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Automated roof bolting for an in-place continuous miner
247A 876252 Extending the scope of application of rock bolting, and new developments fin German and English) Stephan, P Gluckauf V123, N9, 7 May 1987, P538-543(Germanj, P262264 (English) On-site measurements and model tests have been used to extend the scope of rock bolt support for use in more difficult conditions. A specific supporting pressure, related to rock strength, is significant to the development of fractures in the rock around a road. A combined bolt, showing the features of rigid and yielding bolts, is suggested, together with a new design of end plate to transmit forces from the bolt head to the lagging.
876253 Rockbolting for excavations in sensitive urban areas Luo Bangzhao In: Rock Engineering and Excavation in an Urban Environment (papers to the conference, Hong Kong, 24-27 February 1986) P197-209. Publ London: IMM, 1986 To prevent collapse of underground structures or settlement or ground movement damage of surface structures, it is necessary to install effective support in shallow underground workings as soon as possible. The New Austrian Tunnelling Method is much superior to the conventional underground construction methods in this respect. The capacity, design and requirements of rockbolting in urban areas, and safe excavation depths are considered. Principles, features and in situ testing of certain types of bolts are examined.
876254 Rock support prediction in the deep basement of Causeway Bay East Concourse for the Mass Transit Railway, Hong Kong Matson, C R; Choy, H H; Gibson, A M In: Rock Engineering and Excavation in an Urban Environment (papers to the conference, Hong Kong, 24-27 February 1986) P285-297. Publ London: IMM, 1986 This 35m deep basement was excavated top down through soft surficial layers and bottom up through granite bedrock. Predicted temporary support requirement was significantly affected by perceived geology and support design parameters assumed at the various stages of construction. The predicted bolting requirement for two critical rock faces varied from 200 to 240. The final excavation required just 171 bolts, and back analysis suggests this number could be further reduced.
876255 Automated roof bolting for an in-place continuous miner Pickerill, P Proc 2nd International Conference on Innovative Mining
Systems, Pennsylvania, 27-29 October 1986 P26-30. Publ Pennsylvania: Pennsyh'ania State University, 1986 The roof bolting cycle can be the rate limiting factor in continuous mining. Automation of the bolting cycle can potentially increase productivity and safety whilst lowering manpower requirements. A bolting machine which is an integral part of a continuous mining machine, and its function requirements, system mechanical design and control design are described.
876256 Superiority of the comprehensive evaluation method in the stability" estimation of surrounding rocks of karst caves - a practice in the expansion and reinforcement of a natural karst bridge Chang Shibiaa; Zhang Wenqing
Proc 5th International Congress International Association of Engineering Geology, Buenos Aires, 20-25 October 1986 VI, PI93-198. Publ Rotterdam: ,4 A Balkema, 1986 Protodyrakonov's collapse-arch theory has been largely replaced by the comprehensive evaluation method (CEM) to estimate the stability of rocks around underground excavations. The superiority of the CEM for use with natural cavities is demonstrated with reference to support for a bridge of corroded limestone above a natural karst cavity. Reinforced concrete lining of part of the roof arch and the bridge top surface, connected by bolts, was much cheaper than the complete roof arch lining required according to the Protodyrakonov theory.
Shotcrete 876257 Implementation of a shotcrete support system in the underground section at Thabazimbi iron ore mine Lourens, M J; Lindsay, J R W Assoc Mine Alangr S Afr Circ N1/87, May 1987, P43-76 As workings deepened, timber support became ineffective, with frequent collapse and increased labour, material and transport costs. A geotechnical investigation resulted in recommendations for support design based on rock mass classification, using shotcrete as a major component. The relative effectiveness of shotcrete was demonstrated in trials against timber and steel arch support. Benefits accrued in terms of economics, safety, and extended life span of the mine.
876258 Bolts as a means of increasing the rate of advance in a road driven by shotfiring (In German and English) Rohrs, H Giuckauf V123, Ng, 7 May 1987, P543-545(German), P265266 (English) Blasting was chosen as the drivage method for a 2000m gateroad of 21 sqm section at the Ibbenburen colliery, Germany. Initial early support was by shotcrete and resin grouted bolts, with completely backfilled steel arches installed as final support. Extra costs of the use of bolts and shotcrete were more than compensated for by savings in labour and machine hire.
