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Report of study tour of swedish operations
17A
useful general conclusions can be drawn, the subJect is not at all well umderstood. It is concludei that to develop a better understanding of the smbJect, the bit deviation forces induced by rock anisotropy should be measured under a variety of rotary drilling comditions. The data so obtained could be applied in modifications of currently available mathematical models of drillstring mechanics which could be used to predict likely bit deviations or to determine the stabilizing c~ steering forces required for particular drill-string configurations. 62 refs.
8n145 HEMISPHERICAL INDENTATION AND THE DESIGN OF " B U R N BITS" FOR PERCUSSIVE DRILLING Lundquist, R G Proc 22nd US Symposium on Rock Mechanics, Cambridge, Mass, 2 9 June-2 July, 1981, P219-222. Publ Cambridge, Mass: MIT, 1981 The historical ~ o u m d to button bits is outlined, and e~phasis placed on the wide potential range of button bit design. Penetration rate can be increased by improving energy transfer from bit to rock, and by enhancing the interaction between indenters and previous craters. The theories of energy transfer and hem~Ispherical penetration are outlined. The application of these theeries to bit design is then discussed.
Blasting See ~Iso: 821026, 821029, 821031, 821106 821146 REPORT OF STUDY TOUR OF ~RDISH OPERATIONS Ingham, P D Trams Inst Min Metall (Se~ A Min Ind), Vg0, Oct 1981, PA207-A210
821149 INVESTIGATION OF ROCK SLOIVfING FOR USE IN TUNNELING E1 Sale, A A Proc 5th Rapid Excavation and Tunneling Conference, San Francisco, 3-7 May 1981, VI, P831-8~. Publ New York: AI~, 1981 The advantages of a new technique of rock slotting (a slot is made around the tunnel profile in hard rock) which reduces overbreak associated with blasting are listed. The use of a finite element computer program and beam theory to investigate the stresses and deflections fer such a tunnel for different slot depths is described, with results.
821150 FIELD TESTS WITH FRACTURE-CONTROL BLASTING TECHNIQUES Oriardj L L Prec 5th Rapid Excavation and Tunneling Conference, San Francisco, 3-7 May 1981 , VI, P874-88~. Publ New York: AIME, 1981
Describes fracture-control blasting, where the walls of the blastholes are notched to enhance the development of blast-induced fractures and control their direction. Three case histories using the technique are described: on a strongly anisotropic rock I massively Jointed limestone and concrete.
Rock and Soil Improvement Techniques Bol~and anchors See also: 821074
The use of large-diameter blastholes (LDB) (diameters greater than 100ram) is beimg tested at Malmberget Mine. Work is being carried out on the ~mplitude of vibration caused by the LDB blasting. Initial results show that blasting of a hole with three decks has only one peak vibration, when the first deck is initiated. 821147 COUPLED GAS PRESSURIZATION EXPLICIT FRACTURE MODEL FOR 0IL SHALE FRAGMENTATION Trent, B C; Young, C; Barbour, T G Proc 22nd US Symposittn on Rock Mechanics, Cambridge, Mass, 2 9 June-2 July 1981, P198-204. Publ C~mbridge, Mass: MIT, 1981 Presents a general explosive fragmentation model employing an explicit finite-difference code, and ir~orlx~rating mechanical properties of the oil shale deposit under consideration. The model is applied to the Geoklnetics Inc test site and the results are given. 821148 DRILLING-AND-BLASTING FOR SMALL TUN~S~LS Mayoj R S Proc 5th Rapid Excavation and Tunneling Conference, San Francisco, 3-7 May 1981, VI, P279-284o Publ New York: AIME, 1981 The author discusses his personal apl~roach to the construction of small rock tunnels reconmmending equipment and drill patterns.
821151 ROCKBOLTING IN SHAFTS IN THE POLISH MINING I~DUSTRY (IN RUSSIAN) Barchanski, B; Zadrozhny, M Shakhtnoe Stroit, N12, Dec 1980 , P23-25
Grouting See also: 821161
8n152 CONS0TmATION OF OROm~ USING m ~ - m ~ a w ~ ~ L ~ ~SIN (IN Z ~ ) Ravlart, A; Crombecque, H Industrle Minerale, Les Techniques, N~, April 1981, P323-338
Soil stabiUsation 821153 NEW USES FOR SOIL-CEMENT Dinchak, W G Civ Engng, NY, VSl, Ng, Sept 1981, P97-99 Describes, with the aid of brief case studies, the use of soil-cement in e m b a ~ n t construction, fo~ foundations, for erosion protection of coastal environments, and for seepage control.
useful general conclusions can be drawn, the subJect is not at all well umderstood. It is concludei that to develop a better understanding of the smbJect, the bit deviation forces induced by rock anisotropy should be measured under a variety of rotary drilling comditions. The data so obtained could be applied in modifications of currently available mathematical models of drillstring mechanics which could be used to predict likely bit deviations or to determine the stabilizing c~ steering forces required for particular drill-string configurations. 62 refs.
