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Computer aided design and strata control
133A most measured observations.
844O94 Analysis of the time-dependent hehaviour of underground
works (In French) Ngnyen Minh, D; Berest, P; Ikrgues, J
Proc 5th Congress of the lnterMtimml Society for Rock Mechanics, Melbourne, 10-15 April 1983 V2, PD233-D239. Publ Rotterdam." A. A. Balkema, 1983 Two aspects of the time-dependent behaviour of structures in either resistant-brittle or soft-plastic rocks are illustrated. For hard rocks it is shown that strain softening can account for observed retarded deformations in existing structures. It is also shown that in the case of rigid lining of cavities inside soft rocks the viscoplastic zone disappears.
844095 Improved stability through optimized rock blasting Holmberg, R; Larsson, B; Sjoberg, C
Swedish Detanic Research Foundation report DS 1984:2, 23 Feb 1984, 17P At Stenungsund, Sweden, an underground naptha storage facility was constructed consisting of two caverns totalling a capacity of 510,000 cu m with transport tunnels. Cautious blasting was used to avoid blast damage to the surrounding gneiss and the roof was reinforced with steel bolts followed by a 2.5cm lining of sprayed concrete.
Avail: Swedish Detonic Research Foundation, Box 32058, S126 11 Stockholm, Sweden
Mines See also: 844029, 844049, 844077, 844079, 844080, 844173, 844174, 844175, 844180, 844182, 844183, 844184, 844186, 844188, 844190, 844192, 844193, 844194, 844195, 844196, 844197, 844201, 844205, 844206, 844208, 844210, 844211, 844212, 844214, 844217, 844218, 844316, 844343, 844348, 844359 844096 Strata mechanics. Proceedings of the Symposium on Strata Mechanics, Newcastle-upou-Tyne, 5-7 April 1982 (Developments in Gcoteclmical Engineering V32) Farmer, I W (editor)
Amsterdam: Elsevier, 1982, 289P Papers presented cover the following topics: strata deformation around longwall workings, longwall face support, shafts and insets, access roadways and tunnels, room and pillar and shortwall workings.
844O97 Computer aided design and strata control Arcamone, J; Dejean, M; Geraud, C
lnt J Min Engng V2, NI, March 1984, P43.49 A computer aided design system for steep face seams has been developed on a minicomputer, based upon a set of rules related to strata control for the siting of new mine workings. The rules are a function of the 'volume of influence' exerted by existing workings.
844O98 LougwaH mining of coal from seams liable to rock bursts experiences in Ostrava-Karvina Coal Basin, Czechoslovakia Siska, L
J Min Met Fuels V31, Ng, Sept 1983, P363-367
R.M.M.S. 21/4--F
The complex geological conditions in the Ostrava-Karvina Coalfield, Czechoslovakia, are outlined. Due to different mining conditions a wide range of methods, machines and equipment is used in the longwall faces. Between 25-30~oof output is from outburst-prone seams and the frequency of rock bursts has been analysed. The predisposing factors, predictive and preventive measures are discussed.
844099 Lougwail ground control - US experiences Peng, S S; Chiang, H S
J Min Met Fuels V31, N9, Sept 1983, P397-406,414-415 The distribution oflongwall panels in US mines is shown in relation to seam height. The problems of roof stability and the interaction between the roof and different types of support are analysed and the load densities used in US Iongwalls are given in terms of seam height.
844100 Rock mechanics analysis of the Springhill Mine disaster (October 23, 1958) Notley, K R
Min Sci Teelmol V1, N2, Jan 1984, P149-163 The evolution of mining practices in the collieries at Springhill, Nova Scotia, Canada, is recounted over a 40-year period during which 525 bumps or rock bursts were recorded in the No 2 Mine. At a depth of4000ft a devastating bump occurred which destroyed the whole of the producing area of the mine. Early rock mechanics studies during the five-year period prior to the disaster are described, and a re-assessment is made of some of the data. The displacement discontinuity method of stress analysis for tabular ore-bodies is used to study patterns of stress build-up during the mining of the last three longwalls. Factors contributing to bumping are discussed and a theory of bump mechanism is developed in the light of descriptions of earlier bumps at Springhill and literature from other bump and rock burst prone areas of the world. Bumping in coal mines appears to be inevitable under certain conditions of depth and geology.
844101 Distribution of faults in the Rybruk coalfield (In Polish) Kempa, S
Przegl Gara V39, NIl-12, Nov-Dec 1983, P443-449 The occurrence of faults in the mines of the Rybruk Coalfield, Poland, is characterized quantitatively, fault orientations are analysed and the preferred orientation of mining is determined. Three groups of mines with similar distribution of faults and with resulting similar difficulties are described.
844102 Drilling of preventive boreholes against outburst hazard (in Russian) Fominykh, E I
Shakhtnoc Strait N7, July 1983, P26-27 To work an outburst-prone seam at depths of 230-490m where the strength of the coal and its gas characteristics vary over the seam section, the drilling of preventive boreholes has proved to be the only effective counter-measure. Holes of 130ram diameter, 20-44m long, at angles between 0 and 8 deg are drilled, from adjacent workings where possible.
