Three recent projects in the United States have shown that eliminating the conventional steel and concrete structural lining of a tunnel by making the rock work as an arch, is both practical and cost effective. Costs are saved by elminating the redundancy between the initial tunnel suupport and the final structural lining for permanent stabilization. It also promotes construction safety. The design method provides for a rational structural analysis of the reinforced rock arch and its specific reinforcement requirements. The arch acts like a segmented masonry vousoir arch. It has no bending capacity or tensile strength but transmits the loading by compression from the tunnel crown to the abutments. Cost savings are estimated at 10-20%, depending on geologic conditions. Details of design and construction considerations are discussed. The projects noted here are the Reverse Curve Tunnel in Colorado, Keystone Tunnel in South Dalota, and the Hanging Lake Tunnel in Glenwood Canyon.

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Filing Info

  • Accession Number: 00618498
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jan 31 1992 12:00AM