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Test excavation for the Dietershan Tunnel of the Federal Railways high-speed track Hannover-Wurzberg (in German)
32A areas and the presence of a major fault adjacent to one extraction area were the major factors affecting results. The monitoring system has provided a warning system against ground control problems, and characterisation of ground behaviour for future development.
861254
Reinforcement of large pillars by bolting Mitchell, S J; Agapito, J F T; Weakly, L A
In: Rock Mechanics in Productivity and Protection (Proceedings of the Twenty-Fifth Symposium on Rock Mechanics, Evanston, Illinois, 25-27 June 1984) P523-532. Publ New York." AIME, 1984 Generalised stress distributions in large (18m cube) pillars at the Colony oil shale property, Colorado, USA, at various stages of pre- and post-failure, were established from many overcoring stress profiles. The effect of pillar bolting was extrapolated from observed unbolted behaviour, and was shown to increase strength by up to 10%. The effect of bolting on mine stability was examined by computer modelling. Bolting increases the bolted pillar safety factor by around 5% in the event of additional pillar failure. Progressive pillar failure is unlikely as most load will transfer to unmined abutments.
861255 Stress monitoring during Wongawilli extraction in 3 North Panel, Laleham No. 1 Colliery, South Blackwater, Queensland Wardle, L J; McNabb, K E CSIRO Division of Applied Geomechanics report N59, May 1985.36P Stress and convergence were monitored for Wongawilli (rib pillar) extraction over a 6 month period, using vibrating wire stressmeters and telescopic convergence rods installed in rib and roadway pillars and coal faces surrounding the panel. Major stress redistribution occurs when a pillar is isolated from the main extraction block by roadway drivage. As the roadway face advances, the load is transferred to the main extraction block. The isolated pillar undergoes constant rate stress relaxation, independent of subsequent mining activity, and is in a stress relieved state when extracted.
Avail: CSIRO Division of Applied Geomechanics, PO Box 54, Mt Waverley, Vic 3149, Australia
861257 USNC/TT study: geologic site investigations for tunnels Waggoner, E B: Daugherty, C W Underground Space V9. N2~3. 1985. PI09-11~ A statistical analysis is presented of a survc3 of 84 tunnels. Attempts are made to correlate the quantity and quality of site investigation prior to the project to construction parameters such as time to completion, construction costs, cost overruns, length, advance rate. laboratory testing and problems encountered. Among many recommendations are an increase in the percentage of estimated project cost spent on site investigation and an increase in average length of borehole per route foot.
861258 Los Angeles Metro Rail Project: overview and challenges Procter, R J; Hammond, D G Underground Space vg, N2~3. 1985. P120-125 The potential problems in constructing the 30km long metro are examined. The geology of the area is described and details of the exploration program along the route are given. The majority of the subway in soft ground is expected to be constructed by high speed tunnel boring machines. Five major problems and their anticipated solutions are listed. These are construction in tar sands, gassy ground, seismic exposure, seismic shaking and crossing active faults.
861259 Test excavation for the Dietershan Tunnel of the Federal Railways high-speed track Hannover-Wurzberg (In German) Morscher, J; Baudendistel, M; Schetelig, K
Proc 6th National Rock Mechanics Symposium, Aachen, 3-4 April 1985 P93-103. Publ Essen: German Society for Soil Mechanics and Foundation Engineering, 1985 The 7.3km Dietershan Tunnel, Germany, is in jointed, horizontally bedded sandstone with interbeds of siltstone and mudstone. Before driving, core borings, dilatometer tests and in situ stress measurements were made along its length and a 320m adit was excavated, to examine the behaviour of the rock mass in a large tunnel and determine suitable tunnelling and support methods. Monitoring of convergence and stresses enabled real behaviour to be compared with computed behaviour and the rock models applied in design could be verified. Excavation was by conventional drill and blast with reinforced shotcrete, bolts and steel ribs for support. Tunnelling machines could not be used because of rock strength, quartz content and dust problems.
Tunnels See also: 861146. 861147
861256 UTRC study: design of tunnel linings O'Rourke, T D Underground Space V9, N2/3, 1985, P102-108 The principal recommendations of the ASCE 'Guidelines for tunnel lining design" are summarised. The principal lining types and support systems are reviewed. The design process is considered in three stages: (1) defining operational criteria such as life, safety, costs, dimensional tolerance, appearance, leakage; (2) selecting and dimensioning the lining,considering the nature of underground loads and lining-ground reaction; and (3) coordinating design and tunnel construction. Practical examples are used to illustrate design principles.
861260
Las Pianas Tunnel: analysis and control of the influence of the second freeway tunnel Bailly, J C: Bouvard, A; Colombct, G Proc of the Eurotunnel '83 Conference, Basle, 22-24 June 1983 P5-11. Publ Marlow: Access Conferences Ltd, 1983 During excavation of a first tunnel by the New Austrian Method, serious problems were encountered. When a second tunnel was excavated at only 1.4 diameters from the first, a complete behavioural evaluation and monitoring study was set up. Details of the investigation are presented, including the geology of the Las Planas tunnel, conditions of the first tunnel before driving the second (including analysis of the deformation measurements), calculations on finished sections, the monitoring system for the second tunnel and readings taken during the excavation of the upper half section of the second tube and during the bench excavation.
