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Drilled shaft construction at Crownpoint, New Mexico
53A Results of ground control work carried out in Consolidation Coal Company mines and their benefits are described. 852107 Sinking a freeze shaft with installation of a watertight, flexible lining Stoss, K; Braun, B
Proc 6th Rapid Excavation and Tunneling Conference, Cbicngo, 12-16 June 1983 VI, P513-532. Publ New York: AIME, 1983 The ground freezing method was applied to safely sink a large mine shaft through unstable, waterbearing strata. Geological and hydrological conditions, and the technical concept of sinking and lining the shaft are presented. The excavation and lining of the large filling stations using rock anchors and shotcrete are noted. 852108 Drilled shaft construction at Crownpoint, New Mexico Hunter, H E
Proc 6th Rapid Excavation and Tmmeling Conference, Chicago, 12-16 June 1983 V1, P544-565. Publ New York: AIME, 1983 The objective of the Crownpoint Project was to develop an underground uranium mine at an approximate depth of 2180 feet. Three shafts that were successfully drilled and lined with hydrostatic designed steel casings are examined. 852109 Pressure galleries and pressure shafts in the weak rock mass reinforced by bolting (In German) Gergowicz, Z B
In: Rock Mechanics: Caverns and Pressure Shafts (paper to the ISRM Symposium, Aachen, 26-28 May 1982) V3, P12391243. Publ Rotterdam: A. A. Balkema, 1984 One of the basic factors emphasised in the design of a lining for pressure galleries and pressure shafts is to ensure a good collaboration between a steel shell and a rock mass surrounding the pit. Results of generally applied methods of calculation and those in practice, indicate that this collaboration can only be obtained by special technological operations or by adequate construction. The concept of such a type of special construction, suitable for a weak rock mass, is presented. Applying a provisional lining in the form of rock bolting is an additional element. With adequate technology, the lining permits the use of shrinkage-compensating concretes as an envelopment of the steel shell. 852110 Underground seismic networks and safety Spottiswoode, S M
In: Monitoring for Safety in Geotechaical Engineering, 10 August 1984 P39-46. Publ South Africa: South African National Group on Rock Mechanics, 1984 Design criteria for underground seismic networks are discussed in relation to observed ground-motion spectra and to strong motion data. The importance of quantitative seismicity in mine design is discussed. It is argued that the in-situ behaviour of support, especially backfill, should be studied with strong motion instruments in the region supported.
852111 Measurement of rock deformation about excavations in hard rock mining Atkins, A R; Keen, M A
In: Monitoring for Safety in Geotechaical Engineering, 10 August 1984 P47-53. Publ South Africa: South African National Group on Rock Mechanics, 1984 Rock deformation resulting from high mining induced stresses causes many difficulties in the design and support of mine excavations. This paper describes a variety of techniques used to study the mechanism of fracture and deformations ahead of advancing stope faces in gold mines. The petroscope proved to be a useful instrument for determining the extent and intensity of fractures around excavations. Extensometers revealed quantitatively the magnitudes of the various types of displacements and are both reliable and accurate.
Tunnels See also: 852050, 852211, 852230, 852234 852112 Experience using compressed-air drivage and shotcreting (In German and English) Weber, J
Tunnel N1, Feb 1984, P16-28 Shotcreting has been used extensively in the construction stages of the Munich Metro, Germany, and on a number of occasions with compressed air drivage in water bearing soil. The technique has resulted in a clear reduction in subsidence. 852113 Experience with exter-,~meter measurement for underground railway construction in Bielefeid (In German and English) Blumel, W; Buchmann, K J
Tmuel N2, May 1984, P78-86 As part of Bielefeld's Underground construction scheme, the tunnel sections for Construction Sections 1322-51 are largely being driven by mining means. Extensive measurements are being carried out in order to determine possible effects upon the surroundings and to control the supporting measures. Multiple point extensometers were installed vertical to the surface of the terrain and horizontal to the tunnel in the claystone beneath the sandy and silty covering layers. Novel fibre glass rods were used for the vertical extensometers, while extensometers with clamping anchors were used for the horizontal measurements. 852114 Limit analysis of sidling reinforcement system in soft ground tunnelling (In German and English) Bang,S
Tunnel N3, Aug 1984, P140-146 A stability analysis procedure of the spiling reinforcement system in soft ground tunnelling is presented. A limiting stress equilibrium analysis was performed to establish a design method for the system. The formulation included consideration of design parameters, such as soil type; depth and diameter of the tunnel length; and inclination and spacing of the spiles. A comparison of the potential failure surface predicted by the finite element analysis with generalised plane strain conditions was made with that predicted by limiting stress equilibrium analysis. Agreement was found to be reasonably good.
