Tunnelling 50 Years Ago

This article reports on a 50-year retrospective of tunneling practices and the shifting relationships between contractors and client agencies and the independent engineer. Contracts were much simpler in the 50s and 60s, with little provision for sharing risks. Because there were more contractors then, there was little concern about unfair monopoly practices. The area where there have been the biggest advances is safety. Another area of significant change is the shift from relying solely on cast iron to line tunnels. Highly engineered brick linings for tunnels that carried substances like water are also no longer in use. Other areas of change include hand tunneling, tunneling machines, surveying techniques and tunneling in rock. Details are given about key historical tunneling jobs.


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Filing Info

  • Accession Number: 01044928
  • Record Type: Publication
  • Source Agency: UC Berkeley Transportation Library
  • Files: BTRIS, TRIS
  • Created Date: Mar 22 2007 1:49PM