861254
Reinforcement of large pillars by bolting Mitchell, S J; Agapito, J F T; Weakly, L A
In: Rock Mechanics in Productivity and Protection (Proceedings of the Twenty-Fifth Symposium on Rock Mechanics, Evanston, Illinois, 25-27 June 1984) P523-532. Publ New York." AIME, 1984 Generalised stress distributions in large (18m cube) pillars at the Colony oil shale property, Colorado, USA, at various stages of pre- and post-failure, were established from many overcoring stress profiles. The effect of pillar bolting was extrapolated from observed unbolted behaviour, and was shown to increase strength by up to 10%. The effect of bolting on mine stability was examined by computer modelling. Bolting increases the bolted pillar safety factor by around 5% in the event of additional pillar failure. Progressive pillar failure is unlikely as most load will transfer to unmined abutments.
861255 Stress monitoring during Wongawilli extraction in 3 North Panel, Laleham No. 1 Colliery, South Blackwater, Queensland Wardle, L J; McNabb, K E CSIRO Division of Applied Geomechanics report N59, May 1985.36P Stress and convergence were monitored for Wongawilli (rib pillar) extraction over a 6 month period, using vibrating wire stressmeters and telescopic convergence rods installed in rib and roadway pillars and coal faces surrounding the panel. Major stress redistribution occurs when a pillar is isolated from the main extraction block by roadway drivage. As the roadway face advances, the load is transferred to the main extraction block. The isolated pillar undergoes constant rate stress relaxation, independent of subsequent mining activity, and is in a stress relieved state when extracted.
Avail: CSIRO Division of Applied Geomechanics, PO Box 54, Mt Waverley, Vic 3149, Australia
861257 USNC/TT study: geologic site investigations for tunnels Waggoner, E B: Daugherty, C W Underground Space V9. N2~3. 1985. PI09-11~ A statistical analysis is presented of a survc3 of 84 tunnels. Attempts are made to correlate the quantity and quality of site investigation prior to the project to construction parameters such as time to completion, construction costs, cost overruns, length, advance rate. laboratory testing and problems encountered. Among many recommendations are an increase in the percentage of estimated project cost spent on site investigation and an increase in average length of borehole per route foot.
861258 Los Angeles Metro Rail Project: overview and challenges Procter, R J; Hammond, D G Underground Space vg, N2~3. 1985. P120-125 The potential problems in constructing the 30km long metro are examined. The geology of the area is described and details of the exploration program along the route are given. The majority of the subway in soft ground is expected to be constructed by high speed tunnel boring machines. Five major problems and their anticipated solutions are listed. These are construction in tar sands, gassy ground, seismic exposure, seismic shaking and crossing active faults.
861259 Test excavation for the Dietershan Tunnel of the Federal Railways high-speed track Hannover-Wurzberg (In German) Morscher, J; Baudendistel, M; Schetelig, K
Proc 6th National Rock Mechanics Symposium, Aachen, 3-4 April 1985 P93-103. Publ Essen: German Society for Soil Mechanics and Foundation Engineering, 1985 The 7.3km Dietershan Tunnel, Germany, is in jointed, horizontally bedded sandstone with interbeds of siltstone and mudstone. Before driving, core borings, dilatometer tests and in situ stress measurements were made along its length and a 320m adit was excavated, to examine the behaviour of the rock mass in a large tunnel and determine suitable tunnelling and support methods. Monitoring of convergence and stresses enabled real behaviour to be compared with computed behaviour and the rock models applied in design could be verified. Excavation was by conventional drill and blast with reinforced shotcrete, bolts and steel ribs for support. Tunnelling machines could not be used because of rock strength, quartz content and dust problems.
Tunnels See also: 861146. 861147
861256 UTRC study: design of tunnel linings O'Rourke, T D Underground Space V9, N2/3, 1985, P102-108 The principal recommendations of the ASCE 'Guidelines for tunnel lining design" are summarised. The principal lining types and support systems are reviewed. The design process is considered in three stages: (1) defining operational criteria such as life, safety, costs, dimensional tolerance, appearance, leakage; (2) selecting and dimensioning the lining,considering the nature of underground loads and lining-ground reaction; and (3) coordinating design and tunnel construction. Practical examples are used to illustrate design principles.
861260
Las Pianas Tunnel: analysis and control of the influence of the second freeway tunnel Bailly, J C: Bouvard, A; Colombct, G Proc of the Eurotunnel '83 Conference, Basle, 22-24 June 1983 P5-11. Publ Marlow: Access Conferences Ltd, 1983 During excavation of a first tunnel by the New Austrian Method, serious problems were encountered. When a second tunnel was excavated at only 1.4 diameters from the first, a complete behavioural evaluation and monitoring study was set up. Details of the investigation are presented, including the geology of the Las Planas tunnel, conditions of the first tunnel before driving the second (including analysis of the deformation measurements), calculations on finished sections, the monitoring system for the second tunnel and readings taken during the excavation of the upper half section of the second tube and during the bench excavation.