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Seismicity associated with the extraction of stressed remnants in the Klerkdorp gold mining district, South Africa
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892440 Design for buried pipeline can reduce seismic hazards Whitelaw, J A: Reppond, D W Oil Gas J V86. ,V42. 17 Oct 1988, P62-72 Damage can be caused to buried pipelines because of fault movement, landslides, liquefaction, densification, ground cracking or ground movement associated with seismic activity. Preventative measures are discussed, with particular attention to design considerations to minimise damage caused by fault offset and soil pipeline interaction as the pipe attempts to move.
892441 Influence of the horizontal component of deformation on surface buildings Kamenicek, I; Zadinova, V Proe ECONMIG 86, Stuttgart, 16-18 Sept 1986 V2, 8P. Publ Stuttgart: Unicersity of Stuttgart, 1986 Driving of tunnels will cause displacements in the surrounding rock or soil mass. Although the vertical component is normally studied, the horizontal component may be more damaging to brickwork structures. Both components can be calculated using the finite element program MKP. Case studies are described where deformations were modelled mathematically and physically and results used to enable preventative measures against damage to historic buildings to be planned.
892442 Seismicity associated with the extraction of stressed remnants in the Klerksdorp gold mining district, South Africa Syratt, P P Proe 2nd International Symposium of Rockbursts and Seismicity in Mines, Minneapolis, 8-10 June 1988 P73-81. Publ Minneapolis." Unit'ersiO' of Mhmesota. 1988 Microseismic and macroscismic data were collected during remnant extraction in the Klerksdorp area to investigate the time dependency of macroscopic events relative to the final extraction of remnants, the use of microscismic aftershocks to define source parameters, and the extent and magnitude of slip
along an abutment. Analysis of the data showed that the rate of microseismic emission increases until the remnant reaches specific dimensions, then significantly declines, suggesting yield and that, once microseismicity has declined, a number of large macroseismic events occurs along an adjacent abutment, suggesting transfer of remnant stresses. The distribution of microseismic aftershocks clearly defined the limits of the source areas. There was a close correlation between the occurrence of macroscopic events and the final stages of remnant extraction.
Subjects Peripheral to Geomechanics Snow and ice mechanics See also: 892052 892443 Tectonic processes in a surge-type glacier Sharp, M; Lawson, W; Anderson, R S J Struct Geol VIO, N5. 1988. P499-515 The kinematics of the surge of Variegated Glacier, Alaska, such as ice velocities and displacements, longitudinal strain rates and cumulative strains, surface folds and thrust faults, are described. These observations allow 3 distinct structural zones to be identified. Next, relations between structures and deformation on a smaller scale are considered, showing how development, growth and down glacier propagation of surge velocity peak produced distinct patterns of ice deformation reflected in the ice structures developed. Use of these structures in understanding of the mechanisms of thrust sheet emplacement, and relationships between morphology of the thrust sheet and its deformation history are discussed.
~ 1989 Pergamon Press pie. Reproduction not permitted
892440 Design for buried pipeline can reduce seismic hazards Whitelaw, J A: Reppond, D W Oil Gas J V86. ,V42. 17 Oct 1988, P62-72 Damage can be caused to buried pipelines because of fault movement, landslides, liquefaction, densification, ground cracking or ground movement associated with seismic activity. Preventative measures are discussed, with particular attention to design considerations to minimise damage caused by fault offset and soil pipeline interaction as the pipe attempts to move.
892441 Influence of the horizontal component of deformation on surface buildings Kamenicek, I; Zadinova, V Proe ECONMIG 86, Stuttgart, 16-18 Sept 1986 V2, 8P. Publ Stuttgart: Unicersity of Stuttgart, 1986 Driving of tunnels will cause displacements in the surrounding rock or soil mass. Although the vertical component is normally studied, the horizontal component may be more damaging to brickwork structures. Both components can be calculated using the finite element program MKP. Case studies are described where deformations were modelled mathematically and physically and results used to enable preventative measures against damage to historic buildings to be planned.
892442 Seismicity associated with the extraction of stressed remnants in the Klerksdorp gold mining district, South Africa Syratt, P P Proe 2nd International Symposium of Rockbursts and Seismicity in Mines, Minneapolis, 8-10 June 1988 P73-81. Publ Minneapolis." Unit'ersiO' of Mhmesota. 1988 Microseismic and macroscismic data were collected during remnant extraction in the Klerksdorp area to investigate the time dependency of macroscopic events relative to the final extraction of remnants, the use of microscismic aftershocks to define source parameters, and the extent and magnitude of slip
along an abutment. Analysis of the data showed that the rate of microseismic emission increases until the remnant reaches specific dimensions, then significantly declines, suggesting yield and that, once microseismicity has declined, a number of large macroseismic events occurs along an adjacent abutment, suggesting transfer of remnant stresses. The distribution of microseismic aftershocks clearly defined the limits of the source areas. There was a close correlation between the occurrence of macroscopic events and the final stages of remnant extraction.
Subjects Peripheral to Geomechanics Snow and ice mechanics See also: 892052 892443 Tectonic processes in a surge-type glacier Sharp, M; Lawson, W; Anderson, R S J Struct Geol VIO, N5. 1988. P499-515 The kinematics of the surge of Variegated Glacier, Alaska, such as ice velocities and displacements, longitudinal strain rates and cumulative strains, surface folds and thrust faults, are described. These observations allow 3 distinct structural zones to be identified. Next, relations between structures and deformation on a smaller scale are considered, showing how development, growth and down glacier propagation of surge velocity peak produced distinct patterns of ice deformation reflected in the ice structures developed. Use of these structures in understanding of the mechanisms of thrust sheet emplacement, and relationships between morphology of the thrust sheet and its deformation history are discussed.
~ 1989 Pergamon Press pie. Reproduction not permitted