- Email: [email protected]
Vibratory cutting of brown coal. Technical note
129A
Blasting See also: 816177 816180 ENGINEERING ASPECTS OF UNDERGEOUND CAVERN EXCAVATION AT DINOEWIC - PART 3. A S~JDY OF BLAST VIBRATIONS, PART 1 Isaac, I D; Bubb, C Tunn Turmlg, V24, N6, July 1981, P35-41 First describes the envirommental considerations which influenced the design of the drilling and blasting patterns and how measurements were made at Dinc~wic. Discusses the criteria asst~ed far establishing ground v i b r a t i o n t ~ s m e t e T s amd how the monitored results were used to design a~i control blasts. Results a r e compared with recent work carried out in Scandinavia. 816181 E ? ~ G I ~ I N G ASPECTS OF UND~RGROUED C A V ~ EXCAVATION AT DINOEWIC - PART 2. DRYTfTNG AND BLASTING Isaac, I D; Bubb, C Tunn Tunmlg, VI3, NS, June 1981, F19-21 The general principles uf drilling amd blasting urdergrouni caverns at Dinorwic are described, shcwing how the varying techniques were adapted to meet local conditions. Typical blast patterns are illustrated, showing how they were adapted for blasting heavily Jointed rock. The influence on drilling and charging patterns of the plant used is also discussed. 816182 SPHERICAL CE~RGE CRATERING - FLANE AND ANGLE GEOMETRY INVOLVING SM~IL-SCALE ANGLE AND ROW TESTS MacLachlan, R R; Salrmm, D E; Barclay~ R J CIM Bull, V74, N829, May 1981, P81-85 The ~est objectives were: (i) to observe the c h a ~ e in single-charge cratering perfc~,,a~e between plane-surface and angle geometry, (2) to ideztify the optimum perfcm~ance of single charges cratering to a plane surface, craterimg from a bench sub-grade position and cratering from a condition of zero sub-grade or stope wall geometry, and (3) to observe the performamce of row-of-charges craterizg to an angular surface at various row burials and spacing. The row charge burial and spacing dimensions were to be expressed in simple ~merical multiples of single-charge depth-of-burial data. 816183 SWEDISH CAUTIOUS BLAST EXCAVATION AT TEE C S ~ 0NVI TEST SITE IN COLORADO Holmberg, R; HusTAnllid, W Swedish Detonic Research Foundation, Report DS 1981:1, 16 Feb 19@1, ZIP Describes the excavation of a test roam at the Colorado School of Mines Experimental Mine in Idaho Springs, Colorado, utillslng the techniques of Presplitting ani smooth blasting. Avail: The Foundation, Box 32058, S-126 ll, Stockholm, Sweden 816181~ NUMERICAL INVESTIGATION OF A METHOD FOR STRESS WAVE M E A ~ IN ROCK Cooper, T; BJarmholt, G Swedish Detonlc Research Foundation~ Report DS 1981:2, 7 AprCI 1981, 16P
An alternative to strain gauge methods for measuring stress waves in rock is to measure the res~orme in a water filled borshole. A Lagr~nglan finite difference computer code has been used to investigate the difficulties associated with the me~cd. An idealized plane strain case (infinitely long horehcle) has been studied. Curves for pressure amd particle velocity versus time in the borehole are cc~pared with the corresponding curves on the original stress wave. The ccm~tations show that the method is feasible for measuring the peak pressure of the stress wave. Auth. Avail: The Foundation, Box 32058, S-126 ii, Stockholm, Sweden
816189 PROBABILITY
OF FLYROCK Lunibcrg, N Swedish Detonic Research Fourdation, Report DS 1981:9, 23 April 1981, 39P
Reports model tests, half scale amd full scale blasting tests, amd calculates maxim~n throw and probability of hit by flyrock. Reports observations during a number of production roumds at various sites in Sweden. Avail: The Four,i%tion, Box 32058, S-126 ll, Stockholm, Sweden
