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Report on Hard-Rock Tunnelling Investigation
The report surveys the technology of hard-rock tunneling, with particular emphasis on tunneling machines, and is part of the overall study necessary to establish the relative feasibility of tunnel, surface, and elevated routes for a High Speed Ground Transport (HSGT) system. Drilling-and-blasting is the conventional method of hard-rock tunnel excavation. Despite many technological improvements in recent years the cost of conventional tunneling appears to be rising. Tunneling machines have been used successfully on about 20 projects in the last 10 years or so. Most of the successful machines have worked in the softer rocks, usually under quite favorable geologic conditions. On some projects machine tunneling has been faster and cheaper than drilling-and-blasting, but the number of machine-bored tunnels is too small to make quantitative comparisons of the two methods at the present time. It is recommended that a program be initiated for the development of improved tunneling machines, capable of boring harder rocks and coping with more adverse geologic conditions than present-day machines. In addition, a program is recommended for encouraging greater use of tunneling machines by agencies currently engaged in tunnel construction. Several other methods of hard-rock excavation are mentioned briefly, including nuclear, thermal, and hydraulic methods. These methods have not been studied in detail.
Report on Hard-Rock Tunnelling Investigation
The report surveys the technology of hard-rock tunneling, with particular emphasis on tunneling machines, and is part of the overall study necessary to establish the relative feasibility of tunnel, surface, and elevated routes for a High Speed Ground Transport (HSGT) system. Drilling-and-blasting is the conventional method of hard-rock tunnel excavation. Despite many technological improvements in recent years the cost of conventional tunneling appears to be rising. Tunneling machines have been used successfully on about 20 projects in the last 10 years or so. Most of the successful machines have worked in the softer rocks, usually under quite favorable geologic conditions. On some projects machine tunneling has been faster and cheaper than drilling-and-blasting, but the number of machine-bored tunnels is too small to make quantitative comparisons of the two methods at the present time. It is recommended that a program be initiated for the development of improved tunneling machines, capable of boring harder rocks and coping with more adverse geologic conditions than present-day machines. In addition, a program is recommended for encouraging greater use of tunneling machines by agencies currently engaged in tunnel construction. Several other methods of hard-rock excavation are mentioned briefly, including nuclear, thermal, and hydraulic methods. These methods have not been studied in detail.
Report on Hard-Rock Tunnelling Investigation
R. C. Hirschfield (author)
1965
63 pages
Report
No indication
English
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