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Directional blasting in rockfill dam construction
30A 851266
Drilling
Dynamic soil-structure interaction: centrifugal modeling Prevost, J H; Scanlan, R H
Soil Dynam Earthq Engng V2, N4, Oct 1983, P212-221 The dynamic response of soil-structure interacting systems, such as piles and footings, is studied using centrifuges. The results are compared with theoretical results anticipated by well-established theories.
851267 Centrifugal model analysis of pile and raft foundations subject to earthquakes Zelikson, A; Leguay, P; Pascal, C
Soil Dynam Earthq Engng V2, N4, Oct 1983, P222-227 Centrifuge tests using a model of an existing power plant on its raft foundation and the same model based on 10 anchor piles were carried out. The piled foundation performance was found to compare very well to that of the raft.
851270
Water jet uses in sandstone excavation Zink, E A; Zink, G P; Wolgamott, J E; Robertson, J W
Proc 6th Rapid Excavation and Tunneling Conference, Chicago, 12-16 June 1983 V2, P685-700. Publ New York: AIME. 1983 High velocity water assisted rotary drilling for blast and bolt holes has been used in the excavation of tunnels, shafts, trenches and underground chambers of the McPhee Dam, constructed in medium strength sandstones in Colorado and Utah, USA. Drilling performance, effects on work environment, safety and controlled blasting results are described.
Blasting 851271
Directional blasting in rockfili dam construction
Comminution of Rocks 851268
Soil mechanics aspects of dredging Van Leussen, W; Nieuwenhuis, J D
Nedriga, V P; Pokrovsky, G I; Lushnov, N P
lnt Water Power Dam Constr V35, N6. June 1983, P37-40 Directional blasting is often used to produce the material to construct rock fill dams in mountainous regions in the USSR. The grain size distribution of the rock soil produced by blasting is examined.
Geotechnique V34, N3, Sept 1984, P359-381
851272
Results from a research programme to demonstrate that soil mechanics parameters play a dominant part in many dredging processes are presented. Each of the geotechnicai parameters acting in these processes and their estimation by field tests are noted.
Blast design considerations for underground mining and construction operations
851269
The effects of several parameters on blast design and the results of blasting, particularly fragmentation and overbreak, are discussed: rock mass properties, blasthole drilling, charge properties, initiation and priming, blast geometry, and initiation sequence and delay timing.
Testing of a fragmentation system for a hard rock mining machine Brunsing, T; Morin, R
US Bureau of Mines report OFR 73-84, Nov 1983, 78P The purpose of this programme was to develop deep-kerfing and core-breaking techniques to be incorporated into the design of a field prototype hard-rock mining machine. The machine is designed to mine non-abrasive bedded deposits up to 20,000 psi in uniaxial compressive strength. The mining technique involves cutting approximately 2ft-deep parallel kerfs spaced 2ft apart in either a horizontal or vertical direction and subsequently breaking out the cores as defined. The programme was aimed at minimizing the required kerr width, obtaining reliable breaking within that kerr width, and determining cutter blade requirements necessary to achieve a mining rate of 20 cubic ft/min. Full-scale breaking and half-scale kerfing experiments were employed to evaluate the system. High-strength concrete test specimens were used to simulate the rock being cut and broken. The results indicate that the kerr-break technique can achieve the desired mining rate by utilizing two 7ft-diam blades to cut 2in-wide by 24in-deep kerfs. A lateral load applied to the base of the kerf was selected as the core-breaking technique to be employed by the full-scale machine.
Avail: NTIS, Springfield, Va 22161, USA (PB 84-186394)
Hagan, T N
Proc ISRM Symposium on Design and Performance of Underground Excavations, Cambridge, 3-6 Sept 1984 P255262. Publ London: British Geotechnical Society. 1984
851273
Approach to enhancement of deep hole blasting efficiency in shaft sinking Wu Leeyun
Proc ISRM Symposium on Design and Performance of Underground Excavations, Cambridge, 3-6 Sept 1984 P321325. Publ London: British Geotechnical Society, 1984 A vertical shaft with a 5.9m diameter and 610m depth has been sunk, through marble stratum in a copper mine. To facilitate faster shaft sinking, a blasting round of 4.5-5.3m deep holes was used. A great many trials have been completed to discover the influential factors in the blasting efficiency of deep holes, especially of the cut holes. On the basis of this work, a maximum advance of 3.9m in one blasting round, and a total advance of 115.25m in one month have been achieved.
Crushing and grinding 851274
Material-dependent non-finear modeling of fine coal grinding Lytle, J M, Prisbrey, K A
Powder Technol V38, NI, March-April 1984. P93-97 Fine grinding of lignite in a ball mill was shown to be nonlinear in rate because of the presence of both weaker and stronger organic phases. Weaker phases were ground rapidly, whereas stronger phases were ground more slowly. Lignite grinding was modelled by evaluating two sets of time-independent linear
Drilling
Dynamic soil-structure interaction: centrifugal modeling Prevost, J H; Scanlan, R H
Soil Dynam Earthq Engng V2, N4, Oct 1983, P212-221 The dynamic response of soil-structure interacting systems, such as piles and footings, is studied using centrifuges. The results are compared with theoretical results anticipated by well-established theories.
