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Determination of rock drillability in diamond drilling by a groove cutting method
198A affected by both hardness and abrasiveness. The latter property affects the rate of wear of the drill bit matrix and thus the rate of exposure of new diamond. Further work on a wide variety of rock materials is still required. 875208 Core drilling with Syndax 3 polycrystalline diamond Clark, I E; Stafto, G R
Proc Drillcx 87, Stoneleigh, 7-10 April 1987 P33-45. Publ London: L.~IM, 1987 The development of polycrystalline diamond, which is available in large pieces, has led to the design of a new type of drill bit which cuts rock primarily by shear, rather than crushing. Laboratory and field tests have been carried out on hard rocks (Cornish granite, Pennant sandstone) and soft rocks (Carrera marble) and very high penetration rates combined with excellent core recovery have been achieved. Recommendations are made of optimum conditions of use to maximise bit life.
875209 Determination of rock driUability in diamond drilling by a groove cutting method Fei Shoulin; Chen Yutian; Zhang Jingfang; Wang Lianyin Proc Drillex 87, Stoneleigh, 7-10 April 1987 P47-52. Publ London: IMM, 1987 A new method of determining rock drillability has been developed, based on cutting a grooved ring on a rock core specimen with a diamond impregnated test rod under controlled conditions. The loss in diameter of rock core can be correlated with drilling rate and loss in weight of the rod with bit life. The apparatus is simple, quick, and reliable for field or laboratory measurements. A rock drilIability classification scheme has been developed based of the parameters measured. 875210 New diamond drilling techniques in China He Yizhang
Proc Driilex 87, Stoneleigh, 7-10 April 1987 P53-56. Publ London: [MM, 1987 The following are described: a hydro-percussive-rotary diamond drilling tool; a continuous whipstock for directional drilling; a downhole mud motor; and polycrystaUine diamond bits. Their use can increase penetration rates in hard rocks, or improve the accuracy and cost effectiveness in directional drilling.
Blasting 875211 Analysis of stress waves induced from single hole stemmed blasts Cowan, B W; Otuonye, F O; Ligon, J B
Min Sci Technol I"5, NI, April 1987, P83-88 A study to determine the type of stemming which minimises the danger to structural integrity of mine openings from face blasting is presented. The location of the blast on the face, and the effect of roof and face deterioration due to repeated blasting, which attenuates the strength of the blast waves, were taken into account when analysing results from in-mine blasts. Laboratory model tests were also carried out. Results suggest stemmed blasts produce lower energy waves than nonstemmed blasts.
875212 Safe use of explosives in quarries Saunders. E
Quarry ~fanage ['14. N2. Feb 19.~'7. P31-37 The causes of accidents during blasting, particularly those due to projected material, are examined. Factors identified include: incorrect setting up of drilling machines or deviation of shotholes: incorrect assessment of lace profile in front of shotholes: unsupervised firing of trimming shots: re-initiation of misfired charges; use of loose grained explosives in fragmented strata; incorrect delay periods: and geological faults. cavities, and discontinuities. Preventative measures are discusssed. 875213 Simulated blasting
World Min Equipment VI2. N3, March;April 1987. P32-33 An advanced blast simulation model, SABREX, is described. It takes into account explosive type, rock type, and blast geometry. The following blast parameters may be output in printed form or as colour graphics: fragmentation; muckpile profile; grade fracture and control; collar breakage and flyrock control; backbreak; and drilling and blasting costs. SABREX may be applied to reduce costs, define blast geometry, for vibration or wall control, and to assess explosive performance.
875214 Design considerations for underground blasts in an urban environment Hagan, T N In: Rock Engineering and Excavation in an Urban Environment (papers to the conference, Hong Kong, 24-27 February, 1986) P187-195. Publ London: IMM. 1986 Good fragmentation and a loose and suitably profiled muckpile, with acceptable vibration and flyrock, are obtainable with careful blast design. Parameters examined are: diameter, alignment and length of blasthole; shape and condition of faces; void volume available for blasted rock; burden distance. subdrilling, and size and shape of blast block; and, in particular, allocation of delay detonations. 875215 Segment-shaped blasting at Baishan hydroelectric station excavations, China Guo Zongyan; Zhou Yukun In: Rock Engineering and Excavation in an Urban Environment (papers to the conference, Hong Kong, 24-27
February, 1986) P181-185. Publ London: IMM, 1986 The 'segment-shaped blasting' technique was adopted for the downstream dyke excavation of the dam base. A fan-shaped series of holes was drilled from a pilot tunnel, and blasted to increase the excavation to its final size in successive segments. The technique allowed the dam base to be drilled before the river was diverted. Excavation speed was increased, the quality of the dam base excavation improved, and environmental disturbance due to drilling and blasting lowered.
