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Novel methods of rock fracture
90A
PROCEED.2 CO~GBESS, INgERNAT.SOC.ROCK MECH.HELGRAD, 1970,V~, 1974, P301"304. The writer discusses the type of materials which ahould be employed for models. The materials should be of high deformability with characteristics which cca~respor~ to those of the prototype, especially from the point of view of elasticity vlsco-plasticity and ~roneness to rupture. The study on model materials at ISMES revealed that the best model material is a mixture of powered limestone, barite amd concrete in epcxo-resin emulsified and diluted in enough water to humldize the powders~ (Rda~tion of glycerine is sometimes helpful).
Comminution of Rocks
852 MARX, C Evaluation of the diamond drilling process. Figs, Tabls,Refs. INDUST.DIAM.REV. NOV. 197B, P421-429. Prompted by am earlier article by K. Spink~evaluation criteria for the diamond drilling process were studied compared with the results given by Spink While a general agreement with the approach, gemeral viewpoints and presentation can be stated, different opinions exist with respect to bit design, interl~etation of the test results stud importance of the specific energy figures as an evaltla~ion criterion; For effective drilling with diamond bits u r ~ the objective of balancing high penetration rate and low bit wear, operational conditions are needed which go considerably above the capacity of the test machine used by Spink. New test data for surface-set and impregnated bits are presented arzl discussed. The tests were run under controlled coniltions using 3 different rock types. Auth.
847 MORRI S,AH
MOORE,K RODFC~D, IG Impact ripping - a s u r v e y o f experience to date. Figs,Tabls, MIN •ENGR •NOV. 1973~P93- i04. The history of National Coal Board ur~lergrour~ experience gained with MEDE axzl marm~acturers equipment is presented, incorporating various hydraulically operated impact units, fsr application at rippimgs sad half-headlr4 systems. The installations, equipment used and the overall performance are described. LUUKE,WN Novel methods of rock fracture; Figs,Refs. MIN. COI~..RESS J.V59,AUG. 1973, P64-69. Investigations into the use of lasers and high pressure water Jets for their rock breaking potential by the Department of TrazmlXm%ation in Washington a r e relx~r~ed,
Drilling 849 MOTORNEZ~4D,AP MAKASHOV, LN SAKOVICH,MG Technical and econcmic irdlces and suggestions for using ABU-1 drilling equipment in permafrost. In Russian. 2F. STROITELNYE I DOROZHNYE MASHINY, N6.JUNE,1973,P35-36.
850 RAZL~OV, GA REBRIK, BM SHVETSOV, VM Calculation of core-drilling regimes for engineering and geological exploration wells, drilled in permafrost without circulating fluids. In Russian. 2F, 3R. • IZV .VYSSH.UUHEB. ZAVED. GEOL. RAZV~, N6,JUNE, 1973, P159-163.
Blasting 853 CHOUDURI, SK A review of development of high explosive industry for mining in India.-Products marketed by three main Imdlan high explosive manufacturers are described in detail; Tabls,Refs. J.MINES METALS FUELS,V22,FEB.1973,P41-45.
Cutting 854 ABEZGAUZ, VD Optional resistance of soil and rock working tools. US ABMY, CORPS ENGRS.COLD REG.RES.N.H.REP.TL 407,
1973,8P. The factors that influence the choice of operating time of a cutting tool before its replacement, i.e. tool stremgthjere examined amd the operating cycle of the machine as the sum of time ses~nts spent on productive work before cutter replacement and as the time spent on replacing worn cutters is defined.
Rock and soil improvement techniques See also abstract: 832.
Grouting and freezing 855 ANONYMOUS
851 HEP/MANN, S Drilling and blasting holes during driving of gateroads ueing double scraper loaders and Jumbos with booms; In German. GLUCKAUF, VI09, NIg, 13 SEP~.lg'(3,P944- 947. Details are given of the tests carried out at Friedrich Helrmlch Colliery using rotary-percussive drilling machines;
Cement groutir6 externalsmine l~Oductivlty:-Operations at mines in the North East coalfield, east of Durham, Great Britain; 1R. COLLIERY GUARD.V222, N1,1974, P29-31.