851267 Centrifugal model analysis of pile and raft foundations subject to earthquakes Zelikson, A; Leguay, P; Pascal, C
Soil Dynam Earthq Engng V2, N4, Oct 1983, P222-227 Centrifuge tests using a model of an existing power plant on its raft foundation and the same model based on 10 anchor piles were carried out. The piled foundation performance was found to compare very well to that of the raft.
851270
Water jet uses in sandstone excavation Zink, E A; Zink, G P; Wolgamott, J E; Robertson, J W
Proc 6th Rapid Excavation and Tunneling Conference, Chicago, 12-16 June 1983 V2, P685-700. Publ New York: AIME. 1983 High velocity water assisted rotary drilling for blast and bolt holes has been used in the excavation of tunnels, shafts, trenches and underground chambers of the McPhee Dam, constructed in medium strength sandstones in Colorado and Utah, USA. Drilling performance, effects on work environment, safety and controlled blasting results are described.
Blasting 851271
Directional blasting in rockfili dam construction
Comminution of Rocks 851268
Soil mechanics aspects of dredging Van Leussen, W; Nieuwenhuis, J D
Nedriga, V P; Pokrovsky, G I; Lushnov, N P
lnt Water Power Dam Constr V35, N6. June 1983, P37-40 Directional blasting is often used to produce the material to construct rock fill dams in mountainous regions in the USSR. The grain size distribution of the rock soil produced by blasting is examined.
Geotechnique V34, N3, Sept 1984, P359-381
851272
Results from a research programme to demonstrate that soil mechanics parameters play a dominant part in many dredging processes are presented. Each of the geotechnicai parameters acting in these processes and their estimation by field tests are noted.
Blast design considerations for underground mining and construction operations
851269
The effects of several parameters on blast design and the results of blasting, particularly fragmentation and overbreak, are discussed: rock mass properties, blasthole drilling, charge properties, initiation and priming, blast geometry, and initiation sequence and delay timing.
Testing of a fragmentation system for a hard rock mining machine Brunsing, T; Morin, R
US Bureau of Mines report OFR 73-84, Nov 1983, 78P The purpose of this programme was to develop deep-kerfing and core-breaking techniques to be incorporated into the design of a field prototype hard-rock mining machine. The machine is designed to mine non-abrasive bedded deposits up to 20,000 psi in uniaxial compressive strength. The mining technique involves cutting approximately 2ft-deep parallel kerfs spaced 2ft apart in either a horizontal or vertical direction and subsequently breaking out the cores as defined. The programme was aimed at minimizing the required kerr width, obtaining reliable breaking within that kerr width, and determining cutter blade requirements necessary to achieve a mining rate of 20 cubic ft/min. Full-scale breaking and half-scale kerfing experiments were employed to evaluate the system. High-strength concrete test specimens were used to simulate the rock being cut and broken. The results indicate that the kerr-break technique can achieve the desired mining rate by utilizing two 7ft-diam blades to cut 2in-wide by 24in-deep kerfs. A lateral load applied to the base of the kerf was selected as the core-breaking technique to be employed by the full-scale machine.
Avail: NTIS, Springfield, Va 22161, USA (PB 84-186394)
Hagan, T N
Proc ISRM Symposium on Design and Performance of Underground Excavations, Cambridge, 3-6 Sept 1984 P255262. Publ London: British Geotechnical Society. 1984
851273
Approach to enhancement of deep hole blasting efficiency in shaft sinking Wu Leeyun
Proc ISRM Symposium on Design and Performance of Underground Excavations, Cambridge, 3-6 Sept 1984 P321325. Publ London: British Geotechnical Society, 1984 A vertical shaft with a 5.9m diameter and 610m depth has been sunk, through marble stratum in a copper mine. To facilitate faster shaft sinking, a blasting round of 4.5-5.3m deep holes was used. A great many trials have been completed to discover the influential factors in the blasting efficiency of deep holes, especially of the cut holes. On the basis of this work, a maximum advance of 3.9m in one blasting round, and a total advance of 115.25m in one month have been achieved.
Crushing and grinding 851274
Material-dependent non-finear modeling of fine coal grinding Lytle, J M, Prisbrey, K A
Powder Technol V38, NI, March-April 1984. P93-97 Fine grinding of lignite in a ball mill was shown to be nonlinear in rate because of the presence of both weaker and stronger organic phases. Weaker phases were ground rapidly, whereas stronger phases were ground more slowly. Lignite grinding was modelled by evaluating two sets of time-independent linear