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Boring in massive rocks — rock fracture problems
313A exists. Failure occurs when this is exceeded. Increased permeability in the collapsed zone reduces fluid pressure gradient and temporary stabilization results.
905476 Excavation methods - an approach to the design stage planning for long tunnels gicha,tds, J A; Viljocn, B C
Proc SANCOT S e w on Met&raised Underground Excavation, November 1989 t'63-85. Publ South Africa: Goldfields Press, 1989
Tunnels See also: 905289, 905313 905472 Projects of the straits of Messina and Gibraltar within the framework of the evolution concerning the great submarine links (In Italian) Pigorini, B
Gallerie N30, 1990, P19-29 Two major undersea projects are examined. The straits of Gibraltar crossing route chosen is 50kin long, with 27kin in water depths 100-300kin. Extensive geological survey along the land connections and subsea geophysical examination has been carried out. Seabed geology is basically a continuation of that seen onshore. If the project proceeds, it will use NATM in the predominantly flysch rock. The straits of Messina will be crossed by immersed tube. The on-land connections are mostly below the water table, in unconsolidated materials, and a Hydroshield slurry shield full face tunnelling machine is specified. 9O5473 Boston Harbor project shafts and tunnels Williamson, L A; Caspe, H P; Van Weele, B J Tunalg Technoi Newsl N67, Feb 1990, PI-IO New wastewater treatment facilities are to be constructed at Boston, including tunnels and shafts connecting treatment plants and an outfall tunnel, shaft, and diffuser system. The project is located within the Boston Basin, a down faulted and folded body of sedimentary and volcanic rocks. Cambridge Argillite is the principal formation for the output tunnel. Design specification, proposed construction methods, construction considerations, and contractual practices are described. 905474 TBM guidance. Manufacturers' report Pearse, G World Tunnlg 113, N2, April 1990, P143-151
Automatic control of machinery is of great value in the construction inc~ustry. Systems for guidance and steering of TBMs and roadheaders, alignment of drill holes for blasting, and laser systems for general directional control and monitoring are outlined, and their manufacturers listed. 9O5475 Underground geodesy Mayoud, M Proe International Symposium on Modern Mialng Technology, Taian, October 1988 P538-551. Publ Taian: Shandong Institute of Mining and Technology, 1988 The CERN accelerator tunnel must be constructed to very tight tolerances. A variety of techniques has been used to control the geometry of the project. A surface geodetic network has been developed which can be referenced via shafts using theodolites and gyro-theodolites. An improved gyro is used to guide the tunnelling machines. Photoprofiling and profile scanners are used to check the cross section. Instruments, methods, and data processing are described.
Projects involving the construction of long tunnels are too often characterised by large cost and time overruns compared with those in accepted tender. Although it is to a significant extent a reflection of the uncertainties with regard to such factors as ground conditions, it is in some cases the result of poor planning during the design stage. The excavation planning processes that can be implemented as part of the project design with the principal objective of minimising the risks both to the client and the contractor of project overruns are described. 9O5477 Boring in massive rocks - reck fracture problems Stacey, T R Proc SANCO T Seminar on Mechnnised Underground Excavation, November 1989 P87-90. Publ South Africa: Goldfields Press, 1989 The boring of shafts and tunnels is now a common and in many cases routine practice. In some cases however, fracturing of the rock interferes with the efficient operation of the borer. The fracturing, which appears to be common in massive rock types, may occur behind the face, but in many cases occurs at or ahead of the face. This results in problems like high cutter wear, poor gripper action, damage to the mucking system, etc. Results obtained through stress analyses are presented, and the potential for occurrence of rock fracture induced problems is examined. 905478 Boreability assessments for major tunnelling projects Blindheim, O T; Boniface, A Proc SANCOT Seminar on Meehnnised Underground Excavation, November 1989 P91-96. Publ South Africa: Goldfields Press, 1989 On major tunnelling projects with long drives, the estimation of likely TBM advance rates is of considerable importance in establishing the feasibility of the project. Different techniques that can be used to assess one of the major factors affecting advance rates, boreability, are described. Techiques discussed include the indirect methods developed by the Norwegian Institute of Technology, and direct methods. A case study based on a 19.4kin long aqueduct located in Natal, South Africa, is also presented. Some comments on recent developments in TBMs are presented. 9O5479 Excavation response studies at the Mol facility Neerdael, B; De Bruyn, D Proc NEA Workshop on Excavation Response in Geological Repositories for Radioactive Waste, Winnipeg, 26-28 April 1988 P465-479. Publ France: OECD, 1989 The Mol facility is an underground research laboratory in plastic clay, developed to assess the feasibility and longterm safety of a radioactive waste disposal system. A test drift was constructed with a comprehensive instrumentation system, to validate design, monitor clay response to excavation, and for Iongterm assessment of the drift's behaviour. Soil deformation, pore pressure, convergence of tunnel lining, pressure buildup and clay face deformation were monitored. Results have been interpreted and modelled by various codes, including CREEP/FLORA, NONSAP and EPLAST.
