- Email: [email protected]
Implementation of finite element model of heterogeneous anisotropic rock mass for the Tkibuli-Shaor coal deposit conditions
222A
894424 Soft rock pillars Abel, J F lnt J Min Geol Engng V6. N3, Oct 1988. P215-248 Pillar design takes into account the strength of the pillar and the load it carries. Three strength estimation methods, linear, exponential and confined core, are discussed using experimental data. All 3 methods use strength data for a small rock sample and fail to produce rational results for soft rock, even at moderate depth. The confined core method seems the most useful. Estimation of pillar load by the tributary area method gives conservative results. The parabolic load transfer approximation method shows more promise.
894425 Boulby shaft restoration Chilton, F; Maxwell. A S Min Engr V148. N329. Feb 1989, P371-376 Two 1100m deep shafts at the Boulby potash mine, Cleveland, run through a 10m thick marl layer overlying the main seam, which when damp acts as a viscous liquid and exerts high pressure on the shaft. A very thick lining in this region was ruled out on cost grounds, and a compressible foam injected behind the lining to absorb the high pressure. This lasted only two years before first signs of damage. Design and installation of a replacement lining of high strength concrete blocks under difficult conditions, with both shafts kept operational, are described.
894426 Rock mechanics program helps improve trona recovery at Stauffer's Big Island Mine in Wyoming Agapito, J FT; Hunter, R V Min Engng V41, NI, Jan 1989, P24-26 The trona deposits in southwest Wyoming are extracted by conventional room and pillar mining and also by using a continuous miner. Field instrumentation was set up to determine roof and pillar response to mining. In situ stress and convergence were monitored. Test mining layouts were used in the wings or side areas of panels. Creep rates were seen to stabilise after 2-3 months. Computer analysis was used to calculate stability. Based on these results, extraction ratio for conventional mining was raised, and higher productivity layouts adopted for the continuous miner.
894427 Innovative shaft lining method Torbin, R N; Kovar, R F Min Engng V41, N2, Feb 1989, P114-118 A new, highly specialised rapid shaft lining system is described, The continuous slipforming technique, lining the shaft from the bottom up. is employed, but polyurethane foam material is used in place of concrete. Rates as high as 30m/h can be achieved. The liner is thinner than the conventional concrete liner. The high cost on-site concrete batch plant is eliminated.
894428 Stability analysis of open-stope in steep-dip ore body (In Chinese) Yuan Yong Q Changsha lnst Alin ges VS, N4, Dec 1988, PI-IO The geometric relation between stope boundary and the direction of primary stress field in which the stope is located affects the distribution of secondary stress around the stope. Using data from sublevel open stoping of steep orebodies, a numerical model of elasto-plastic plane strain was studied using the
finite element method. Results show stability of the level pillar is critical for stability of the whole stope system, and that control of the size of the plastic zone within the pillar may reduce tensile failure, fully utilise the self-supporting capacity and reduce reserves of remaining pillars.
894429 Implementation of finite element model of heterogeneous anisotropic rock mass for the Tkibuli-Shaor coal deposit conditions Yufin, S A: Shvachko, I R; Morozov, A S; Berdzenishvili, T L; Gelashvili. G M; Gordeziani, Z A Proc 6th International Conference on Rock 34echanics, Montreal, 30 Aug-10 Sept 1987 V2, P1345-1348. Publ Rotterdam: A A Balkema. 1987 The seams lie in sandstone strata containing a layer of heaving clay. Due to folding, the seams dip at an angle of about 42 deg. Tectonic stress is in excess of gravitational stress and seismic activity can be observed at depth. The geological and geotechnical properties of the region are described. The finite element program STATAS has been used to model stress distribution around the mine, and information obtained used to minimise occurrence of rockburst.
894430 Hybrid numerical model for seam geometries Petersen, D L Key Questions in Rock Mechanics: Proc 29th US Symposium, Minneapolis, 13-15 June 1988 P537-542. Publ Rotterdam: A A Balkema. 1988 The formulation and intial testing of a model of an underground mine, which uses the displacement discontinuity model for the rock mass away from the seam and the finite difference method to model the seam and adjacent floor and roof rocks, is presented. Individual formulations, linking of the methods, and results of the application of the hybrid model are illustrated.
894431 Roof reinforcement systems in Iongwall mining. A management overview McCarthy, P J Proc 8th AMIRA Technical Meeting, Advances in Blasting and Ground Support,Sydney, 8th October 1987 P3.1-3.4. Publ Melbourne. AMIRA, 1987 Mathematical modelling of mining problems should be combined with field measurements and observations to simulate real conditions. A programme of roof support development in longwall mines in Australia, which allowed realistic input parameters to be used in the models, is described. Enhanced designs based on field measurement techniques proved more stable than previous designs. Measurements of in situ stress allow additional developments to be sited in areas of low stress profile.
894432 Use of underground mining and tunnelling techniques for in situ oil recovery Stephenson, H G; Luhning, R W Proc Tunnelling '88, London, 18-21 April 1988 P333-345. Publ London: IMM, 1988 The application of mining-developed tunnelling and shaft sinking techniques to access oil deposits suitable for the application of horizontal wells is examined. The methods are being applied at an experimental site in the Athabasca Oil Sands, Canada, where bitumen extraction following steam injection is to be attempted. Planning, shaft sinking, surface and underground layouts, and equipment are considered.
