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Overburden drilling and blasting at Kleinkopje colliery
150A
Blasting
Kong blasting regulations were on the conservative side. This was confirmed when the literature was searched for examples of documented effects in similar situations. A suitable set of rules for blasting in Hong Kong granite is suggested.
See also: 874075, 874259 874167 Perimeter control blasting for underground excavations in fractured and weathered rock McKown, A F Bull Assoc Engng Geol V23, N4. Nov 1986, P461-478 The most common perimeter control techniques available for use are briefly reviewed. A simple method for evaluating perimeter control results is presented. Two case histories wherein conventional perimeter control techniques were modified to produce good results in fractured and weathered rock are examined. 874168 Role of blasting control in excavation works near a preexisting tunnel Berry, P; Dantini, E M In: Rock Engineering and Excavation in an Urban
Em~ironment (papers to the Conference, Hong Kong, 24-27 February 1986) P15-25. Publ London: IMM, 1986 Blasting control procedures adopted for the driving of a tunnel close to a penstock are described. A preliminary assessment was made of the vibrations from the explosions in the rock mass and on the tunnel walls, and the effects of the blasting were continuously monitored during construction. It was shown that the criterion of maximum particle velocity is adequate to guarantee the safety of the penstock for close-in blasts. The importance of seismicity caused by the blast air waves, and the different laws governing seismicity in the rock mass and near the tunnel are shown. Different blasting procedures were adopted according to distance from the penstock. 874169 Blasting studies in the excavation of an underground water reservoir in granite rock Ciccu, R; Manca, P P; Massacci, G; Pedemonte, C In: Rock Engineering and Excavation in an Urban Environment (papers to the Conference, Hong Kong, 24-27
February 1986) P97-107. Publ London: IMM, 1986 Preliminary work for this underground project in Sardinia included a geological survey, which revealed the presence of an important fault. An experimental blasting program was undertaken and measured vibration of surface structures was very much less than anticipated. This was explained taking into account the geological structure and the fact that the structures were founded on fill materials, which led to attenuation of elastic wave propagation. Construction proceeded using controlled blasting.
874170 Ap~atsal of potential effects of surface blasting on a rock tunMI, ~ t h p a ~ l a r reference to the Tai Lam ~ wa.ter tunnel, Hong Kong Clover, A W In: Rock Engineering and Excavation in an Urban Environment (papers to the Conference, Hong Kong, 24-27 February 1986) P109-120. Publ London: IMM, 1986 Effects of surface blasting on a tunnel in granite were examined from t w o viewpoints, dynamic loading during the passage of blast vibrations and gravity induced roof fall due to the relative movement of rock blocks. Results suggested Hong
874171 Drilling and blasting developments at Finsch Mine Gastrow, H G; Cather. D C
Proc 2nd Group Mining Symposium, Johannesburg, Sept 1985 P127-133. Johannesburg: Anglo American Corporation. 1985 This diamond mine in a Kimbertite pipe will be worked by underground mining using sub-level stoping from 1988. Open pit drilling and blasting techniques have been studied with a view to their adoption for underground mining. Results o f the conversion from conventional explosives to pumpable emulsions for development blasting are discussed. It is planned to use emulsion explosives together with large diameter blast holes to improve productivity. Different underground blast layouts are prepared. 874172 Use of high speed photography to improve blasting efliciences Kruger, L W: Freyberg, P C
Proc 2nd Group Mining Symposium, Johannesburg, Sept 1985 P135-141. Johannesburg: Anglo American Corporation, 1985 Using high speed photography it is possible to study blasting parameters which cannot be examined by conventional methods. Tangible advances in overburden blasting, with better fragmentation and improved blast ratio, have been achieved by optimisation of delay timing. Studies of the effectiveness of stemming materials used in underground blasting operations are also reported.
874173 Overburden drilling and blasting at Kleinkopje colliery Watts, R A; Steyn, W J H Proc 2nd Group Mining Symposium, Johannesburg, Sept 1985 P143-148. Johannesburg: Anglo American Corporation, 1985 The overburden at this South African open pit mine consists of a number of layers of sandstone, siltstone and shales. Initial mining was in geologically favourable areas, but problems arose where thicker and less predictable layers of sandstone were encountered. Large diameter drilling is now used, with deck charging following borehole gamma ray logging, and presplitting is used to minimise back break problems. Slurry explosives were replaced by the cheaper ANFO when it was realised that the blast holes were effectively ctewatered. Past, present and predicted drilling, charging and blasting procedures are reviewed. 874174 Longer blast holes for more effective dev~opment On Swedish) Niklasson, B; 0isson, K; Schorling, SI Hoim~rg; R Swedish Detonic Research Foundaffon report DS 1986:4, 24
Oct 1986, lOOP A joint venture project between LKAB, Atlas Copco MCT AB and SveDeFo has been carried o u t in order to :investigate if larger advances in drifting c a n be achieved through mechanised drill steel lengthening and improved blasting technique. The aim of the project was to increase the advanecs in development work to 7m in a safe way. Field tests at LKAB, Malmberget, showed that the aim could be fulfilled. Auth,:
Avail: The Foundation, Box 32058, S-126 11 Stockholm, Sweden
© 1987 Pergamon Journals Ltd. Reproduction not permitted
Blasting
Kong blasting regulations were on the conservative side. This was confirmed when the literature was searched for examples of documented effects in similar situations. A suitable set of rules for blasting in Hong Kong granite is suggested.
