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Design and planning for multi-seam mining
56A
911436 Geologic classification and modemngof potential roof control problems in underground coal mines Greb, S F; Cobb, J C Proc 1989 Multinational Conference on Mite Planning and Design, Lexitgton,23-26 May 1989 P27-32. Publ Lexington: OES Publications, 1989
911440 Induced caving n~thod applkd at the St Thomas II mine of Philex Mining Corporation Retardo, N S; Buada, E R; Basa, R B; Lapniten, D G Proc M M I J / I M M Johtt Symposium, Today's Technology for the Mining and Metallurgical Industries, Kyoto, 2-4 October 1989 P251-260. Pubi London: MMIJ/IMM, 1989
Accurate classification and modelling of potential roof-control problems can aid in the planning, design, and development of coal mines. The ability of rocks to support the roof of an underground coal mine depends on lateral and vertical changes in rock type, shape, and bedding of the roof, seam and floor. Observations of roof falls, data from published references, and conversations with mine inspectors and mine personnel which led to the classification of eight common types of roof falls in the Eastern Kentucky coal field are discussed.
Philex has successfully been employing conventional block caving for the past 28 years. As mining progressed downwards, some changes in the ore characteristics were noticed. Investigations in the use of several induced caving methods and the in-the-hole drilling and blasting techniques were conducted and proved effective. The development of a block by utilizing the induced caving method and the large diameter inthe-hole drilling and blasting are described.
91 ! 437 Contribution of numerical stress analysis m the room-andpillar design of a producing gold mine: a ease study Auld, G
911441 Adoption of a pneumatic caisson with automated excavation and control systems in the highly urbanized area Narihiro, A Proc International Congress on Tunnels and Water, Madrid, 15-18 June 1988 VI, P549-556. Publ Rotterdam: A ,4 Balkema, 1988
Proc 1989 Maltimational Conferemce on Mine Planning and Design, Lexington,23-26 May 1989 P33-40. Publ Lexington: OES Publications, 1989 The steps taken through a project in order to maximize the extraction of a room-and-pillar gold mine located at shallow (150 to 300m) depth are presented. Sensitivity analyses of pillar strength vs extraction ratio based on simplistic calculations incorporating lithostatic stress field estimations and classical pillar strength formulae form the first steps. The final stage comprises sophisticated computer modelling of pillars, used in conjunction with insitu stress measurements.
911438 Design and planning for multi-seam mining Zhou, Y; Haycocks, C; Forrest, P Proc 1989 Multinational Conference on Mine Planning and Design, Lexington,23-26 May 1989 P41-46. Publ Lexington: OES Publications, 1989 Interactions in multiple seam mining are governed by four basic mechanisms: load transfer, caving and arching, subsidence, and interseam failure. The complexities of mining and geological conditions often dictate the use of more than one mechanism in analyzing and quantifying specific interaction problems. Extensive research carried out in order to solve problems of interaction and ameliorate ground conditions in the seam currently being mined is discussed. Work has been conducted using both numerical and physical models combined with theoretical, statistical and empirical analyses.
911439 Influence of pack foundation on gateroad stability in soft floor conditions Kawecki, M A: Isaac, A K Minerals, Materials and Industry, Proc 14th Congress of the Council of Mining and Metallurgical Institutions, Edinburgh, 2-6 July 1990 P131-138. Publ IMM: London, 1990 Cementitious packs are used to provide support in iongwall gateroads and thus allow re-use of the gateroad to serve adjacent panels and so reduce sterilization of coal reserves. A brief review of controlled support system performance is presented. A comparison is provided between pack performance in medium strength strata and in the presence of a soft floor, and the associated failure mechanisms are identified. A mathematical approach for pack design is suggested, with an indication of its limits of application.
A system for sinking caissons in water bearing ground in urban areas with minimum disturbance has been developed in Japan. Its use in a diluvial deposit, mainly fine sands, is described. Sheet piles were first installed for surface support. The rectangular caisson was sunk in 9 vertical sections. Excavation was by an electric shovel suspended from the ceiling slab of the base section. Control, compressed air, and muck disposal facilities were isolated by air locks. Calculation of critical pneumatic pressure based on gas-liquid two phase flow is illustrated. Excavation pressures, rates, accuracy and air leakage are discussed.
General undergroundstorage 911442 Hydrocarbon storage in hard rock caverns. Part 2 Lindblom, U E TRIm Tmmlg 1/22, N6, June 1990, P71-74 Small scale LPG storage is becoming more important. Deep, unlined caverns are not economic at this scale, and fully refrigerated unlined, fully pressurised lined, or some combination of both approaches will be needed. Liner requirements are assessed in terms of strength, inertness, drainage capabilities, and cost. Liner systems based on polymers, metals, concrete,or the bentonite mud shield are described. Liquid nitrogen storage, which results in development of frozen rock or soil zones, is discussed. Areas requiring further work are outlined.
911443 Und~ground storage of hydrocarbons Goyal, K L; Kumar, M; Mittal, A K Proc iaterm~timud Symposium on Undergrnnnd Engineering, New Delhi, 14-17 April 1988 VI, P415-417. Publ Rotterdam." A A Balkema, 1988 Underground storage of liquid or gaseous hydrocarbons is used to cope with seasonal demand fluctuations. Advantages of this technique are considered. Storage in salt caverns, rock caverns, abandoned mines and in aquifers is described. Potential for storage of gases in unconsolidated and partially depleted gas sands in India is envisaged.