816186 NUMERICAL MODELLING OF AN EXPLOS.~fE CHARGE IN A BOREHCLE Cooper, T Swedish Detonic Research Foundation, Report DS 1980:1, 7 Feb 1980, 15P Avail: The Foundation~ Box 32058, S-126 Ii, Stockholm, Sweden
Crushing and grinding 816187 AUTOGENOUS ATIg/rION MICROGRINDING OF CALCIUM CARBONATE MINERALS Hansen, J P; Davis, E G; S,,11~v~_n, G V US Bureau of Mines report RI 8503, 1981, 15P Avail: USEM, 4800 Forbes Avenue, Pittsburgh, Fa, 15213 USA 816188 COMMINUTION BY THE ATTRITION GRINDING PROCESS Stanczyk, H; Feld, I L US Bureau of Mines Bulletin B670 , 1980, 43P The process involves the intense agitation of a slurry composed of the material to be ground, a granular griniimg medit~n and a suspe~iing fluid. Research has shown th~ process to be feasible for a variety of materials. Avail: Su;erinte~ient of Documents, USGPO, Washington, DC, 20402 USA
Cutting 816189 %q~RATORY CUTIING OF BRCXCN C0~l. TECHNICAL NCTE Gottlieb, L; Moore, P J Int J Rock Mech Min Scl, VIS, ~ , Aug 1981, F335-339
130A
The cutting of brown coal by bucket wheel excavators has been simulated in the laboratory by the use of an apparatus incorporating a small cutting tooth. This introdmctory pilot testing programme has indicated that the effect of vibrating the cutting tooth is to cause a reduction in the magnitude of the cu~tting force.
This report presents the results of an investiEation of inclined roof bolts, anchored over pillars, in room-and-pillar coal mines susceptible to shear failures of the roof. ~Ithough the field data do not support this contention, it is believed on the basis of analyses and other work that inclined roof bolts do offer potential under some circumstances. Auth.
Rock and Soil Improvement Techniques
Avail: NTIS, Springfield, Va, 22161 USA (FB 80-167h30 )
Bolts and anchors See also: 816127 816190 ANALYSIS OF ROCK BOLTING TO PREVENT SHEAR ~ S T IN F R A ~ GROUND Haasl C J Min Emgng, V33j ~ , June 1981, P6~8-70~ Reports arzl discusses lab tests on srtlfielal fract~es of varying r o ~ s s and varying ar~ between the bolt and the al~lled shear force.
•
Summarises the results of investigation into the ~ffect of initial stress az~ the stress changes taklr~ place at the anchorage horizon on roof bolts. In the laboratory h~irostatlc stress fields were induced and bolt load loss with time observed. s~atlstical analysis of data shewed that the stress field at the anchcr~e horizon has a considerable influence on mine roof bolts, ie the higher the stress level, the higher the anchorage efficiency. 816192 INORGANIC C ~ FOR MINE ROOF-BOLT GROOvfING Simpson, R E; Fraley, J E; Cox, D Jl US Bureau of Mines relxm't RI 8494, 980, 32P Relx~-ts tests of inorganic cements to replace resin grouts at a lower cost whilst rets/ning the advantages of a grouted bolt. An al;hagypsum cement, accelerated with ;~f~asailmm sull~hate, was selected as the best material, with adequate pull stremgth at a d e s i r e d s e t time of less than 5 minutes and was r e ~ ! ~ available.
816193 DEVELOFMEN~ OF A DUAL-BOGM SEMI-AUTOMATED ROOF BOLTER Hellar, C; Elliott, W; Hamilton, D US Bureau of Mines repert OFR 28-80, 31 Aug
1979,
49F
Avail: NTIS, S~rim6field, Va, 22161 USA (FB 80-i~8793 ) 816194 EFFECTIVENESS OF INCLINED ROOF BOLTS IN COAL MINES Sis@h, M M US Bureau of Mines report OFR hO-80, July
1978, i15~
OF A CABLE BOnTI~G ~OGRA~ ~ TH~
CON MINE Cassldy, K In: Undergrottnd Rock Engineering (Papers to 13t~h Cznsdlan Rock Mechanics Symposium, Toronto, 28-29 May 1980), P67-72. Publ Montreal: CIM~, 1980 Describes the existing grotund conditions, cable bolt design consid~atior~, and installation of the bolt at Con Mine, North West Territory, Canada.
