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Investigation into blasting design for mining excavations
891221 Concepts in computer aided mine design and planning Brown, D J; Ashton, A R; Croghan, J A; Johnson, S M Mh Sci Tecknol V7, NI, May 1988, P99-119
891225 Downhole solids control: a new theory and field practice Hayatdavoudi, A SPE Drilling Engng V3. Nl. March 1988. P57-62
Work undertaken by Nottingham University to develop a modular computer aided mine design and planning system is presented. The NUmine database and its graphics capabilities are described. Sections on simulation, modelling, computerised visibility structures and expert systems are included.
The effects of total solids content on size distribution of cuttings and the penetration rate of the insert bit in hard rock and shale drilling were investigated. A new ‘power index’ theory, relating cutting size to total power input to the rock, hydraulics of a solids separator and a hydraulic grinding index, is presented.
Rock Breakage and Excavation Drilling 891222 General view of drilling operations in underground and opencast coal and metal minea in Turkey Bilgin, N GeoaWing VSO, June 1988, P9-12 The use of percussive drills as a tool to predict rock properties was investigated. Drillability tests in 12 mine roadways were supplemented by laboratory tests on samples from these sites to determine rock mechanical properties. Certain rock properties showed a relation to drill bit penetration rates and were used to develop predictor equations. A statistical analysis of cutting test results showed that cutting specific energy was closely related to percussive drilling rate. Development of the investigation has allowed prediction of boom type tunnelling machine advance rates.
891223 Recent development in drilling techniques for coal exploration Chattopadhyay, T; Krishna, R J Min Met Fuels V36, N4, April 1988, P187-190 Rock drilling is important in exploration for new coal reserves, but problems are encountered due to friability, fracturing and softness of the soil. Developments in modern equipment, drill bits (for increased penetration rate and extented bit life), corebarrels, wireline and drill rods, are described using results from published research. The concept of Measurement While Drilling is introduced.
891224 Williiton b&n: an analysis of salt drilling techniques for brine-based drilling-fluid systems Stash, S M; Jones, M E SPE Drilhg Eagng V3, NI, March 1988. P19-32 Drilling in the Williston basin salt intervals is complicated by widespread casing collapse because of the plastic movement of evaporites and the subsequent point loading of the casing. A 2 year study was undertaken to establish rheological and mechanical guidelines for the drilling of salts, whether a saturated brine-mud or an oil-invert-emulsion drilling fluid was used. This indicated that erosion of the salt intervals was a function of not only salt dissolution but also the mechanical action of turbulent flow in the wellbore. A laminar flow regime can be real&d and salt enlargement limited by careful control of annular flow rate. jet velocity and drilling-fluid rheology. 0
891226 DrllUng model for young offshore Louisiana and Texas trends Smalling, DA; Myers, R L SPE Drilfing Engag V3. N2. June 1988, P141-152
A model to aid in planning and drilling of young offshore Louisiana and Texas wells is presented. The model uses a set of equations to predict results of modifications in rotary speed, bit hydraulics, bit diameter and differential pressure. Drillability trends are introduced which predict formation hardness according to location, depth and formation type. Two applications are discussed. Firstly the model is used to simulate bit runs through projected sand and shale sequences, and secondly for computing drillability. 891227 Eflect of rock-bit iateraction on hole direction in deep hole drilling Rabia, H; Choi, W G Proc CARE 88 (Coaf~eace on Appiied Rock Eagiaeeriag), Newcastle, 6-8 January 1988 PI 75-182. Pub1 London: IMM, I988 Accurate prediction of drill-hole direction requires knowledge of drill string mechanics and formation factors, such as dip, hardness and anisotropy. A simple method to determine a formation factor index for various angles of dip and rock hardness is presented, and combined with mechanical factors derived from beam-column theory to predict drilling direction. A numerical example is used to illustrate the technique.
Blasting See also: 891323 891228 Blasting (In French) lndustrie Miaerale
V70. N3. June 1988, 16OP
A review of the use of explosives in engineering projects is presented. The principles of explosives above and below ground, and problems such as vibration and misfire, are outlined. Case studies for public works, underground coal mines and other underground mines are described. 891229 Investigation into blasting d&gn for a excavations Afrouz, A; Hassani. F P; Ucar, R Min Sci TectuoI V7, NI, May 1988. P45-62 Bieniawski’s rock mass rating and Hoek and Brown’s failure criterion were used to evaluate the blastability of rock in relation to its specific explosive consumption and the rock strength parameters. A new method is then developed to determine the diameter of the blasthole, burden, spacing between holes, weight of explosive and blast design. Empirical equations to determine the amount of explosive per blasthole under various surface and underground mining conditions are proposed.
