- Email: [email protected]
831148 Stability behaviour of coal mining tunnels with different supports
18A
Based on past experience at Memtougou colliery and results from investigations the following conclusions were made: (i) most bumps occur at pillar areas where coal has been robbed frnm 2, 3 or 4 sides, (2) relevant factors affecting proneness to bumps are physical and mechamical properties of coal seams, geological comditions, the method of mining, entry layout ar~ firing methods. 8311~7 CONSIDESATIONS OF GAS OUTBURSTS IN USING DOME SALT MINES FOR STORAGE OF OIL AND NUCLEAR WASTE Mahtab, M A Proc ist Conference on Ground Control in Mining, Morgantown, 27-29 July 1981, ~ 0 58. Publ Morgantown: West Virginia University, 1981 Discusses gas outbursts in salt domes which are associated with an~nolous zones in the salt, depth of mining and method of excavation. It is ~roposed that gas bursts are initiated by diaking in biaxial compression and propagate by spalling of the cavity walls and further dlaking. The outburst is terminated by a combination of dilatancy hardenir6, increase in stress along the cavity axis, and enlargement of the cavity to the boundaries of the ~ e s s u r e pocket. Identification of an~nolous zones by in altu measurement of material l~operties is suggested in order to predict outburst prone zones, and shock blasting is l~roposed as a method of controlling gas bursts. 831148 o~TABILITY BEHAVIOUR OF COAL MINING TUNNELS WITH DLY~FERENT SUPPORTS Wells, B T; "~hittaker, B N Proc ist Conference on Groumd Control in Mining, Morgamtown, 27-29 July 1981, P6775. Publ Morgantown: West Virginia University, 1981 Discusses the stress fields encountered around mining tunnels. A critical review of the various analytical assessments (stress and strain analyses) of support requirements is presented. 831149 USE OF GEOLOGIC MOD,-LING IN THE PREDICTION OF ~DVERSE ROOF CONDITIONS Custer, E S; Gaddy, F L Proc Ist Conference on Ground Control in Mining, Morgantcwn, 27-29 July 1981, P167173. Publ Morgantc~n: West Virginia University, !981 Recent investigations of mine roof falls have demonstrated that roof failures are generally associated with geologic conlitions. The roof falls can be predicted by using techniques of depositional modelling for the coal bed and roof rocks, and by lineament analysis. The ability to iredlct potential roof failure areas will allow the engineer ard mire planner to develop a mine plan to avoid the roof failure areas and thus reduce overall mining costs. The ability to avoid roof failure areas also will permit maximum recovery of the coal resources. Auth.
83ll5o HYBRID COMPUTER S Y S T ~ FOR OPTIMIZATION OF EXTRACTION PROCEDURES IN TABULAR COAL DEPOSITS Hardy, M P; Christianson, M C US Bureau of Mines report OFR 66-82, Feb 1977, 70P The hybrid computer facility at the University of Minnesota was designed to analyze threedimensional pillar stresses in coal mines. This report describes recent improvements and appli-
cations that include expansion of the capability to model nonlinear seam behavior, installation of a color video output display monitor, ~ fm-hher development of software capabilities. To demonstrate the capability of the system, the influence of nonlinear seam behavior response on the Occurrence of coal mine bumps was fully investigated. Then the effect of improper mining sequence on b~np Occurrences was demonstrated. Also, the system was applied to the analysis of a series of practical coal mine problems. Mines in three coal seams were analyzed to invesT/gate the parameters that contribute to the Occurrence of coal mine b~nps. Avail: NTIS__Sprir~field, Va, 22161 USA (PB 82-204868 )
Surface subsidence and caving 831151 I=ROC~S~DINGS OF THE WORKSHOP ON SURFACE SUBSIDENCE DUE TO UNDERGROUND MINING, NOV 30-DEC 2 1981, LAKEVIEW INN AND COUNTRY CLUB, MORGANTOWN, WV
Peng, s s (~tor); Harth~A, M (editor) Morgantcwn, WV: West Virginia University, March 1982, 297P Gives the text of the 23 papers plus discussions in the areas of prediction, monitoring, characteristics, structural drainage, insurance ar~ abatement. The papers are given separate entries in this issue. 831152 ~ c ~ f OF MINING SUBSIDENCE ON A DISTRIBUTION SYST~ Anderton, S Gas Engng Marmge, V22, NS, May 1982, P175-181 Describes the method adopted for a gas main near Golborne Colliery to deal with the problem of mining subsidence. 831153 S E T I ~ S ABOVE TUNNELS IN THE UNITED KINGDOM THEIR MAGNITUDE AND FREDICT!ON 0'Reilly, M P; New, B M In: Tunne_!ling 82, Proceedings of the 3rd International Symposi~n, Brighton, 7-11 June 1982, P173-181. Publ London: INN, 1982 Measurements of settlement and groumd movement made on tunnelling projects located mainly in built-up areas are reviewed. The ground conditions studied ir~luded stiff-fissured clays, glacial deposits, recently deposited silty clays, cohesionless soils of low density, weak rocks and made ground. Mar~ of the tunnels were driven in free air by use of shields, but compressed air was used in the weaker soils to maintain stability: the bentonite shield and chemical treatment of the ground were also used in loose sands. The data frc~ these case studies are used to provide simple analytical tools that enable better l~ediction of the magnitude of settlements and ground movements caused by t~ing through salt ground to be made. 40 refs.
