tunnels of Upper Kolab Project in Orissa Mohanty, S K; Rath, R C Proc International Symposium Tunnellingfor Water Resources and Power Projects, New Delhi, 19-23 January 1988 VI, P287-292. Publ New Delhi: Oxford and IBH Publishing Co. 1988 Lining of the headrace tunnel is described, in particular invert and arch lining of the main tunnel, and concrete lining of the surge shaft and pressure tunnel, Progress of work in the main tunnel, pressure tunnel and surge shaft is outlined. Some problems were encountered due to construction and planning deficiencies, and included water leakage, undercuts, regrading the pressure tunnel and alignment of the surge shaft.
Mines See also: 902083, 902305 902475 Pillar design for mines in saltrnck - 1 Hambley, D F Min Sci Technoi V9, N2, Sept 1989, P111-123 Methods of pillar design for rock salt, and those for coal and hard rock which are sometimes applied in saltrock, are examined. Simplistic approaches, confined-core pillar method, numerical modelling and the combination approach of Mraz are described. The major deficiency identified was failure to distinguish between ductile and brittle behaviour. No laboratory-field size scale effects were found where laboratory specimen diameter was greater than 150mm. The inclusion of width to height ratios in empirical pillar design formulae is merely a means of accounting for the three dimensional stress state of the interior of large pillars. 902476 Pillar sizing Mrugala, M J; Belesky, R M Rock Mechanics as a Guide for E2ffcient Utilization of Natural Resources: Proc 30th U.S. Symposium, Morgantown, 19-22 June 1989 P395-402. Publ Rotterdam: A A Balkema, 1989 Pillar sizing based on empirically derived formulae has been practiced for many years. Coal strengths based on scaled laboratory uniaxial compressive strengths and back calculations from in situ observations of pillar stability suggest that material strength scaling rules applied are of doubtful accuracy. Analysis presented suggests that there is no universal scaling factor for all coals and that scaling factors below 0.5 give best correlations with observed pillar stabilities. 902477 Applications approach to harrier pillar design for improved resource recovery Koehler, J R; Jones, S D; DeMarco, M J Rock Mechanics as a Guide for E~cient Utilization of Natural Resources: Proc 30th U.S. Symposium, Morgantown, 19-22 June 1989 P403-410. Publ Rotterdam: A A Balkema. 1989 Barrier pillars act as primary abutments for loads generated by production panel mining. Available design methods do not adequately account for overburden caving characteristics, load transfer, geologic anomalies, or effect of multiple seam or panel extraction. A study in a multi-seam setting is presented. Insufficient barrier width resulted in excessive load transfer to
1990 Pergamon Press plc. Reproduction not permitted
Power plants
902474 Several aspects of formation of structures of computer programs, selection and algorithmization of medium models in geomechanics Yufin, A A; Titkov, V I; Morozov, A S; Berdzenishvili, T L Proc 6th International Conference on Numerical Methods in Geomechanics, Innsbruck, 11-15 April 1988 VI. P231-236. Publ Rotterdam: A A Balkema, 1988 The principles behind the FEM computer code STATAS are discussed. Its development and application to model the displacements around the machine hall of the Khoudoni hydropower scheme, with and without support, are illustrated. Input data were based on triaxial compression tests and on geophysical site investigation, which delineated a zone of weak rock.
See also: 902307
902471 Tunnel excavation at the Bad Creek Project Holley, T H Proc 1987 Rapid Excavation and Tunnelling Conference, New Orleans, 14-17 June 1987 I/2, P839-849. Publ Littleton: Society of Mining Engineers, 1987 The Bad Creek Pumped Storage Project, South Carolina, will involve over 3.5km of 4.2-9m diameter tunnel and a large powerhouse cavern and shaft. It is being constructed in hard Toxaway Gneiss, which is foliated and contains some shear zones and dykes. Site investigation via a pilot tunnel and core drilling, drill and blast excavation, and temporary and final support are described.
902472 Importance of multiple stress measurements in design, Balsam Meadow Hydroelectric Project Hamilton, P; Korbin, G E Proc 1987 Rapid Excavation and Tunnelling Conference, New Orleans, 14-17 June 1987 V2, P850-866. Publ Littleton: Society of Mining Engineers. 1987 The Balsam Meadow Project, California, is sited in a quartz diorite rock mass. Extensive core drilling was carried out around zones of potential weakness delineated by mapping. In situ stress measurements indicated a minimum horizontal stress around 4.83MPa in the powerhouse region. Large water flow and dilated joints were seen, which encouraged reassessment of the stress regime. Minimum in situ stress around the lower power tunnel was found to be 2.21MPa, this lower value being due to influence of joint systems. Tunnel lining requirements were consequently amended.
902473 Planning and construction of concrete lining in head race tunnel surge and penstock tunnels of Upper Kolab Project in Orissa Mohanty, S K; Rath, R C Proc International Symposium Tunnellingfor Water Resources and Power Projects, New Delhi, 19-23 January 1988 VI, P287-292. Publ New Delhi: Oxford and IBH Publishing Co. 1988 Lining of the headrace tunnel is described, in particular invert and arch lining of the main tunnel, and concrete lining of the surge shaft and pressure tunnel, Progress of work in the main tunnel, pressure tunnel and surge shaft is outlined. Some problems were encountered due to construction and planning deficiencies, and included water leakage, undercuts, regrading the pressure tunnel and alignment of the surge shaft.
Mines See also: 902083, 902305 902475 Pillar design for mines in saltrnck - 1 Hambley, D F Min Sci Technoi V9, N2, Sept 1989, P111-123 Methods of pillar design for rock salt, and those for coal and hard rock which are sometimes applied in saltrock, are examined. Simplistic approaches, confined-core pillar method, numerical modelling and the combination approach of Mraz are described. The major deficiency identified was failure to distinguish between ductile and brittle behaviour. No laboratory-field size scale effects were found where laboratory specimen diameter was greater than 150mm. The inclusion of width to height ratios in empirical pillar design formulae is merely a means of accounting for the three dimensional stress state of the interior of large pillars. 902476 Pillar sizing Mrugala, M J; Belesky, R M Rock Mechanics as a Guide for E2ffcient Utilization of Natural Resources: Proc 30th U.S. Symposium, Morgantown, 19-22 June 1989 P395-402. Publ Rotterdam: A A Balkema, 1989 Pillar sizing based on empirically derived formulae has been practiced for many years. Coal strengths based on scaled laboratory uniaxial compressive strengths and back calculations from in situ observations of pillar stability suggest that material strength scaling rules applied are of doubtful accuracy. Analysis presented suggests that there is no universal scaling factor for all coals and that scaling factors below 0.5 give best correlations with observed pillar stabilities. 902477 Applications approach to harrier pillar design for improved resource recovery Koehler, J R; Jones, S D; DeMarco, M J Rock Mechanics as a Guide for E~cient Utilization of Natural Resources: Proc 30th U.S. Symposium, Morgantown, 19-22 June 1989 P403-410. Publ Rotterdam: A A Balkema. 1989 Barrier pillars act as primary abutments for loads generated by production panel mining. Available design methods do not adequately account for overburden caving characteristics, load transfer, geologic anomalies, or effect of multiple seam or panel extraction. A study in a multi-seam setting is presented. Insufficient barrier width resulted in excessive load transfer to
1990 Pergamon Press plc. Reproduction not permitted