844O94 Analysis of the time-dependent hehaviour of underground
works (In French) Ngnyen Minh, D; Berest, P; Ikrgues, J
Proc 5th Congress of the lnterMtimml Society for Rock Mechanics, Melbourne, 10-15 April 1983 V2, PD233-D239. Publ Rotterdam." A. A. Balkema, 1983 Two aspects of the time-dependent behaviour of structures in either resistant-brittle or soft-plastic rocks are illustrated. For hard rocks it is shown that strain softening can account for observed retarded deformations in existing structures. It is also shown that in the case of rigid lining of cavities inside soft rocks the viscoplastic zone disappears.
844095 Improved stability through optimized rock blasting Holmberg, R; Larsson, B; Sjoberg, C
Swedish Detanic Research Foundation report DS 1984:2, 23 Feb 1984, 17P At Stenungsund, Sweden, an underground naptha storage facility was constructed consisting of two caverns totalling a capacity of 510,000 cu m with transport tunnels. Cautious blasting was used to avoid blast damage to the surrounding gneiss and the roof was reinforced with steel bolts followed by a 2.5cm lining of sprayed concrete.
Avail: Swedish Detonic Research Foundation, Box 32058, S126 11 Stockholm, Sweden
Mines See also: 844029, 844049, 844077, 844079, 844080, 844173, 844174, 844175, 844180, 844182, 844183, 844184, 844186, 844188, 844190, 844192, 844193, 844194, 844195, 844196, 844197, 844201, 844205, 844206, 844208, 844210, 844211, 844212, 844214, 844217, 844218, 844316, 844343, 844348, 844359 844096 Strata mechanics. Proceedings of the Symposium on Strata Mechanics, Newcastle-upou-Tyne, 5-7 April 1982 (Developments in Gcoteclmical Engineering V32) Farmer, I W (editor)
Amsterdam: Elsevier, 1982, 289P Papers presented cover the following topics: strata deformation around longwall workings, longwall face support, shafts and insets, access roadways and tunnels, room and pillar and shortwall workings.
844O97 Computer aided design and strata control Arcamone, J; Dejean, M; Geraud, C
lnt J Min Engng V2, NI, March 1984, P43.49 A computer aided design system for steep face seams has been developed on a minicomputer, based upon a set of rules related to strata control for the siting of new mine workings. The rules are a function of the 'volume of influence' exerted by existing workings.
844O98 LougwaH mining of coal from seams liable to rock bursts experiences in Ostrava-Karvina Coal Basin, Czechoslovakia Siska, L
J Min Met Fuels V31, Ng, Sept 1983, P363-367
R.M.M.S. 21/4--F
The complex geological conditions in the Ostrava-Karvina Coalfield, Czechoslovakia, are outlined. Due to different mining conditions a wide range of methods, machines and equipment is used in the longwall faces. Between 25-30~oof output is from outburst-prone seams and the frequency of rock bursts has been analysed. The predisposing factors, predictive and preventive measures are discussed.
844099 Lougwail ground control - US experiences Peng, S S; Chiang, H S
J Min Met Fuels V31, N9, Sept 1983, P397-406,414-415 The distribution oflongwall panels in US mines is shown in relation to seam height. The problems of roof stability and the interaction between the roof and different types of support are analysed and the load densities used in US Iongwalls are given in terms of seam height.
844100 Rock mechanics analysis of the Springhill Mine disaster (October 23, 1958) Notley, K R
Min Sci Teelmol V1, N2, Jan 1984, P149-163 The evolution of mining practices in the collieries at Springhill, Nova Scotia, Canada, is recounted over a 40-year period during which 525 bumps or rock bursts were recorded in the No 2 Mine. At a depth of4000ft a devastating bump occurred which destroyed the whole of the producing area of the mine. Early rock mechanics studies during the five-year period prior to the disaster are described, and a re-assessment is made of some of the data. The displacement discontinuity method of stress analysis for tabular ore-bodies is used to study patterns of stress build-up during the mining of the last three longwalls. Factors contributing to bumping are discussed and a theory of bump mechanism is developed in the light of descriptions of earlier bumps at Springhill and literature from other bump and rock burst prone areas of the world. Bumping in coal mines appears to be inevitable under certain conditions of depth and geology.
844101 Distribution of faults in the Rybruk coalfield (In Polish) Kempa, S
Przegl Gara V39, NIl-12, Nov-Dec 1983, P443-449 The occurrence of faults in the mines of the Rybruk Coalfield, Poland, is characterized quantitatively, fault orientations are analysed and the preferred orientation of mining is determined. Three groups of mines with similar distribution of faults and with resulting similar difficulties are described.
844102 Drilling of preventive boreholes against outburst hazard (in Russian) Fominykh, E I
Shakhtnoc Strait N7, July 1983, P26-27 To work an outburst-prone seam at depths of 230-490m where the strength of the coal and its gas characteristics vary over the seam section, the drilling of preventive boreholes has proved to be the only effective counter-measure. Holes of 130ram diameter, 20-44m long, at angles between 0 and 8 deg are drilled, from adjacent workings where possible.