8n145 HEMISPHERICAL INDENTATION AND THE DESIGN OF " B U R N BITS" FOR PERCUSSIVE DRILLING Lundquist, R G Proc 22nd US Symposium on Rock Mechanics, Cambridge, Mass, 2 9 June-2 July, 1981, P219-222. Publ Cambridge, Mass: MIT, 1981 The historical ~ o u m d to button bits is outlined, and e~phasis placed on the wide potential range of button bit design. Penetration rate can be increased by improving energy transfer from bit to rock, and by enhancing the interaction between indenters and previous craters. The theories of energy transfer and hem~Ispherical penetration are outlined. The application of these theeries to bit design is then discussed.
Blasting See ~Iso: 821026, 821029, 821031, 821106 821146 REPORT OF STUDY TOUR OF ~RDISH OPERATIONS Ingham, P D Trams Inst Min Metall (Se~ A Min Ind), Vg0, Oct 1981, PA207-A210
821149 INVESTIGATION OF ROCK SLOIVfING FOR USE IN TUNNELING E1 Sale, A A Proc 5th Rapid Excavation and Tunneling Conference, San Francisco, 3-7 May 1981, VI, P831-8~. Publ New York: AI~, 1981 The advantages of a new technique of rock slotting (a slot is made around the tunnel profile in hard rock) which reduces overbreak associated with blasting are listed. The use of a finite element computer program and beam theory to investigate the stresses and deflections fer such a tunnel for different slot depths is described, with results.
821150 FIELD TESTS WITH FRACTURE-CONTROL BLASTING TECHNIQUES Oriardj L L Prec 5th Rapid Excavation and Tunneling Conference, San Francisco, 3-7 May 1981 , VI, P874-88~. Publ New York: AIME, 1981
Describes fracture-control blasting, where the walls of the blastholes are notched to enhance the development of blast-induced fractures and control their direction. Three case histories using the technique are described: on a strongly anisotropic rock I massively Jointed limestone and concrete.
Rock and Soil Improvement Techniques Bol~and anchors See also: 821074
The use of large-diameter blastholes (LDB) (diameters greater than 100ram) is beimg tested at Malmberget Mine. Work is being carried out on the ~mplitude of vibration caused by the LDB blasting. Initial results show that blasting of a hole with three decks has only one peak vibration, when the first deck is initiated. 821147 COUPLED GAS PRESSURIZATION EXPLICIT FRACTURE MODEL FOR 0IL SHALE FRAGMENTATION Trent, B C; Young, C; Barbour, T G Proc 22nd US Symposittn on Rock Mechanics, Cambridge, Mass, 2 9 June-2 July 1981, P198-204. Publ C~mbridge, Mass: MIT, 1981 Presents a general explosive fragmentation model employing an explicit finite-difference code, and ir~orlx~rating mechanical properties of the oil shale deposit under consideration. The model is applied to the Geoklnetics Inc test site and the results are given. 821148 DRILLING-AND-BLASTING FOR SMALL TUN~S~LS Mayoj R S Proc 5th Rapid Excavation and Tunneling Conference, San Francisco, 3-7 May 1981, VI, P279-284o Publ New York: AIME, 1981 The author discusses his personal apl~roach to the construction of small rock tunnels reconmmending equipment and drill patterns.
821151 ROCKBOLTING IN SHAFTS IN THE POLISH MINING I~DUSTRY (IN RUSSIAN) Barchanski, B; Zadrozhny, M Shakhtnoe Stroit, N12, Dec 1980 , P23-25
Grouting See also: 821161
8n152 CONS0TmATION OF OROm~ USING m ~ - m ~ a w ~ ~ L ~ ~SIN (IN Z ~ ) Ravlart, A; Crombecque, H Industrle Minerale, Les Techniques, N~, April 1981, P323-338
Soil stabiUsation 821153 NEW USES FOR SOIL-CEMENT Dinchak, W G Civ Engng, NY, VSl, Ng, Sept 1981, P97-99 Describes, with the aid of brief case studies, the use of soil-cement in e m b a ~ n t construction, fo~ foundations, for erosion protection of coastal environments, and for seepage control.