Accession Number:

AD0343274

Title:

Loading, Response, and Evaluation of Tunnels and Tunnel Liners in Granite

Descriptive Note:

[Technical Report, Technical Report]

Corporate Author:

HOLMES AND NARVER INC LOS ANGELES CA

Report Date:

1963-07-19

Pagination or Media Count:

446

Abstract:

The response of tunnels and tunnel liners in granite subjected to a 5.9-kiloton, contained, underground nuclear explosion was evaluated as a part of the Hard Hat Shot of Operation Nougat. The experiment included 43 test sections, of which 30 had liners and backpacking materials. The remaining 13 were either unlined or were lined without shock isolation material. There was no apparent influence of size, shape, or orientation parallel or perpendicular to shock wave on damage to unlined tunnels. There was a significant increase in damage in local zones of incompetent granite. Shock isolation materials were effective in reducing damage and shock spectra. There was little advantage of foam over cinders of comparable thickness. At the intermediate range, only the reinforced concrete liner with 24-inch foam survived undamaged. At the closest range, all test sections were destroyed with the exception of the reinforced concrete liner with 24-inch foam, which was very heavily damaged.

Subject Categories:

  • Civil Engineering
  • Explosions

Distribution Statement:

[A, Approved For Public Release]