1989 Pergamon Press pie. Reproduction not permitted
894424 Soft rock pillars Abel, J F lnt J Min Geol Engng V6. N3, Oct 1988. P215-248 Pillar design takes into account the strength of the pillar and the load it carries. Three strength estimation methods, linear, exponential and confined core, are discussed using experimental data. All 3 methods use strength data for a small rock sample and fail to produce rational results for soft rock, even at moderate depth. The confined core method seems the most useful. Estimation of pillar load by the tributary area method gives conservative results. The parabolic load transfer approximation method shows more promise.
894425 Boulby shaft restoration Chilton, F; Maxwell. A S Min Engr V148. N329. Feb 1989, P371-376 Two 1100m deep shafts at the Boulby potash mine, Cleveland, run through a 10m thick marl layer overlying the main seam, which when damp acts as a viscous liquid and exerts high pressure on the shaft. A very thick lining in this region was ruled out on cost grounds, and a compressible foam injected behind the lining to absorb the high pressure. This lasted only two years before first signs of damage. Design and installation of a replacement lining of high strength concrete blocks under difficult conditions, with both shafts kept operational, are described.
894426 Rock mechanics program helps improve trona recovery at Stauffer's Big Island Mine in Wyoming Agapito, J FT; Hunter, R V Min Engng V41, NI, Jan 1989, P24-26 The trona deposits in southwest Wyoming are extracted by conventional room and pillar mining and also by using a continuous miner. Field instrumentation was set up to determine roof and pillar response to mining. In situ stress and convergence were monitored. Test mining layouts were used in the wings or side areas of panels. Creep rates were seen to stabilise after 2-3 months. Computer analysis was used to calculate stability. Based on these results, extraction ratio for conventional mining was raised, and higher productivity layouts adopted for the continuous miner.
894427 Innovative shaft lining method Torbin, R N; Kovar, R F Min Engng V41, N2, Feb 1989, P114-118 A new, highly specialised rapid shaft lining system is described, The continuous slipforming technique, lining the shaft from the bottom up. is employed, but polyurethane foam material is used in place of concrete. Rates as high as 30m/h can be achieved. The liner is thinner than the conventional concrete liner. The high cost on-site concrete batch plant is eliminated.
894428 Stability analysis of open-stope in steep-dip ore body (In Chinese) Yuan Yong Q Changsha lnst Alin ges VS, N4, Dec 1988, PI-IO The geometric relation between stope boundary and the direction of primary stress field in which the stope is located affects the distribution of secondary stress around the stope. Using data from sublevel open stoping of steep orebodies, a numerical model of elasto-plastic plane strain was studied using the
finite element method. Results show stability of the level pillar is critical for stability of the whole stope system, and that control of the size of the plastic zone within the pillar may reduce tensile failure, fully utilise the self-supporting capacity and reduce reserves of remaining pillars.
894429 Implementation of finite element model of heterogeneous anisotropic rock mass for the Tkibuli-Shaor coal deposit conditions Yufin, S A: Shvachko, I R; Morozov, A S; Berdzenishvili, T L; Gelashvili. G M; Gordeziani, Z A Proc 6th International Conference on Rock 34echanics, Montreal, 30 Aug-10 Sept 1987 V2, P1345-1348. Publ Rotterdam: A A Balkema. 1987 The seams lie in sandstone strata containing a layer of heaving clay. Due to folding, the seams dip at an angle of about 42 deg. Tectonic stress is in excess of gravitational stress and seismic activity can be observed at depth. The geological and geotechnical properties of the region are described. The finite element program STATAS has been used to model stress distribution around the mine, and information obtained used to minimise occurrence of rockburst.
894430 Hybrid numerical model for seam geometries Petersen, D L Key Questions in Rock Mechanics: Proc 29th US Symposium, Minneapolis, 13-15 June 1988 P537-542. Publ Rotterdam: A A Balkema. 1988 The formulation and intial testing of a model of an underground mine, which uses the displacement discontinuity model for the rock mass away from the seam and the finite difference method to model the seam and adjacent floor and roof rocks, is presented. Individual formulations, linking of the methods, and results of the application of the hybrid model are illustrated.
894431 Roof reinforcement systems in Iongwall mining. A management overview McCarthy, P J Proc 8th AMIRA Technical Meeting, Advances in Blasting and Ground Support,Sydney, 8th October 1987 P3.1-3.4. Publ Melbourne. AMIRA, 1987 Mathematical modelling of mining problems should be combined with field measurements and observations to simulate real conditions. A programme of roof support development in longwall mines in Australia, which allowed realistic input parameters to be used in the models, is described. Enhanced designs based on field measurement techniques proved more stable than previous designs. Measurements of in situ stress allow additional developments to be sited in areas of low stress profile.
894432 Use of underground mining and tunnelling techniques for in situ oil recovery Stephenson, H G; Luhning, R W Proc Tunnelling '88, London, 18-21 April 1988 P333-345. Publ London: IMM, 1988 The application of mining-developed tunnelling and shaft sinking techniques to access oil deposits suitable for the application of horizontal wells is examined. The methods are being applied at an experimental site in the Athabasca Oil Sands, Canada, where bitumen extraction following steam injection is to be attempted. Planning, shaft sinking, surface and underground layouts, and equipment are considered.
1989 Pergamon Press pie. Reproduction not permitted