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886247 Double shield tunnel boring machines. Development and current experiences (In Italian)
292A
Machine excavation 886247 Double shield tunnel boring machines. Development and current experiences (In Italian) Grandori, C Gallerie VIO, N26. 1988, P39-41 The double telescopic shield feature on full face machines allows hard rock machines to advance in a wide variety of geological conditions with the installation of appropriate ground support systems. Design of the machine, particdlarly the telescoping section connecting the main shields,machine control and steering systems, and cutter head design are described.
886248 Golden Horn clean-up contributes valuable data Bilgin, N; Seyrek, T; Shahriar, K Tunn Tutu& V20, N6, June 1988. P41-44 Geotechnical factors affecting roadheader performance in tunnelling are examined. Shift data, overall machine performance and rock geotechnical properties are presented, and a statistital analysis carried out to determine a correlation between machine cutting performance and rock mass properties. Rock mass cuttability index, a product of rock compressive strength and RQD, is shown to be the main factor governing roadheader advance rate. Values from the derived equation correlate well with data from a coalmine.
886249 Practical results from reduced-scale testing of pick cutting heads for tunnelling applications Deliac, E P; Cordelier, P R Proc Tunnelling ‘88, London, 18-21 April 1988 P79-86. Pub1 London: MM, 1988 Reduced scale (l/6 and l/4) tests were carried out in France, initially with a drum type continuous miner, then with roadheader type cutters in penetrative and shearing modes. The rig was used to design heads and picks for shaft development and for potential use in a uranium mine. Results of this work are presented and the main criteria for optimum head design or selection discussed. Reduced scale testing of cutting heads has proved a reliable, rapid, and economical means of investigating rock cuttability for tunnelling purposes.
886250 Mechanical shaft sinkmg Sands, P F Proc 13th World Mining Congress, Improvement of Mine Proictivity and Overall Economy by Modrrn Technobgy, Stockholm, June 1987 V2, P705-713. Pub1 Rotterdam: A A Balkema. 1987 Field and laboratory testing towards the development of a blind shaft boring machine are described. Improvements in penetration rate and percent availability are possible by using larger diameter disc cutters plus waterjets, improving cutter design and cutterhead profile, adoption of vacuum removal of cuttings from the face, and control over machine steering. Integrated together, these developments will improve performance and economy. 0
886251 New achievements in shaft sinking in the Lubin-Glogow Copperfield Pawlak, M; Nowakowski, P Proc 13th World Mining Congress, Improvement of Mine ProLctivity and Overall Economy by Modern Technology, Stockholm, June 1987 V2, P715-719. Pub1 Rouerdam: A A Balkema. 1987 Shafts to reach the orebody pass through 400-5OOm of saturated quaternary layers, and ground freezing is the most suitable rock improvement technique. The organisational and excavation problems are discussed. Particular attention is paid to the mining of the frozen rock and the development of a worm rotary header with tangential and radial cutters to replace manual or drill and blast methods.
Rock and Soil Reinforcement and Support 886252 Mechanized scaIlng and roof support systems Jonsson, G; Kareby, B L; Lundgren, K; Sylwan, B A Proc 13th World Mining Congress, Improvement of Mine Prodrrctivity and Overall Economy by Modern Technobgy, Stockholm, June 1987 V2, P777-782. Pub1 Rotterdam: A A Balkema, 1987 Scaling and support installation were for many centuries the most dangerous activities in underground mining. Adoption of smooth blasting techniques with smaller damaged zones and the use of mechanised scaling have reduced danger levels. The development of modern rock bolts, mechanical or friction anchored, grouted, or cable, and bolting machines, improved application of shotcrete and increased understanding of the rock mechanical principles of support have also played major roles in increasing safety.
Bolts and anchors 886253 Innovative truss supports help handle ground control problems Seegmiller, B L CoaI V25, N4, April 1988, P77-79 Truss support systems developed for ground control are described. The entry truss system has double tie rods to withstand higher support loads on longwall gateroads. The intersection truss has horizontal, angle and vertical members in tension simultaneously and creates a 3D support force field. The continuous entry truss is a combination of entry and intersection. The cutter roof truss was developed to counteract stability associated with solid-block sides of longwall tailgates. 886254 Analysis of rock reinforcement using finite difference methods Brady, B; Lorig, L Comput Geotech V5, N2, 1988, P123-149 Two models of reinforcement are presented, one based on local action of a reinforcing element at a slipping joint, the other on spatially extensive action in a rock subject to diffuse deformation. The principles of some finite difference methods for stress and displacement analysis are outlined. The performance of the spatially extensive model, based on long steel cables grouted into boreholes, is examined using the code
1988 Pergamon Press plc. Reproduction
not permitted
Machine excavation 886247 Double shield tunnel boring machines. Development and current experiences (In Italian) Grandori, C Gallerie VIO, N26. 1988, P39-41 The double telescopic shield feature on full face machines allows hard rock machines to advance in a wide variety of geological conditions with the installation of appropriate ground support systems. Design of the machine, particdlarly the telescoping section connecting the main shields,machine control and steering systems, and cutter head design are described.