816191 EFFECT OF IN SITU STRESSES ON THE STABILITY OF MINE ROOF BOLTS De Ls Cruz, R V; Mulkey, J R Min Er~ng, V32, Ne, Aug 1980, P1269-1272
Avail: USBM, 4800 Forbes Avenue, Pittsburgh, Fa, 15213 USA
816195 ~ A T I O N
816196 LABORATORY AND FIELD EVALUATION OF THE BONDING STRENDTH OF G R ~ ROCK ANCHORS Balllvy, G; DUpuis, M In: Underground Rock Engineering (Papers to 13th Canadian Rock Mechanics Symposium, Tcrozfco, 28-29 May 1980), P97-102. Publ Montreal: CIMM, 1980 Describes laboratory pullout tests conducted on limestones and shales to evaluate the bording strer4~th of grouted rock anchors. Compares the results to values obtained with existing formulae and in situ pullout tests.
Soil stabilisation 816197 SOIL STABILIZATION WITH FRE}~.J~TER FINES. TECHNICAL NOTE Bandyopadhyay, S S J GeOteCh Emg~g Div ASCE, VI07, NGTS, May
1981, P65~-658 Reports a s e r i e s of lab tests on selected subgrade soils showimg that the addition of preheater fines (a by-product from cement marmfacture) gemmrally results in decreased plasticity index and swelling and increased strength.
Freezing 816198 0SLO RAIL TUNNEL TURNS TO FBEEZIEG TO SAVE HISTORIC BUILDINGS Josamg, T Tunn Tunnlg, V!3, NS, June 1981, P26-28 Demcrlbes the use of freezim6 on a samdy gravel soll above a railway tunnel excavation in 0slo.
Site Investigation aM Field Observation 816199 REMOTE SENSING IN GEOLOGY Siegal, B; Gillespie, A R New York: Wiley, 1980, 702P
Blasting See also: 816177 816180 ENGINEERING ASPECTS OF UNDERGEOUND CAVERN EXCAVATION AT DINOEWIC - PART 3. A S~JDY OF BLAST VIBRATIONS, PART 1 Isaac, I D; Bubb, C Tunn Turmlg, V24, N6, July 1981, P35-41 First describes the envirommental considerations which influenced the design of the drilling and blasting patterns and how measurements were made at Dinc~wic. Discusses the criteria asst~ed far establishing ground v i b r a t i o n t ~ s m e t e T s amd how the monitored results were used to design a~i control blasts. Results a r e compared with recent work carried out in Scandinavia. 816181 E ? ~ G I ~ I N G ASPECTS OF UND~RGROUED C A V ~ EXCAVATION AT DINOEWIC - PART 2. DRYTfTNG AND BLASTING Isaac, I D; Bubb, C Tunn Tunmlg, VI3, NS, June 1981, F19-21 The general principles uf drilling amd blasting urdergrouni caverns at Dinorwic are described, shcwing how the varying techniques were adapted to meet local conditions. Typical blast patterns are illustrated, showing how they were adapted for blasting heavily Jointed rock. The influence on drilling and charging patterns of the plant used is also discussed. 816182 SPHERICAL CE~RGE CRATERING - FLANE AND ANGLE GEOMETRY INVOLVING SM~IL-SCALE ANGLE AND ROW TESTS MacLachlan, R R; Salrmm, D E; Barclay~ R J CIM Bull, V74, N829, May 1981, P81-85 The ~est objectives were: (i) to observe the c h a ~ e in single-charge cratering perfc~,,a~e between plane-surface and angle geometry, (2) to ideztify the optimum perfcm~ance of single charges cratering to a plane surface, craterimg from a bench sub-grade position and cratering from a condition of zero sub-grade or stope wall geometry, and (3) to observe the performamce of row-of-charges craterizg to an angular surface at various row burials and spacing. The row charge burial and spacing dimensions were to be expressed in simple ~merical multiples of single-charge depth-of-burial