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841144 Application possibilities of the autoregression model for the prediction of rock bursts (In Czech)
16A data were used to determine the extent of reinforcing measures required and to increase the possibility of forecasting ahead of the driving face.
841138 Todays situation for predictions of performance in projects with a tunnel boring machine Buchi, E Proc International Symposium on Engineering Geology and Underground Construction, Lisbon, 1983 V1, P3.87-3.94. Publ Lisbon: SPG, 1983 To predict penetration rate and the costs of a tunnel boring machine project, data obtained from geological and rock mechanical pre-investigations are input to a computer program. Corrections are done to account for the heterogeneity and jointedness of the actual rock mass.
841139 Remedial works to stabilize the ul~tream portal of the Albundra Tunnel Santos, J L T; Fernandes, J C G Proc International Symposium on Engineering Geology and Underground Construction, Lisbon, 1983 VI, P3.105-3.115. Publ Lisbon." SPG, 1983 Following considerable ground movement and a landslide, urgent remedial measures were required to stabilize the colluvium and marly clays in the upstream portal of the Alhandra Tunnel, Portugal. Three years after the remedial work: gabion retaining walls, major earth removal, flattening and benching, observations showed no deterioration in site stability.
Power plants
841142 Geotechnical evaluation of the second power house site of Srisailam hydroelectric project, Kurnool District, Andhra Pradesh, India Chari, K V R; Satpathy, U N; Jagadiswara Rao, R Proc International Symposium on Engineering Geology and Underground Construction, Lisbon, 1983 V1, P3.169-3.178. Publ Lisbon." SPG, 1983 The 120m high dam and first powerhouse are already under construction. The second underground powerhouse is located in a thick intercalated sequence of quartzite and soft, less cohesive shale. Careful geotechnical evaluation indicated that heavy support was required and that the powerhouse should be aligned to intersect the predominant fault direction at nearly transverse angles.
In-situ stresses and stress around underground openings See also: 841335, 841336, 841337 841143 Statistical analysis of the space-time dependence of rock bursts (In Czech) Dessokey, M M Acta Montana N61, 1982, P27-39 A statistical analysis of three areas of the Wujek and Szombierki Collieries, Czechoslovakia, showed that: (1) rock bursts with total energy exceeding 10KJ were independent of each other, (2) grouping of smaller outbursts was observed in precisely identified parts of the investigated zones, and (3) no direct connection existed between the grouping of these small outbursts and the frequency of occurrence of larger rock bursts in that area.
See a~o. 841177, 841184 841140 Blasting the plug is the big turn-on in Alaska Martin, D Tunn Tunnig VI5, NIO, Oct 1983, P21-23 Describes progress on the Tyee Lake Hydroelectric Project, the second 'lake-tap' hydroelectric scheme in Alaska, USA. Work includes: a largely unlined 7000ft lower tunnel driven by drill and blast through mostly sound quartz diorite with widely spaced joints, a 1132ft vertical pressure shaft also driven by drill and blast which required a section of poured concrete lining in addition to wire fabric and rock bolts, and a 427ft upper tunnel driven through difficult, blocky ground conditions.
841141 Geology of the hydraulic circuit of the hydro-electric development of Alto Lindoso (Portugal) Neiva, J M C; Guimaraes, J N Proc International Symposium on Engineering Geology and Underground Construction, Lisbon, 1983 V1, P3.131-3.139. Publ Lisbon." SPG, 1983 Following a detailed geological and geotechnical survey of the Lima River site, Portugal, which revealed faulted micaschists and granites, it was decided to construct an underground powerhouse approximately 200m below the river bed in unaltered, undeformed rock. The tailrace tunnel and underground cavern will need primary support in zones of faulted or weathered rock.
841144 Application possibilities of the autoregression model for the prediction of rock bursts (In Czech) Rudajev, V; Fucik, P Acta Montana N61, 1982, P47-60 A multi-channel autoregression method was used to predict the incidence of rock bursts, their time and expected energy. The model was applied to rock bursts in the bituminous coal district of Kladno, using seismic, seismo-acoustic and convergence data.
841145 Possibilities of rock burst location in the coal district of Ostrava-Karvina (In Czech) Bata, S Acta Montana N61, 1982, P89-102 The author considers that a theoretical analysis of the rock medium is required, the results being checked with models and compared with seismic images and practical experience in rock burst-prone zones. Computer programs are described which have been tested on models and have allowed the simulation of 10 rock bursts, with promising results.