886248 Golden Horn clean-up contributes valuable data Bilgin, N; Seyrek, T; Shahriar, K Tunn Tutu& V20, N6, June 1988. P41-44 Geotechnical factors affecting roadheader performance in tunnelling are examined. Shift data, overall machine performance and rock geotechnical properties are presented, and a statistital analysis carried out to determine a correlation between machine cutting performance and rock mass properties. Rock mass cuttability index, a product of rock compressive strength and RQD, is shown to be the main factor governing roadheader advance rate. Values from the derived equation correlate well with data from a coalmine.
886249 Practical results from reduced-scale testing of pick cutting heads for tunnelling applications Deliac, E P; Cordelier, P R Proc Tunnelling ‘88, London, 18-21 April 1988 P79-86. Pub1 London: MM, 1988 Reduced scale (l/6 and l/4) tests were carried out in France, initially with a drum type continuous miner, then with roadheader type cutters in penetrative and shearing modes. The rig was used to design heads and picks for shaft development and for potential use in a uranium mine. Results of this work are presented and the main criteria for optimum head design or selection discussed. Reduced scale testing of cutting heads has proved a reliable, rapid, and economical means of investigating rock cuttability for tunnelling purposes.
886250 Mechanical shaft sinkmg Sands, P F Proc 13th World Mining Congress, Improvement of Mine Proictivity and Overall Economy by Modrrn Technobgy, Stockholm, June 1987 V2, P705-713. Pub1 Rotterdam: A A Balkema. 1987 Field and laboratory testing towards the development of a blind shaft boring machine are described. Improvements in penetration rate and percent availability are possible by using larger diameter disc cutters plus waterjets, improving cutter design and cutterhead profile, adoption of vacuum removal of cuttings from the face, and control over machine steering. Integrated together, these developments will improve performance and economy. 0
886251 New achievements in shaft sinking in the Lubin-Glogow Copperfield Pawlak, M; Nowakowski, P Proc 13th World Mining Congress, Improvement of Mine ProLctivity and Overall Economy by Modern Technology, Stockholm, June 1987 V2, P715-719. Pub1 Rouerdam: A A Balkema. 1987 Shafts to reach the orebody pass through 400-5OOm of saturated quaternary layers, and ground freezing is the most suitable rock improvement technique. The organisational and excavation problems are discussed. Particular attention is paid to the mining of the frozen rock and the development of a worm rotary header with tangential and radial cutters to replace manual or drill and blast methods.
Rock and Soil Reinforcement and Support 886252 Mechanized scaIlng and roof support systems Jonsson, G; Kareby, B L; Lundgren, K; Sylwan, B A Proc 13th World Mining Congress, Improvement of Mine Prodrrctivity and Overall Economy by Modern Technobgy, Stockholm, June 1987 V2, P777-782. Pub1 Rotterdam: A A Balkema, 1987 Scaling and support installation were for many centuries the most dangerous activities in underground mining. Adoption of smooth blasting techniques with smaller damaged zones and the use of mechanised scaling have reduced danger levels. The development of modern rock bolts, mechanical or friction anchored, grouted, or cable, and bolting machines, improved application of shotcrete and increased understanding of the rock mechanical principles of support have also played major roles in increasing safety.
Bolts and anchors 886253 Innovative truss supports help handle ground control problems Seegmiller, B L CoaI V25, N4, April 1988, P77-79 Truss support systems developed for ground control are described. The entry truss system has double tie rods to withstand higher support loads on longwall gateroads. The intersection truss has horizontal, angle and vertical members in tension simultaneously and creates a 3D support force field. The continuous entry truss is a combination of entry and intersection. The cutter roof truss was developed to counteract stability associated with solid-block sides of longwall tailgates. 886254 Analysis of rock reinforcement using finite difference methods Brady, B; Lorig, L Comput Geotech V5, N2, 1988, P123-149 Two models of reinforcement are presented, one based on local action of a reinforcing element at a slipping joint, the other on spatially extensive action in a rock subject to diffuse deformation. The principles of some finite difference methods for stress and displacement analysis are outlined. The performance of the spatially extensive model, based on long steel cables grouted into boreholes, is examined using the code
1988 Pergamon Press plc. Reproduction
not permitted