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Description of a very high speed transit (VHST) system operating in its own rarefied atmosphere in evacuated tubes in underground tunnels. Most cases considered took less time to go coast-to-coast (e.g., 21 min) than it takes an aircraft to climb to an efficient operating altitude.
- Robert M. Salter
- Paperback
- 1972
Describes a subway concept called "Planetran" comprising electromagnetically supported and propelled cars traveling in underground evacuated tubes, able to cross the United States in one hour. It is designed to interface with local transit systems, and the tunnel complex also contains utility transmission and auxiliary freight-carrying systems.
- Robert M. Salter
- Paperback
- 1978
5 sept. 2014 · Though tunnel warfare may seem exotic, it is hardly a new phenomenon. For millennia, tunnelers have used secret subterranean passageways to undermine fortifications, bypass defenses, elude legal authorities, and launch covert attacks. The elaborate tunnel networks of Gaza are just the latest example. Imagining ancient and medieval ...
Tunnelling and Underground Space Technology incorporating Trenchless Technology Research is an international journal which publishes authoritative articles encompassing original research and case studies on the development of tunnelling technology, the use of underground space, underground construction, and trenchless technology.
Printed with permission by Curran Associates, Inc. (2020) For permission requests, please contact Society for Mining, Metallurgy and Exploration at the address below. Society for Mining, Metallurgy and Exploration Inc. 12999 East Adam Aircraft Circle Englewood, CO 80112-4167. Phone: (303) 948-4200 Fax: (303) 973-3845.
1 juin 2024 · Tunnelling parameters that do not comply with the RSI mixed geological conditions can lead to improper operation and result in excessive surface settlement or even ground collapse (Liu et al., 2022b).
4 juin 2022 · The book provides an overview of tunneling technology and includes chapters that address analytical and numerical methods for rock load estimation and design support systems and advances in...