© 1990 Pergamon Press pie. Reproduction not permitted
905476 Excavation methods - an approach to the design stage planning for long tunnels gicha,tds, J A; Viljocn, B C
Proc SANCOT S e w on Met&raised Underground Excavation, November 1989 t'63-85. Publ South Africa: Goldfields Press, 1989
Tunnels See also: 905289, 905313 905472 Projects of the straits of Messina and Gibraltar within the framework of the evolution concerning the great submarine links (In Italian) Pigorini, B
Gallerie N30, 1990, P19-29 Two major undersea projects are examined. The straits of Gibraltar crossing route chosen is 50kin long, with 27kin in water depths 100-300kin. Extensive geological survey along the land connections and subsea geophysical examination has been carried out. Seabed geology is basically a continuation of that seen onshore. If the project proceeds, it will use NATM in the predominantly flysch rock. The straits of Messina will be crossed by immersed tube. The on-land connections are mostly below the water table, in unconsolidated materials, and a Hydroshield slurry shield full face tunnelling machine is specified. 9O5473 Boston Harbor project shafts and tunnels Williamson, L A; Caspe, H P; Van Weele, B J Tunalg Technoi Newsl N67, Feb 1990, PI-IO New wastewater treatment facilities are to be constructed at Boston, including tunnels and shafts connecting treatment plants and an outfall tunnel, shaft, and diffuser system. The project is located within the Boston Basin, a down faulted and folded body of sedimentary and volcanic rocks. Cambridge Argillite is the principal formation for the output tunnel. Design specification, proposed construction methods, construction considerations, and contractual practices are described. 905474 TBM guidance. Manufacturers' report Pearse, G World Tunnlg 113, N2, April 1990, P143-151
Automatic control of machinery is of great value in the construction inc~ustry. Systems for guidance and steering of TBMs and roadheaders, alignment of drill holes for blasting, and laser systems for general directional control and monitoring are outlined, and their manufacturers listed. 9O5475 Underground geodesy Mayoud, M Proe International Symposium on Modern Mialng Technology, Taian, October 1988 P538-551. Publ Taian: Shandong Institute of Mining and Technology, 1988 The CERN accelerator tunnel must be constructed to very tight tolerances. A variety of techniques has been used to control the geometry of the project. A surface geodetic network has been developed which can be referenced via shafts using theodolites and gyro-theodolites. An improved gyro is used to guide the tunnelling machines. Photoprofiling and profile scanners are used to check the cross section. Instruments, methods, and data processing are described.
Projects involving the construction of long tunnels are too often characterised by large cost and time overruns compared with those in accepted tender. Although it is to a significant extent a reflection of the uncertainties with regard to such factors as ground conditions, it is in some cases the result of poor planning during the design stage. The excavation planning processes that can be implemented as part of the project design with the principal objective of minimising the risks both to the client and the contractor of project overruns are described. 9O5477 Boring in massive rocks - reck fracture problems Stacey, T R Proc SANCO T Seminar on Mechnnised Underground Excavation, November 1989 P87-90. Publ South Africa: Goldfields Press, 1989 The boring of shafts and tunnels is now a common and in many cases routine practice. In some cases however, fracturing of the rock interferes with the efficient operation of the borer. The fracturing, which appears to be common in massive rock types, may occur behind the face, but in many cases occurs at or ahead of the face. This results in problems like high cutter wear, poor gripper action, damage to the mucking system, etc. Results obtained through stress analyses are presented, and the potential for occurrence of rock fracture induced problems is examined. 905478 Boreability assessments for major tunnelling projects Blindheim, O T; Boniface, A Proc SANCOT Seminar on Meehnnised Underground Excavation, November 1989 P91-96. Publ South Africa: Goldfields Press, 1989 On major tunnelling projects with long drives, the estimation of likely TBM advance rates is of considerable importance in establishing the feasibility of the project. Different techniques that can be used to assess one of the major factors affecting advance rates, boreability, are described. Techiques discussed include the indirect methods developed by the Norwegian Institute of Technology, and direct methods. A case study based on a 19.4kin long aqueduct located in Natal, South Africa, is also presented. Some comments on recent developments in TBMs are presented. 9O5479 Excavation response studies at the Mol facility Neerdael, B; De Bruyn, D Proc NEA Workshop on Excavation Response in Geological Repositories for Radioactive Waste, Winnipeg, 26-28 April 1988 P465-479. Publ France: OECD, 1989 The Mol facility is an underground research laboratory in plastic clay, developed to assess the feasibility and longterm safety of a radioactive waste disposal system. A test drift was constructed with a comprehensive instrumentation system, to validate design, monitor clay response to excavation, and for Iongterm assessment of the drift's behaviour. Soil deformation, pore pressure, convergence of tunnel lining, pressure buildup and clay face deformation were monitored. Results have been interpreted and modelled by various codes, including CREEP/FLORA, NONSAP and EPLAST.
© 1990 Pergamon Press pie. Reproduction not permitted