1989 Pergamon Press pk. Reproduction
not permitted
891225 Downhole solids control: a new theory and field practice Hayatdavoudi, A SPE Drilling Engng V3. Nl. March 1988. P57-62
Work undertaken by Nottingham University to develop a modular computer aided mine design and planning system is presented. The NUmine database and its graphics capabilities are described. Sections on simulation, modelling, computerised visibility structures and expert systems are included.
The effects of total solids content on size distribution of cuttings and the penetration rate of the insert bit in hard rock and shale drilling were investigated. A new ‘power index’ theory, relating cutting size to total power input to the rock, hydraulics of a solids separator and a hydraulic grinding index, is presented.
Rock Breakage and Excavation Drilling 891222 General view of drilling operations in underground and opencast coal and metal minea in Turkey Bilgin, N GeoaWing VSO, June 1988, P9-12 The use of percussive drills as a tool to predict rock properties was investigated. Drillability tests in 12 mine roadways were supplemented by laboratory tests on samples from these sites to determine rock mechanical properties. Certain rock properties showed a relation to drill bit penetration rates and were used to develop predictor equations. A statistical analysis of cutting test results showed that cutting specific energy was closely related to percussive drilling rate. Development of the investigation has allowed prediction of boom type tunnelling machine advance rates.
891223 Recent development in drilling techniques for coal exploration Chattopadhyay, T; Krishna, R J Min Met Fuels V36, N4, April 1988, P187-190 Rock drilling is important in exploration for new coal reserves, but problems are encountered due to friability, fracturing and softness of the soil. Developments in modern equipment, drill bits (for increased penetration rate and extented bit life), corebarrels, wireline and drill rods, are described using results from published research. The concept of Measurement While Drilling is introduced.
891224 Williiton b&n: an analysis of salt drilling techniques for brine-based drilling-fluid systems Stash, S M; Jones, M E SPE Drilhg Eagng V3, NI, March 1988. P19-32 Drilling in the Williston basin salt intervals is complicated by widespread casing collapse because of the plastic movement of evaporites and the subsequent point loading of the casing. A 2 year study was undertaken to establish rheological and mechanical guidelines for the drilling of salts, whether a saturated brine-mud or an oil-invert-emulsion drilling fluid was used. This indicated that erosion of the salt intervals was a function of not only salt dissolution but also the mechanical action of turbulent flow in the wellbore. A laminar flow regime can be real&d and salt enlargement limited by careful control of annular flow rate. jet velocity and drilling-fluid rheology. 0
891226 DrllUng model for young offshore Louisiana and Texas trends Smalling, DA; Myers, R L SPE Drilfing Engag V3. N2. June 1988, P141-152
A model to aid in planning and drilling of young offshore Louisiana and Texas wells is presented. The model uses a set of equations to predict results of modifications in rotary speed, bit hydraulics, bit diameter and differential pressure. Drillability trends are introduced which predict formation hardness according to location, depth and formation type. Two applications are discussed. Firstly the model is used to simulate bit runs through projected sand and shale sequences, and secondly for computing drillability. 891227 Eflect of rock-bit iateraction on hole direction in deep hole drilling Rabia, H; Choi, W G Proc CARE 88 (Coaf~eace on Appiied Rock Eagiaeeriag), Newcastle, 6-8 January 1988 PI 75-182. Pub1 London: IMM, I988 Accurate prediction of drill-hole direction requires knowledge of drill string mechanics and formation factors, such as dip, hardness and anisotropy. A simple method to determine a formation factor index for various angles of dip and rock hardness is presented, and combined with mechanical factors derived from beam-column theory to predict drilling direction. A numerical example is used to illustrate the technique.
Blasting See also: 891323 891228 Blasting (In French) lndustrie Miaerale
V70. N3. June 1988, 16OP
A review of the use of explosives in engineering projects is presented. The principles of explosives above and below ground, and problems such as vibration and misfire, are outlined. Case studies for public works, underground coal mines and other underground mines are described. 891229 Investigation into blasting d&gn for a excavations Afrouz, A; Hassani. F P; Ucar, R Min Sci TectuoI V7, NI, May 1988. P45-62 Bieniawski’s rock mass rating and Hoek and Brown’s failure criterion were used to evaluate the blastability of rock in relation to its specific explosive consumption and the rock strength parameters. A new method is then developed to determine the diameter of the blasthole, burden, spacing between holes, weight of explosive and blast design. Empirical equations to determine the amount of explosive per blasthole under various surface and underground mining conditions are proposed.
1989 Pergamon Press pk. Reproduction
not permitted