875216 Safety control for large-scale underwater blasting Sugita, H; Katayama, E; Yamashita, M; Ohtsuka, I Proc IABSE Symposium, Safety and Quality Assurance of Civil Engineering Structures, Tokyo, 1986 P267-273. Publ Zurich: [ABSE, 1986 The construction of foundations for a large bridge, within a specified timescale, required extensive under~'ater blasting, yet no damage could be allowed to happen to a neighbouring oil refinery. Initial work involved tank experiments and in situ
© 1987 Pergamon Journals Ltd. Reproduction not permitted
Proc Drillcx 87, Stoneleigh, 7-10 April 1987 P33-45. Publ London: L.~IM, 1987 The development of polycrystalline diamond, which is available in large pieces, has led to the design of a new type of drill bit which cuts rock primarily by shear, rather than crushing. Laboratory and field tests have been carried out on hard rocks (Cornish granite, Pennant sandstone) and soft rocks (Carrera marble) and very high penetration rates combined with excellent core recovery have been achieved. Recommendations are made of optimum conditions of use to maximise bit life.
875209 Determination of rock driUability in diamond drilling by a groove cutting method Fei Shoulin; Chen Yutian; Zhang Jingfang; Wang Lianyin Proc Drillex 87, Stoneleigh, 7-10 April 1987 P47-52. Publ London: IMM, 1987 A new method of determining rock drillability has been developed, based on cutting a grooved ring on a rock core specimen with a diamond impregnated test rod under controlled conditions. The loss in diameter of rock core can be correlated with drilling rate and loss in weight of the rod with bit life. The apparatus is simple, quick, and reliable for field or laboratory measurements. A rock drilIability classification scheme has been developed based of the parameters measured. 875210 New diamond drilling techniques in China He Yizhang
Proc Driilex 87, Stoneleigh, 7-10 April 1987 P53-56. Publ London: [MM, 1987 The following are described: a hydro-percussive-rotary diamond drilling tool; a continuous whipstock for directional drilling; a downhole mud motor; and polycrystaUine diamond bits. Their use can increase penetration rates in hard rocks, or improve the accuracy and cost effectiveness in directional drilling.
Blasting 875211 Analysis of stress waves induced from single hole stemmed blasts Cowan, B W; Otuonye, F O; Ligon, J B
Min Sci Technol I"5, NI, April 1987, P83-88 A study to determine the type of stemming which minimises the danger to structural integrity of mine openings from face blasting is presented. The location of the blast on the face, and the effect of roof and face deterioration due to repeated blasting, which attenuates the strength of the blast waves, were taken into account when analysing results from in-mine blasts. Laboratory model tests were also carried out. Results suggest stemmed blasts produce lower energy waves than nonstemmed blasts.
875212 Safe use of explosives in quarries Saunders. E
Quarry ~fanage ['14. N2. Feb 19.~'7. P31-37 The causes of accidents during blasting, particularly those due to projected material, are examined. Factors identified include: incorrect setting up of drilling machines or deviation of shotholes: incorrect assessment of lace profile in front of shotholes: unsupervised firing of trimming shots: re-initiation of misfired charges; use of loose grained explosives in fragmented strata; incorrect delay periods: and geological faults. cavities, and discontinuities. Preventative measures are discusssed. 875213 Simulated blasting
World Min Equipment VI2. N3, March;April 1987. P32-33 An advanced blast simulation model, SABREX, is described. It takes into account explosive type, rock type, and blast geometry. The following blast parameters may be output in printed form or as colour graphics: fragmentation; muckpile profile; grade fracture and control; collar breakage and flyrock control; backbreak; and drilling and blasting costs. SABREX may be applied to reduce costs, define blast geometry, for vibration or wall control, and to assess explosive performance.
875214 Design considerations for underground blasts in an urban environment Hagan, T N In: Rock Engineering and Excavation in an Urban Environment (papers to the conference, Hong Kong, 24-27 February, 1986) P187-195. Publ London: IMM. 1986 Good fragmentation and a loose and suitably profiled muckpile, with acceptable vibration and flyrock, are obtainable with careful blast design. Parameters examined are: diameter, alignment and length of blasthole; shape and condition of faces; void volume available for blasted rock; burden distance. subdrilling, and size and shape of blast block; and, in particular, allocation of delay detonations. 875215 Segment-shaped blasting at Baishan hydroelectric station excavations, China Guo Zongyan; Zhou Yukun In: Rock Engineering and Excavation in an Urban Environment (papers to the conference, Hong Kong, 24-27
February, 1986) P181-185. Publ London: IMM, 1986 The 'segment-shaped blasting' technique was adopted for the downstream dyke excavation of the dam base. A fan-shaped series of holes was drilled from a pilot tunnel, and blasted to increase the excavation to its final size in successive segments. The technique allowed the dam base to be drilled before the river was diverted. Excavation speed was increased, the quality of the dam base excavation improved, and environmental disturbance due to drilling and blasting lowered.
875216 Safety control for large-scale underwater blasting Sugita, H; Katayama, E; Yamashita, M; Ohtsuka, I Proc IABSE Symposium, Safety and Quality Assurance of Civil Engineering Structures, Tokyo, 1986 P267-273. Publ Zurich: [ABSE, 1986 The construction of foundations for a large bridge, within a specified timescale, required extensive under~'ater blasting, yet no damage could be allowed to happen to a neighbouring oil refinery. Initial work involved tank experiments and in situ
© 1987 Pergamon Journals Ltd. Reproduction not permitted