841146 Types of rock bursts in Ostrava-Karvina coalfield according to geophysical measm'ements (In Czech) Holub, K Acta Montana N61, 1982, p103-108 Following seismoacoustic and seismological measurements in 3 mines in the Ostrava-Karvina coalfield, Czechoslovakia, two basic types of rock burst were established. These were: (1) a focal zone situated within the coal seam, the burst causing crushing and ejection of coal into the mine workings, and (2) a burst originating in a dislocation zone in the roof of the seam,
841138 Todays situation for predictions of performance in projects with a tunnel boring machine Buchi, E Proc International Symposium on Engineering Geology and Underground Construction, Lisbon, 1983 V1, P3.87-3.94. Publ Lisbon: SPG, 1983 To predict penetration rate and the costs of a tunnel boring machine project, data obtained from geological and rock mechanical pre-investigations are input to a computer program. Corrections are done to account for the heterogeneity and jointedness of the actual rock mass.
841139 Remedial works to stabilize the ul~tream portal of the Albundra Tunnel Santos, J L T; Fernandes, J C G Proc International Symposium on Engineering Geology and Underground Construction, Lisbon, 1983 VI, P3.105-3.115. Publ Lisbon." SPG, 1983 Following considerable ground movement and a landslide, urgent remedial measures were required to stabilize the colluvium and marly clays in the upstream portal of the Alhandra Tunnel, Portugal. Three years after the remedial work: gabion retaining walls, major earth removal, flattening and benching, observations showed no deterioration in site stability.
Power plants
841142 Geotechnical evaluation of the second power house site of Srisailam hydroelectric project, Kurnool District, Andhra Pradesh, India Chari, K V R; Satpathy, U N; Jagadiswara Rao, R Proc International Symposium on Engineering Geology and Underground Construction, Lisbon, 1983 V1, P3.169-3.178. Publ Lisbon." SPG, 1983 The 120m high dam and first powerhouse are already under construction. The second underground powerhouse is located in a thick intercalated sequence of quartzite and soft, less cohesive shale. Careful geotechnical evaluation indicated that heavy support was required and that the powerhouse should be aligned to intersect the predominant fault direction at nearly transverse angles.
In-situ stresses and stress around underground openings See also: 841335, 841336, 841337 841143 Statistical analysis of the space-time dependence of rock bursts (In Czech) Dessokey, M M Acta Montana N61, 1982, P27-39 A statistical analysis of three areas of the Wujek and Szombierki Collieries, Czechoslovakia, showed that: (1) rock bursts with total energy exceeding 10KJ were independent of each other, (2) grouping of smaller outbursts was observed in precisely identified parts of the investigated zones, and (3) no direct connection existed between the grouping of these small outbursts and the frequency of occurrence of larger rock bursts in that area.
See a~o. 841177, 841184 841140 Blasting the plug is the big turn-on in Alaska Martin, D Tunn Tunnig VI5, NIO, Oct 1983, P21-23 Describes progress on the Tyee Lake Hydroelectric Project, the second 'lake-tap' hydroelectric scheme in Alaska, USA. Work includes: a largely unlined 7000ft lower tunnel driven by drill and blast through mostly sound quartz diorite with widely spaced joints, a 1132ft vertical pressure shaft also driven by drill and blast which required a section of poured concrete lining in addition to wire fabric and rock bolts, and a 427ft upper tunnel driven through difficult, blocky ground conditions.
841141 Geology of the hydraulic circuit of the hydro-electric development of Alto Lindoso (Portugal) Neiva, J M C; Guimaraes, J N Proc International Symposium on Engineering Geology and Underground Construction, Lisbon, 1983 V1, P3.131-3.139. Publ Lisbon." SPG, 1983 Following a detailed geological and geotechnical survey of the Lima River site, Portugal, which revealed faulted micaschists and granites, it was decided to construct an underground powerhouse approximately 200m below the river bed in unaltered, undeformed rock. The tailrace tunnel and underground cavern will need primary support in zones of faulted or weathered rock.
841144 Application possibilities of the autoregression model for the prediction of rock bursts (In Czech) Rudajev, V; Fucik, P Acta Montana N61, 1982, P47-60 A multi-channel autoregression method was used to predict the incidence of rock bursts, their time and expected energy. The model was applied to rock bursts in the bituminous coal district of Kladno, using seismic, seismo-acoustic and convergence data.
841145 Possibilities of rock burst location in the coal district of Ostrava-Karvina (In Czech) Bata, S Acta Montana N61, 1982, P89-102 The author considers that a theoretical analysis of the rock medium is required, the results being checked with models and compared with seismic images and practical experience in rock burst-prone zones. Computer programs are described which have been tested on models and have allowed the simulation of 10 rock bursts, with promising results.
841146 Types of rock bursts in Ostrava-Karvina coalfield according to geophysical measm'ements (In Czech) Holub, K Acta Montana N61, 1982, p103-108 Following seismoacoustic and seismological measurements in 3 mines in the Ostrava-Karvina coalfield, Czechoslovakia, two basic types of rock burst were established. These were: (1) a focal zone situated within the coal seam, the burst causing crushing and ejection of coal into the mine workings, and (2) a burst originating in a dislocation zone in the roof of the seam,