876259 Bolting-shotcreting linings in large mine structures (In German and English) Zischinsky, U Gluckauf V123, N9, 7 May 1987, P552-556(German), P272274(English) The advantages and disadvantages of using bolt-shotcrete support of large mine structures in Germany are discussed, with reference to time dependent properties and geological conditions. Modifications to improve the bearing capacity of the bolt-shotcrete system are suggested.
© 1987 Pergamon Journals Ltd. Reproduction not permitted
876253 Rockbolting for excavations in sensitive urban areas Luo Bangzhao In: Rock Engineering and Excavation in an Urban Environment (papers to the conference, Hong Kong, 24-27 February 1986) P197-209. Publ London: IMM, 1986 To prevent collapse of underground structures or settlement or ground movement damage of surface structures, it is necessary to install effective support in shallow underground workings as soon as possible. The New Austrian Tunnelling Method is much superior to the conventional underground construction methods in this respect. The capacity, design and requirements of rockbolting in urban areas, and safe excavation depths are considered. Principles, features and in situ testing of certain types of bolts are examined.
876254 Rock support prediction in the deep basement of Causeway Bay East Concourse for the Mass Transit Railway, Hong Kong Matson, C R; Choy, H H; Gibson, A M In: Rock Engineering and Excavation in an Urban Environment (papers to the conference, Hong Kong, 24-27 February 1986) P285-297. Publ London: IMM, 1986 This 35m deep basement was excavated top down through soft surficial layers and bottom up through granite bedrock. Predicted temporary support requirement was significantly affected by perceived geology and support design parameters assumed at the various stages of construction. The predicted bolting requirement for two critical rock faces varied from 200 to 240. The final excavation required just 171 bolts, and back analysis suggests this number could be further reduced.
876255 Automated roof bolting for an in-place continuous miner Pickerill, P Proc 2nd International Conference on Innovative Mining
Systems, Pennsylvania, 27-29 October 1986 P26-30. Publ Pennsylvania: Pennsyh'ania State University, 1986 The roof bolting cycle can be the rate limiting factor in continuous mining. Automation of the bolting cycle can potentially increase productivity and safety whilst lowering manpower requirements. A bolting machine which is an integral part of a continuous mining machine, and its function requirements, system mechanical design and control design are described.
876256 Superiority of the comprehensive evaluation method in the stability" estimation of surrounding rocks of karst caves - a practice in the expansion and reinforcement of a natural karst bridge Chang Shibiaa; Zhang Wenqing
Proc 5th International Congress International Association of Engineering Geology, Buenos Aires, 20-25 October 1986 VI, PI93-198. Publ Rotterdam: ,4 A Balkema, 1986 Protodyrakonov's collapse-arch theory has been largely replaced by the comprehensive evaluation method (CEM) to estimate the stability of rocks around underground excavations. The superiority of the CEM for use with natural cavities is demonstrated with reference to support for a bridge of corroded limestone above a natural karst cavity. Reinforced concrete lining of part of the roof arch and the bridge top surface, connected by bolts, was much cheaper than the complete roof arch lining required according to the Protodyrakonov theory.
Shotcrete 876257 Implementation of a shotcrete support system in the underground section at Thabazimbi iron ore mine Lourens, M J; Lindsay, J R W Assoc Mine Alangr S Afr Circ N1/87, May 1987, P43-76 As workings deepened, timber support became ineffective, with frequent collapse and increased labour, material and transport costs. A geotechnical investigation resulted in recommendations for support design based on rock mass classification, using shotcrete as a major component. The relative effectiveness of shotcrete was demonstrated in trials against timber and steel arch support. Benefits accrued in terms of economics, safety, and extended life span of the mine.
876258 Bolts as a means of increasing the rate of advance in a road driven by shotfiring (In German and English) Rohrs, H Giuckauf V123, Ng, 7 May 1987, P543-545(German), P265266 (English) Blasting was chosen as the drivage method for a 2000m gateroad of 21 sqm section at the Ibbenburen colliery, Germany. Initial early support was by shotcrete and resin grouted bolts, with completely backfilled steel arches installed as final support. Extra costs of the use of bolts and shotcrete were more than compensated for by savings in labour and machine hire.
876259 Bolting-shotcreting linings in large mine structures (In German and English) Zischinsky, U Gluckauf V123, N9, 7 May 1987, P552-556(German), P272274(English) The advantages and disadvantages of using bolt-shotcrete support of large mine structures in Germany are discussed, with reference to time dependent properties and geological conditions. Modifications to improve the bearing capacity of the bolt-shotcrete system are suggested.
© 1987 Pergamon Journals Ltd. Reproduction not permitted