Proc 6th Rapid Excavation and Tunneling Conference, Cbicngo, 12-16 June 1983 VI, P513-532. Publ New York: AIME, 1983 The ground freezing method was applied to safely sink a large mine shaft through unstable, waterbearing strata. Geological and hydrological conditions, and the technical concept of sinking and lining the shaft are presented. The excavation and lining of the large filling stations using rock anchors and shotcrete are noted. 852108 Drilled shaft construction at Crownpoint, New Mexico Hunter, H E
Proc 6th Rapid Excavation and Tmmeling Conference, Chicago, 12-16 June 1983 V1, P544-565. Publ New York: AIME, 1983 The objective of the Crownpoint Project was to develop an underground uranium mine at an approximate depth of 2180 feet. Three shafts that were successfully drilled and lined with hydrostatic designed steel casings are examined. 852109 Pressure galleries and pressure shafts in the weak rock mass reinforced by bolting (In German) Gergowicz, Z B
In: Rock Mechanics: Caverns and Pressure Shafts (paper to the ISRM Symposium, Aachen, 26-28 May 1982) V3, P12391243. Publ Rotterdam: A. A. Balkema, 1984 One of the basic factors emphasised in the design of a lining for pressure galleries and pressure shafts is to ensure a good collaboration between a steel shell and a rock mass surrounding the pit. Results of generally applied methods of calculation and those in practice, indicate that this collaboration can only be obtained by special technological operations or by adequate construction. The concept of such a type of special construction, suitable for a weak rock mass, is presented. Applying a provisional lining in the form of rock bolting is an additional element. With adequate technology, the lining permits the use of shrinkage-compensating concretes as an envelopment of the steel shell. 852110 Underground seismic networks and safety Spottiswoode, S M
In: Monitoring for Safety in Geotechaical Engineering, 10 August 1984 P39-46. Publ South Africa: South African National Group on Rock Mechanics, 1984 Design criteria for underground seismic networks are discussed in relation to observed ground-motion spectra and to strong motion data. The importance of quantitative seismicity in mine design is discussed. It is argued that the in-situ behaviour of support, especially backfill, should be studied with strong motion instruments in the region supported.
852111 Measurement of rock deformation about excavations in hard rock mining Atkins, A R; Keen, M A
In: Monitoring for Safety in Geotechaical Engineering, 10 August 1984 P47-53. Publ South Africa: South African National Group on Rock Mechanics, 1984 Rock deformation resulting from high mining induced stresses causes many difficulties in the design and support of mine excavations. This paper describes a variety of techniques used to study the mechanism of fracture and deformations ahead of advancing stope faces in gold mines. The petroscope proved to be a useful instrument for determining the extent and intensity of fractures around excavations. Extensometers revealed quantitatively the magnitudes of the various types of displacements and are both reliable and accurate.
Tunnels See also: 852050, 852211, 852230, 852234 852112 Experience using compressed-air drivage and shotcreting (In German and English) Weber, J
Tunnel N1, Feb 1984, P16-28 Shotcreting has been used extensively in the construction stages of the Munich Metro, Germany, and on a number of occasions with compressed air drivage in water bearing soil. The technique has resulted in a clear reduction in subsidence. 852113 Experience with exter-,~meter measurement for underground railway construction in Bielefeid (In German and English) Blumel, W; Buchmann, K J
Tmuel N2, May 1984, P78-86 As part of Bielefeld's Underground construction scheme, the tunnel sections for Construction Sections 1322-51 are largely being driven by mining means. Extensive measurements are being carried out in order to determine possible effects upon the surroundings and to control the supporting measures. Multiple point extensometers were installed vertical to the surface of the terrain and horizontal to the tunnel in the claystone beneath the sandy and silty covering layers. Novel fibre glass rods were used for the vertical extensometers, while extensometers with clamping anchors were used for the horizontal measurements. 852114 Limit analysis of sidling reinforcement system in soft ground tunnelling (In German and English) Bang,S
Tunnel N3, Aug 1984, P140-146 A stability analysis procedure of the spiling reinforcement system in soft ground tunnelling is presented. A limiting stress equilibrium analysis was performed to establish a design method for the system. The formulation included consideration of design parameters, such as soil type; depth and diameter of the tunnel length; and inclination and spacing of the spiles. A comparison of the potential failure surface predicted by the finite element analysis with generalised plane strain conditions was made with that predicted by limiting stress equilibrium analysis. Agreement was found to be reasonably good.