See also: 874075, 874259 874167 Perimeter control blasting for underground excavations in fractured and weathered rock McKown, A F Bull Assoc Engng Geol V23, N4. Nov 1986, P461-478 The most common perimeter control techniques available for use are briefly reviewed. A simple method for evaluating perimeter control results is presented. Two case histories wherein conventional perimeter control techniques were modified to produce good results in fractured and weathered rock are examined. 874168 Role of blasting control in excavation works near a preexisting tunnel Berry, P; Dantini, E M In: Rock Engineering and Excavation in an Urban
Em~ironment (papers to the Conference, Hong Kong, 24-27 February 1986) P15-25. Publ London: IMM, 1986 Blasting control procedures adopted for the driving of a tunnel close to a penstock are described. A preliminary assessment was made of the vibrations from the explosions in the rock mass and on the tunnel walls, and the effects of the blasting were continuously monitored during construction. It was shown that the criterion of maximum particle velocity is adequate to guarantee the safety of the penstock for close-in blasts. The importance of seismicity caused by the blast air waves, and the different laws governing seismicity in the rock mass and near the tunnel are shown. Different blasting procedures were adopted according to distance from the penstock. 874169 Blasting studies in the excavation of an underground water reservoir in granite rock Ciccu, R; Manca, P P; Massacci, G; Pedemonte, C In: Rock Engineering and Excavation in an Urban Environment (papers to the Conference, Hong Kong, 24-27
February 1986) P97-107. Publ London: IMM, 1986 Preliminary work for this underground project in Sardinia included a geological survey, which revealed the presence of an important fault. An experimental blasting program was undertaken and measured vibration of surface structures was very much less than anticipated. This was explained taking into account the geological structure and the fact that the structures were founded on fill materials, which led to attenuation of elastic wave propagation. Construction proceeded using controlled blasting.
874170 Ap~atsal of potential effects of surface blasting on a rock tunMI, ~ t h p a ~ l a r reference to the Tai Lam ~ wa.ter tunnel, Hong Kong Clover, A W In: Rock Engineering and Excavation in an Urban Environment (papers to the Conference, Hong Kong, 24-27 February 1986) P109-120. Publ London: IMM, 1986 Effects of surface blasting on a tunnel in granite were examined from t w o viewpoints, dynamic loading during the passage of blast vibrations and gravity induced roof fall due to the relative movement of rock blocks. Results suggested Hong
874171 Drilling and blasting developments at Finsch Mine Gastrow, H G; Cather. D C
Proc 2nd Group Mining Symposium, Johannesburg, Sept 1985 P127-133. Johannesburg: Anglo American Corporation. 1985 This diamond mine in a Kimbertite pipe will be worked by underground mining using sub-level stoping from 1988. Open pit drilling and blasting techniques have been studied with a view to their adoption for underground mining. Results o f the conversion from conventional explosives to pumpable emulsions for development blasting are discussed. It is planned to use emulsion explosives together with large diameter blast holes to improve productivity. Different underground blast layouts are prepared. 874172 Use of high speed photography to improve blasting efliciences Kruger, L W: Freyberg, P C
Proc 2nd Group Mining Symposium, Johannesburg, Sept 1985 P135-141. Johannesburg: Anglo American Corporation, 1985 Using high speed photography it is possible to study blasting parameters which cannot be examined by conventional methods. Tangible advances in overburden blasting, with better fragmentation and improved blast ratio, have been achieved by optimisation of delay timing. Studies of the effectiveness of stemming materials used in underground blasting operations are also reported.
874173 Overburden drilling and blasting at Kleinkopje colliery Watts, R A; Steyn, W J H Proc 2nd Group Mining Symposium, Johannesburg, Sept 1985 P143-148. Johannesburg: Anglo American Corporation, 1985 The overburden at this South African open pit mine consists of a number of layers of sandstone, siltstone and shales. Initial mining was in geologically favourable areas, but problems arose where thicker and less predictable layers of sandstone were encountered. Large diameter drilling is now used, with deck charging following borehole gamma ray logging, and presplitting is used to minimise back break problems. Slurry explosives were replaced by the cheaper ANFO when it was realised that the blast holes were effectively ctewatered. Past, present and predicted drilling, charging and blasting procedures are reviewed. 874174 Longer blast holes for more effective dev~opment On Swedish) Niklasson, B; 0isson, K; Schorling, SI Hoim~rg; R Swedish Detonic Research Foundaffon report DS 1986:4, 24
Oct 1986, lOOP A joint venture project between LKAB, Atlas Copco MCT AB and SveDeFo has been carried o u t in order to :investigate if larger advances in drifting c a n be achieved through mechanised drill steel lengthening and improved blasting technique. The aim of the project was to increase the advanecs in development work to 7m in a safe way. Field tests at LKAB, Malmberget, showed that the aim could be fulfilled. Auth,:
Avail: The Foundation, Box 32058, S-126 11 Stockholm, Sweden
© 1987 Pergamon Journals Ltd. Reproduction not permitted