856 ANONYMOUS Cement grouting in U.K. undersea cos& mines; 3F, 2R.
PROCEED.2 CO~GBESS, INgERNAT.SOC.ROCK MECH.HELGRAD, 1970,V~, 1974, P301"304. The writer discusses the type of materials which ahould be employed for models. The materials should be of high deformability with characteristics which cca~respor~ to those of the prototype, especially from the point of view of elasticity vlsco-plasticity and ~roneness to rupture. The study on model materials at ISMES revealed that the best model material is a mixture of powered limestone, barite amd concrete in epcxo-resin emulsified and diluted in enough water to humldize the powders~ (Rda~tion of glycerine is sometimes helpful).
Comminution of Rocks
852 MARX, C Evaluation of the diamond drilling process. Figs, Tabls,Refs. INDUST.DIAM.REV. NOV. 197B, P421-429. Prompted by am earlier article by K. Spink~evaluation criteria for the diamond drilling process were studied compared with the results given by Spink While a general agreement with the approach, gemeral viewpoints and presentation can be stated, different opinions exist with respect to bit design, interl~etation of the test results stud importance of the specific energy figures as an evaltla~ion criterion; For effective drilling with diamond bits u r ~ the objective of balancing high penetration rate and low bit wear, operational conditions are needed which go considerably above the capacity of the test machine used by Spink. New test data for surface-set and impregnated bits are presented arzl discussed. The tests were run under controlled coniltions using 3 different rock types. Auth.
847 MORRI S,AH
MOORE,K RODFC~D, IG Impact ripping - a s u r v e y o f experience to date. Figs,Tabls, MIN •ENGR •NOV. 1973~P93- i04. The history of National Coal Board ur~lergrour~ experience gained with MEDE axzl marm~acturers equipment is presented, incorporating various hydraulically operated impact units, fsr application at rippimgs sad half-headlr4 systems. The installations, equipment used and the overall performance are described. LUUKE,WN Novel methods of rock fracture; Figs,Refs. MIN. COI~..RESS J.V59,AUG. 1973, P64-69. Investigations into the use of lasers and high pressure water Jets for their rock breaking potential by the Department of TrazmlXm%ation in Washington a r e relx~r~ed,
Drilling 849 MOTORNEZ~4D,AP MAKASHOV, LN SAKOVICH,MG Technical and econcmic irdlces and suggestions for using ABU-1 drilling equipment in permafrost. In Russian. 2F. STROITELNYE I DOROZHNYE MASHINY, N6.JUNE,1973,P35-36.
850 RAZL~OV, GA REBRIK, BM SHVETSOV, VM Calculation of core-drilling regimes for engineering and geological exploration wells, drilled in permafrost without circulating fluids. In Russian. 2F, 3R. • IZV .VYSSH.UUHEB. ZAVED. GEOL. RAZV~, N6,JUNE, 1973, P159-163.
Blasting 853 CHOUDURI, SK A review of development of high explosive industry for mining in India.-Products marketed by three main Imdlan high explosive manufacturers are described in detail; Tabls,Refs. J.MINES METALS FUELS,V22,FEB.1973,P41-45.
Cutting 854 ABEZGAUZ, VD Optional resistance of soil and rock working tools. US ABMY, CORPS ENGRS.COLD REG.RES.N.H.REP.TL 407,
1973,8P. The factors that influence the choice of operating time of a cutting tool before its replacement, i.e. tool stremgthjere examined amd the operating cycle of the machine as the sum of time ses~nts spent on productive work before cutter replacement and as the time spent on replacing worn cutters is defined.
Rock and soil improvement techniques See also abstract: 832.
Grouting and freezing 855 ANONYMOUS
851 HEP/MANN, S Drilling and blasting holes during driving of gateroads ueing double scraper loaders and Jumbos with booms; In German. GLUCKAUF, VI09, NIg, 13 SEP~.lg'(3,P944- 947. Details are given of the tests carried out at Friedrich Helrmlch Colliery using rotary-percussive drilling machines;
Cement groutir6 externalsmine l~Oductivlty:-Operations at mines in the North East coalfield, east of Durham, Great Britain; 1R. COLLIERY GUARD.V222, N1,1974, P29-31.
856 ANONYMOUS Cement grouting in U.K. undersea cos& mines; 3F, 2R.