data. 816183 SWEDISH CAUTIOUS BLAST EXCAVATION AT TEE C S ~ 0NVI TEST SITE IN COLORADO Holmberg, R; HusTAnllid, W Swedish Detonic Research Foundation, Report DS 1981:1, 16 Feb 19@1, ZIP Describes the excavation of a test roam at the Colorado School of Mines Experimental Mine in Idaho Springs, Colorado, utillslng the techniques of Presplitting ani smooth blasting. Avail: The Foundation, Box 32058, S-126 ll, Stockholm, Sweden 816181~ NUMERICAL INVESTIGATION OF A METHOD FOR STRESS WAVE M E A ~ IN ROCK Cooper, T; BJarmholt, G Swedish Detonlc Research Foundation~ Report DS 1981:2, 7 AprCI 1981, 16P
An alternative to strain gauge methods for measuring stress waves in rock is to measure the res~orme in a water filled borshole. A Lagr~nglan finite difference computer code has been used to investigate the difficulties associated with the me~cd. An idealized plane strain case (infinitely long horehcle) has been studied. Curves for pressure amd particle velocity versus time in the borehole are cc~pared with the corresponding curves on the original stress wave. The ccm~tations show that the method is feasible for measuring the peak pressure of the stress wave. Auth. Avail: The Foundation, Box 32058, S-126 ii, Stockholm, Sweden
816189 PROBABILITY
OF FLYROCK Lunibcrg, N Swedish Detonic Research Fourdation, Report DS 1981:9, 23 April 1981, 39P
Reports model tests, half scale amd full scale blasting tests, amd calculates maxim~n throw and probability of hit by flyrock. Reports observations during a number of production roumds at various sites in Sweden. Avail: The Four,i%tion, Box 32058, S-126 ll, Stockholm, Sweden
816186 NUMERICAL MODELLING OF AN EXPLOS.~fE CHARGE IN A BOREHCLE Cooper, T Swedish Detonic Research Foundation, Report DS 1980:1, 7 Feb 1980, 15P Avail: The Foundation~ Box 32058, S-126 Ii, Stockholm, Sweden
Crushing and grinding 816187 AUTOGENOUS ATIg/rION MICROGRINDING OF CALCIUM CARBONATE MINERALS Hansen, J P; Davis, E G; S,,11~v~_n, G V US Bureau of Mines report RI 8503, 1981, 15P Avail: USEM, 4800 Forbes Avenue, Pittsburgh, Fa, 15213 USA 816188 COMMINUTION BY THE ATTRITION GRINDING PROCESS Stanczyk, H; Feld, I L US Bureau of Mines Bulletin B670 , 1980, 43P The process involves the intense agitation of a slurry composed of the material to be ground, a granular griniimg medit~n and a suspe~iing fluid. Research has shown th~ process to be feasible for a variety of materials. Avail: Su;erinte~ient of Documents, USGPO, Washington, DC, 20402 USA
Cutting 816189 %q~RATORY CUTIING OF BRCXCN C0~l. TECHNICAL NCTE Gottlieb, L; Moore, P J Int J Rock Mech Min Scl, VIS, ~ , Aug 1981, F335-339
130A
The cutting of brown coal by bucket wheel excavators has been simulated in the laboratory by the use of an apparatus incorporating a small cutting tooth. This introdmctory pilot testing programme has indicated that the effect of vibrating the cutting tooth is to cause a reduction in the magnitude of the cu~tting force.
This report presents the results of an investiEation of inclined roof bolts, anchored over pillars, in room-and-pillar coal mines susceptible to shear failures of the roof. ~Ithough the field data do not support this contention, it is believed on the basis of analyses and other work that inclined roof bolts do offer potential under some circumstances. Auth.
