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Creation and stability of large sized openings in salt
30A
782055 EXPERIENCE WITH SHAFt BORING AND NEW DEVELOPMEN~S IN GERMAN COAL MINES Bruemmer, K H; Wollers, K Proc Rapid Excavation and Tunnellirg Conference, Las Vegas, I~-17 June 1976, P126-147
782050 PREEXCAVATZON ~ H O L E STRESS M E A ~ N T S FOR DESIGN OF U~D~GROUND C H A M P S - CASE HISTORIES Haimson, B C Proc Rapid Excavation and Tunnelling Conference, Las Vegas, 14-17 June 1976, B699-714 LOng before excavation begins, the in situ stresses in the horizon of planned underground chambers can be measured by employing the hydrofracturing technique in existing exploratory holes. Such measurements produce the stress magnitudes and directions required. Two recent case histories are cited in which preexcavation stress measurements for the design of underground powerhouses proved very beneficial in the orientation of the chambers and the estimation of the stability and required support. A third stress measurement case is related to the preexcavation design of tunnels that will house doughrmt- shaped superconductive magnets for the storage of electric energy. In all cases, expensive later modifications were probably prevented by measuring stresses early in the design stage.
782051 NEW IN SITU INSTRL~4ENTATION TECHNIQUE FOR TUNNELING AND MINING DESIGN: FIELD EXAMPLES Serata, S; lwasaki, Y; Mochida, Y Proc Rapid Excavation and Tunnelling Conference, Las Vegas, 14-17 June 1976, P722-7~1 A new comI~ehensive insitu ir.=trumentation technique named the RCC Method has been developed for rapid assessment ard improv~nent of the structural stability of underground openings. When applied to tunnel construction, the degree of present and prospective safety of underground openings can be determined in quantitative terms within l0 %o 20 minutes of microcreep o~servation. When applied to miuing, roofs and floors can be stabilized by controlling the stress conditions. This stress control method has eliminated the need for intensive roof bolting and extensive floor renewal in all cases where it was applied. Use of this technique is illustrated by field examples from the Seikan Undersea Tunnel of J~pan and deep potash mining in Canada. Auth.
Mines 782052 ROCK FALLS IN COAL MINES - CAN ANYTHING ~ Compressed Air, V82, NT, July 1977, P23
DONE
Briefly considers the possibility of waterl~oofing shales in coal mine roafs. 782053 SLICE WORKING OF THICK SEAMS AS A FUNCTION OF ROCK
mEssum~ (IN RUSS~) Grapanovich, L N Ugol, 752, N2, Feb 1977, P9-14 A method of thick seam working is described in which the coal is removed by inclined slices and the waste caved. Measurements have been made of changes in strata pressure in relation to face l e r ~ anl progress of winning. This method of werkimg is not suitable for seams inclined at a r i e s greater than 35 deg or more than 350m deep. 782054 ~ SINKING CHNOI/)GY AND THE FUTURE N~M~S OF THE MINING INDUSTRY Wilson, J W Proc Rapid Excavation and Tunnelling Conference, Las Vegas, 14-17 June 1976, P103-125
782056 BOREHOLE HOISTING FOR SHAFT SINKING AND DEVELOPMENT AT BRUNSWICK MINING AND sMELTING CORPORATION LIMITED, BATHURST, NEW BRUNSWICK Dengler, W R; Brown, R S Proc Rapid Excavation and Tunnelling Conference, Las Vegas, 14-17 June 1976, P169-182 Describes the 26ft diameter 4525ft deep shaft, constructed by raise boring methods. 782057 APPLICATION OF TUNNEL BORING MACHINES TO COAL MINE ENTRY DEVELOPMENT Uthus, D B; Crocker, T J Proc Rapid Excavation and Tumrelling Conference, Las Vegas~ 14-17 June 1976, P185-212 Discusses European and US experience and attempts to define the requirements for tunnelling machines in this area. 782058 CONSTRUCTION OF LARGE UNDERGROUND EXCAVATIONS IN ARIZONA C O F F ~ MINES Hynd, J G S; Clelland, I S; Gillett, P A Proc Rapid Excavation and Tunnelling Conference, Las Vegas, 14-17 June 1976, P570-590 Describes 2 recently completed projects, a rotary dump-ore poaket-sre pass complex and the main station level in a 2-station-loadi.ng pocket-ore pass complex. 782059 CREATION AND STABILITY OF LARGE S I ~ D ~:~ENI~3 IN SALT JacoSy, C H Proc Rapid Excavation a~i T u ~ i l i n ~ Conference, Las Vegas, 14-17 J ~ 1976j P591-608 782060 STEREOGRAPHIC METHOD OF D~."I'~MI~ ~ q ~ E R PLANES OF WEAKk~SS TPJ~NSECT PILLARS Touseull 5 J A USBM RI 8232, 1977, 17P ~n~hemethod can deal with both single and intersecting planes in vertical pillars of parallel symnetry a_~d determdne whether they trar~ect the full horizontal cross-section of the piilsr. It has been found that intersecting planes of weakness can transect the fu3_l cross section even though, the individual planes do not. The report gives instructions for use of the method. Avail: US~M, 4800 Forbes Ave, Pittsburgh, Pa, 15213, USA 782061 MINE SIMULATION COURSE NOTES Elbrond, J; ChatterJee, P K Adelaide : Australian Mir~ral Foundation Inc, 1977, II6P -
Deals with the subject in the following sections: relation between model and reality, simulation, composition of time sand perfc~mace of mschlnes, some elements of queuing theory, graphical (manual) simulations, guidelines for data analysis, computer program- structure and concepts, GPSS and Fortran programs for simulation, procedure for calculation of capacity of an open pit operation, the machinesurge bin-machine problem, procedure for calculation of cycle time of trains on a sirgle track railroad.