© 1991 Pergamon Press pic. Reproduction not permitted
911436 Geologic classification and modemngof potential roof control problems in underground coal mines Greb, S F; Cobb, J C Proc 1989 Multinational Conference on Mite Planning and Design, Lexitgton,23-26 May 1989 P27-32. Publ Lexington: OES Publications, 1989
911440 Induced caving n~thod applkd at the St Thomas II mine of Philex Mining Corporation Retardo, N S; Buada, E R; Basa, R B; Lapniten, D G Proc M M I J / I M M Johtt Symposium, Today's Technology for the Mining and Metallurgical Industries, Kyoto, 2-4 October 1989 P251-260. Pubi London: MMIJ/IMM, 1989
Accurate classification and modelling of potential roof-control problems can aid in the planning, design, and development of coal mines. The ability of rocks to support the roof of an underground coal mine depends on lateral and vertical changes in rock type, shape, and bedding of the roof, seam and floor. Observations of roof falls, data from published references, and conversations with mine inspectors and mine personnel which led to the classification of eight common types of roof falls in the Eastern Kentucky coal field are discussed.
Philex has successfully been employing conventional block caving for the past 28 years. As mining progressed downwards, some changes in the ore characteristics were noticed. Investigations in the use of several induced caving methods and the in-the-hole drilling and blasting techniques were conducted and proved effective. The development of a block by utilizing the induced caving method and the large diameter inthe-hole drilling and blasting are described.
91 ! 437 Contribution of numerical stress analysis m the room-andpillar design of a producing gold mine: a ease study Auld, G
911441 Adoption of a pneumatic caisson with automated excavation and control systems in the highly urbanized area Narihiro, A Proc International Congress on Tunnels and Water, Madrid, 15-18 June 1988 VI, P549-556. Publ Rotterdam: A ,4 Balkema, 1988
Proc 1989 Maltimational Conferemce on Mine Planning and Design, Lexington,23-26 May 1989 P33-40. Publ Lexington: OES Publications, 1989 The steps taken through a project in order to maximize the extraction of a room-and-pillar gold mine located at shallow (150 to 300m) depth are presented. Sensitivity analyses of pillar strength vs extraction ratio based on simplistic calculations incorporating lithostatic stress field estimations and classical pillar strength formulae form the first steps. The final stage comprises sophisticated computer modelling of pillars, used in conjunction with insitu stress measurements.
911438 Design and planning for multi-seam mining Zhou, Y; Haycocks, C; Forrest, P Proc 1989 Multinational Conference on Mine Planning and Design, Lexington,23-26 May 1989 P41-46. Publ Lexington: OES Publications, 1989 Interactions in multiple seam mining are governed by four basic mechanisms: load transfer, caving and arching, subsidence, and interseam failure. The complexities of mining and geological conditions often dictate the use of more than one mechanism in analyzing and quantifying specific interaction problems. Extensive research carried out in order to solve problems of interaction and ameliorate ground conditions in the seam currently being mined is discussed. Work has been conducted using both numerical and physical models combined with theoretical, statistical and empirical analyses.
911439 Influence of pack foundation on gateroad stability in soft floor conditions Kawecki, M A: Isaac, A K Minerals, Materials and Industry, Proc 14th Congress of the Council of Mining and Metallurgical Institutions, Edinburgh, 2-6 July 1990 P131-138. Publ IMM: London, 1990 Cementitious packs are used to provide support in iongwall gateroads and thus allow re-use of the gateroad to serve adjacent panels and so reduce sterilization of coal reserves. A brief review of controlled support system performance is presented. A comparison is provided between pack performance in medium strength strata and in the presence of a soft floor, and the associated failure mechanisms are identified. A mathematical approach for pack design is suggested, with an indication of its limits of application.
A system for sinking caissons in water bearing ground in urban areas with minimum disturbance has been developed in Japan. Its use in a diluvial deposit, mainly fine sands, is described. Sheet piles were first installed for surface support. The rectangular caisson was sunk in 9 vertical sections. Excavation was by an electric shovel suspended from the ceiling slab of the base section. Control, compressed air, and muck disposal facilities were isolated by air locks. Calculation of critical pneumatic pressure based on gas-liquid two phase flow is illustrated. Excavation pressures, rates, accuracy and air leakage are discussed.
General undergroundstorage 911442 Hydrocarbon storage in hard rock caverns. Part 2 Lindblom, U E TRIm Tmmlg 1/22, N6, June 1990, P71-74 Small scale LPG storage is becoming more important. Deep, unlined caverns are not economic at this scale, and fully refrigerated unlined, fully pressurised lined, or some combination of both approaches will be needed. Liner requirements are assessed in terms of strength, inertness, drainage capabilities, and cost. Liner systems based on polymers, metals, concrete,or the bentonite mud shield are described. Liquid nitrogen storage, which results in development of frozen rock or soil zones, is discussed. Areas requiring further work are outlined.
911443 Und~ground storage of hydrocarbons Goyal, K L; Kumar, M; Mittal, A K Proc iaterm~timud Symposium on Undergrnnnd Engineering, New Delhi, 14-17 April 1988 VI, P415-417. Publ Rotterdam." A A Balkema, 1988 Underground storage of liquid or gaseous hydrocarbons is used to cope with seasonal demand fluctuations. Advantages of this technique are considered. Storage in salt caverns, rock caverns, abandoned mines and in aquifers is described. Potential for storage of gases in unconsolidated and partially depleted gas sands in India is envisaged.
© 1991 Pergamon Press pic. Reproduction not permitted