Rock and Soil Improvement Techniques
Avail: NTIS, Springfield, Va, 22161 USA (FB 80-167h30 )
Bolts and anchors See also: 816127 816190 ANALYSIS OF ROCK BOLTING TO PREVENT SHEAR ~ S T IN F R A ~ GROUND Haasl C J Min Emgng, V33j ~ , June 1981, P6~8-70~ Reports arzl discusses lab tests on srtlfielal fract~es of varying r o ~ s s and varying ar~ between the bolt and the al~lled shear force.
•
Summarises the results of investigation into the ~ffect of initial stress az~ the stress changes taklr~ place at the anchorage horizon on roof bolts. In the laboratory h~irostatlc stress fields were induced and bolt load loss with time observed. s~atlstical analysis of data shewed that the stress field at the anchcr~e horizon has a considerable influence on mine roof bolts, ie the higher the stress level, the higher the anchorage efficiency. 816192 INORGANIC C ~ FOR MINE ROOF-BOLT GROOvfING Simpson, R E; Fraley, J E; Cox, D Jl US Bureau of Mines relxm't RI 8494, 980, 32P Relx~-ts tests of inorganic cements to replace resin grouts at a lower cost whilst rets/ning the advantages of a grouted bolt. An al;hagypsum cement, accelerated with ;~f~asailmm sull~hate, was selected as the best material, with adequate pull stremgth at a d e s i r e d s e t time of less than 5 minutes and was r e ~ ! ~ available.
816193 DEVELOFMEN~ OF A DUAL-BOGM SEMI-AUTOMATED ROOF BOLTER Hellar, C; Elliott, W; Hamilton, D US Bureau of Mines repert OFR 28-80, 31 Aug
1979,
49F
Avail: NTIS, S~rim6field, Va, 22161 USA (FB 80-i~8793 ) 816194 EFFECTIVENESS OF INCLINED ROOF BOLTS IN COAL MINES Sis@h, M M US Bureau of Mines report OFR hO-80, July
1978, i15~
OF A CABLE BOnTI~G ~OGRA~ ~ TH~
CON MINE Cassldy, K In: Undergrottnd Rock Engineering (Papers to 13t~h Cznsdlan Rock Mechanics Symposium, Toronto, 28-29 May 1980), P67-72. Publ Montreal: CIM~, 1980 Describes the existing grotund conditions, cable bolt design consid~atior~, and installation of the bolt at Con Mine, North West Territory, Canada.
816191 EFFECT OF IN SITU STRESSES ON THE STABILITY OF MINE ROOF BOLTS De Ls Cruz, R V; Mulkey, J R Min Er~ng, V32, Ne, Aug 1980, P1269-1272
Avail: USBM, 4800 Forbes Avenue, Pittsburgh, Fa, 15213 USA
816195 ~ A T I O N
816196 LABORATORY AND FIELD EVALUATION OF THE BONDING STRENDTH OF G R ~ ROCK ANCHORS Balllvy, G; DUpuis, M In: Underground Rock Engineering (Papers to 13th Canadian Rock Mechanics Symposium, Tcrozfco, 28-29 May 1980), P97-102. Publ Montreal: CIMM, 1980 Describes laboratory pullout tests conducted on limestones and shales to evaluate the bording strer4~th of grouted rock anchors. Compares the results to values obtained with existing formulae and in situ pullout tests.
Soil stabilisation 816197 SOIL STABILIZATION WITH FRE}~.J~TER FINES. TECHNICAL NOTE Bandyopadhyay, S S J GeOteCh Emg~g Div ASCE, VI07, NGTS, May
1981, P65~-658 Reports a s e r i e s of lab tests on selected subgrade soils showimg that the addition of preheater fines (a by-product from cement marmfacture) gemmrally results in decreased plasticity index and swelling and increased strength.
Freezing 816198 0SLO RAIL TUNNEL TURNS TO FBEEZIEG TO SAVE HISTORIC BUILDINGS Josamg, T Tunn Tunnlg, V!3, NS, June 1981, P26-28 Demcrlbes the use of freezim6 on a samdy gravel soll above a railway tunnel excavation in 0slo.
Site Investigation aM Field Observation 816199 REMOTE SENSING IN GEOLOGY Siegal, B; Gillespie, A R New York: Wiley, 1980, 702P