782055 EXPERIENCE WITH SHAFt BORING AND NEW DEVELOPMEN~S IN GERMAN COAL MINES Bruemmer, K H; Wollers, K Proc Rapid Excavation and Tunnellirg Conference, Las Vegas, I~-17 June 1976, P126-147
782050 PREEXCAVATZON ~ H O L E STRESS M E A ~ N T S FOR DESIGN OF U~D~GROUND C H A M P S - CASE HISTORIES Haimson, B C Proc Rapid Excavation and Tunnelling Conference, Las Vegas, 14-17 June 1976, B699-714 LOng before excavation begins, the in situ stresses in the horizon of planned underground chambers can be measured by employing the hydrofracturing technique in existing exploratory holes. Such measurements produce the stress magnitudes and directions required. Two recent case histories are cited in which preexcavation stress measurements for the design of underground powerhouses proved very beneficial in the orientation of the chambers and the estimation of the stability and required support. A third stress measurement case is related to the preexcavation design of tunnels that will house doughrmt- shaped superconductive magnets for the storage of electric energy. In all cases, expensive later modifications were probably prevented by measuring stresses early in the design stage.
782051 NEW IN SITU INSTRL~4ENTATION TECHNIQUE FOR TUNNELING AND MINING DESIGN: FIELD EXAMPLES Serata, S; lwasaki, Y; Mochida, Y Proc Rapid Excavation and Tunnelling Conference, Las Vegas, 14-17 June 1976, P722-7~1 A new comI~ehensive insitu ir.=trumentation technique named the RCC Method has been developed for rapid assessment ard improv~nent of the structural stability of underground openings. When applied to tunnel construction, the degree of present and prospective safety of underground openings can be determined in quantitative terms within l0 %o 20 minutes of microcreep o~servation. When applied to miuing, roofs and floors can be stabilized by controlling the stress conditions. This stress control method has eliminated the need for intensive roof bolting and extensive floor renewal in all cases where it was applied. Use of this technique is illustrated by field examples from the Seikan Undersea Tunnel of J~pan and deep potash mining in Canada. Auth.
Mines 782052 ROCK FALLS IN COAL MINES - CAN ANYTHING ~ Compressed Air, V82, NT, July 1977, P23
DONE
Briefly considers the possibility of waterl~oofing shales in coal mine roafs. 782053 SLICE WORKING OF THICK SEAMS AS A FUNCTION OF ROCK
mEssum~ (IN RUSS~) Grapanovich, L N Ugol, 752, N2, Feb 1977, P9-14 A method of thick seam working is described in which the coal is removed by inclined slices and the waste caved. Measurements have been made of changes in strata pressure in relation to face l e r ~ anl progress of winning. This method of werkimg is not suitable for seams inclined at a r i e s greater than 35 deg or more than 350m deep. 782054 ~ SINKING CHNOI/)GY AND THE FUTURE N~M~S OF THE MINING INDUSTRY Wilson, J W Proc Rapid Excavation and Tunnelling Conference, Las Vegas, 14-17 June 1976, P103-125
782056 BOREHOLE HOISTING FOR SHAFT SINKING AND DEVELOPMENT AT BRUNSWICK MINING AND sMELTING CORPORATION LIMITED, BATHURST, NEW BRUNSWICK Dengler, W R; Brown, R S Proc Rapid Excavation and Tunnelling Conference, Las Vegas, 14-17 June 1976, P169-182 Describes the 26ft diameter 4525ft deep shaft, constructed by raise boring methods. 782057 APPLICATION OF TUNNEL BORING MACHINES TO COAL MINE ENTRY DEVELOPMENT Uthus, D B; Crocker, T J Proc Rapid Excavation and Tumrelling Conference, Las Vegas~ 14-17 June 1976, P185-212 Discusses European and US experience and attempts to define the requirements for tunnelling machines in this area. 782058 CONSTRUCTION OF LARGE UNDERGROUND EXCAVATIONS IN ARIZONA C O F F ~ MINES Hynd, J G S; Clelland, I S; Gillett, P A Proc Rapid Excavation and Tunnelling Conference, Las Vegas, 14-17 June 1976, P570-590 Describes 2 recently completed projects, a rotary dump-ore poaket-sre pass complex and the main station level in a 2-station-loadi.ng pocket-ore pass complex. 782059 CREATION AND STABILITY OF LARGE S I ~ D ~:~ENI~3 IN SALT JacoSy, C H Proc Rapid Excavation a~i T u ~ i l i n ~ Conference, Las Vegas, 14-17 J ~ 1976j P591-608 782060 STEREOGRAPHIC METHOD OF D~."I'~MI~ ~ q ~ E R PLANES OF WEAKk~SS TPJ~NSECT PILLARS Touseull 5 J A USBM RI 8232, 1977, 17P ~n~hemethod can deal with both single and intersecting planes in vertical pillars of parallel symnetry a_~d determdne whether they trar~ect the full horizontal cross-section of the piilsr. It has been found that intersecting planes of weakness can transect the fu3_l cross section even though, the individual planes do not. The report gives instructions for use of the method. Avail: US~M, 4800 Forbes Ave, Pittsburgh, Pa, 15213, USA 782061 MINE SIMULATION COURSE NOTES Elbrond, J; ChatterJee, P K Adelaide : Australian Mir~ral Foundation Inc, 1977, II6P -
Deals with the subject in the following sections: relation between model and reality, simulation, composition of time sand perfc~mace of mschlnes, some elements of queuing theory, graphical (manual) simulations, guidelines for data analysis, computer program- structure and concepts, GPSS and Fortran programs for simulation, procedure for calculation of capacity of an open pit operation, the machinesurge bin-machine problem, procedure for calculation of cycle time of trains on a sirgle track railroad.