8311~ SUBSIDENCE M E A S ~ S
ASSOCIATED WITH SHIELD TUNNELLING IN SOFT GROUND Magata, H; Nakauchi, S; Sogabe, H In: Tunnelling 82, Proceedings of the 3rd International Symposium, Brighton, 7-11 June 1982, P231-2~0. Publ London" IMM, 1982
Based on past experience at Memtougou colliery and results from investigations the following conclusions were made: (i) most bumps occur at pillar areas where coal has been robbed frnm 2, 3 or 4 sides, (2) relevant factors affecting proneness to bumps are physical and mechamical properties of coal seams, geological comditions, the method of mining, entry layout ar~ firing methods. 8311~7 CONSIDESATIONS OF GAS OUTBURSTS IN USING DOME SALT MINES FOR STORAGE OF OIL AND NUCLEAR WASTE Mahtab, M A Proc ist Conference on Ground Control in Mining, Morgantown, 27-29 July 1981, ~ 0 58. Publ Morgantown: West Virginia University, 1981 Discusses gas outbursts in salt domes which are associated with an~nolous zones in the salt, depth of mining and method of excavation. It is ~roposed that gas bursts are initiated by diaking in biaxial compression and propagate by spalling of the cavity walls and further dlaking. The outburst is terminated by a combination of dilatancy hardenir6, increase in stress along the cavity axis, and enlargement of the cavity to the boundaries of the ~ e s s u r e pocket. Identification of an~nolous zones by in altu measurement of material l~operties is suggested in order to predict outburst prone zones, and shock blasting is l~roposed as a method of controlling gas bursts. 831148 o~TABILITY BEHAVIOUR OF COAL MINING TUNNELS WITH DLY~FERENT SUPPORTS Wells, B T; "~hittaker, B N Proc ist Conference on Groumd Control in Mining, Morgamtown, 27-29 July 1981, P6775. Publ Morgantown: West Virginia University, 1981 Discusses the stress fields encountered around mining tunnels. A critical review of the various analytical assessments (stress and strain analyses) of support requirements is presented. 831149 USE OF GEOLOGIC MOD,-LING IN THE PREDICTION OF ~DVERSE ROOF CONDITIONS Custer, E S; Gaddy, F L Proc Ist Conference on Ground Control in Mining, Morgantcwn, 27-29 July 1981, P167173. Publ Morgantc~n: West Virginia University, !981 Recent investigations of mine roof falls have demonstrated that roof failures are generally associated with geologic conlitions. The roof falls can be predicted by using techniques of depositional modelling for the coal bed and roof rocks, and by lineament analysis. The ability to iredlct potential roof failure areas will allow the engineer ard mire planner to develop a mine plan to avoid the roof failure areas and thus reduce overall mining costs. The ability to avoid roof failure areas also will permit maximum recovery of the coal resources. Auth.
83ll5o HYBRID COMPUTER S Y S T ~ FOR OPTIMIZATION OF EXTRACTION PROCEDURES IN TABULAR COAL DEPOSITS Hardy, M P; Christianson, M C US Bureau of Mines report OFR 66-82, Feb 1977, 70P The hybrid computer facility at the University of Minnesota was designed to analyze threedimensional pillar stresses in coal mines. This report describes recent improvements and appli-
cations that include expansion of the capability to model nonlinear seam behavior, installation of a color video output display monitor, ~ fm-hher development of software capabilities. To demonstrate the capability of the system, the influence of nonlinear seam behavior response on the Occurrence of coal mine bumps was fully investigated. Then the effect of improper mining sequence on b~np Occurrences was demonstrated. Also, the system was applied to the analysis of a series of practical coal mine problems. Mines in three coal seams were analyzed to invesT/gate the parameters that contribute to the Occurrence of coal mine b~nps. Avail: NTIS__Sprir~field, Va, 22161 USA (PB 82-204868 )
Surface subsidence and caving 831151 I=ROC~S~DINGS OF THE WORKSHOP ON SURFACE SUBSIDENCE DUE TO UNDERGROUND MINING, NOV 30-DEC 2 1981, LAKEVIEW INN AND COUNTRY CLUB, MORGANTOWN, WV
Peng, s s (~tor); Harth~A, M (editor) Morgantcwn, WV: West Virginia University, March 1982, 297P Gives the text of the 23 papers plus discussions in the areas of prediction, monitoring, characteristics, structural drainage, insurance ar~ abatement. The papers are given separate entries in this issue. 831152 ~ c ~ f OF MINING SUBSIDENCE ON A DISTRIBUTION SYST~ Anderton, S Gas Engng Marmge, V22, NS, May 1982, P175-181 Describes the method adopted for a gas main near Golborne Colliery to deal with the problem of mining subsidence. 831153 S E T I ~ S ABOVE TUNNELS IN THE UNITED KINGDOM THEIR MAGNITUDE AND FREDICT!ON 0'Reilly, M P; New, B M In: Tunne_!ling 82, Proceedings of the 3rd International Symposi~n, Brighton, 7-11 June 1982, P173-181. Publ London: INN, 1982 Measurements of settlement and groumd movement made on tunnelling projects located mainly in built-up areas are reviewed. The ground conditions studied ir~luded stiff-fissured clays, glacial deposits, recently deposited silty clays, cohesionless soils of low density, weak rocks and made ground. Mar~ of the tunnels were driven in free air by use of shields, but compressed air was used in the weaker soils to maintain stability: the bentonite shield and chemical treatment of the ground were also used in loose sands. The data frc~ these case studies are used to provide simple analytical tools that enable better l~ediction of the magnitude of settlements and ground movements caused by t~ing through salt ground to be made. 40 refs.
8311~ SUBSIDENCE M E A S ~ S
ASSOCIATED WITH SHIELD TUNNELLING IN SOFT GROUND Magata, H; Nakauchi, S; Sogabe, H In: Tunnelling 82, Proceedings of the 3rd International Symposium, Brighton, 7-11 June 1982, P231-2~0. Publ London" IMM, 1982