Accession Number:

AD0509503

Title:

Optimum Positioning of Deep Underground Tunnels in Rock

Descriptive Note:

Technical rept.,

Corporate Author:

NAVAL CIVIL ENGINEERING LAB PORT HUENEME CA

Personal Author(s):

Report Date:

1970-04-01

Pagination or Media Count:

123.0

Abstract:

The objective of this study was to define the limit survival distances from ground zero for deep underground protective structures in rock and to formalize a methodology for defining the cost of such systems. To achieve this objective, a computer program was developed and subsequently was exercised for representative tunnels with concrete and steel liners in sandstone or granite. Limit distance contours were obtained for a range of effective seismic velocities. They show that there are optimum depths which, if exceeded, will increase the survival distance and decrease the survivability. The optimum site profile consists of a thick soil layer over a strong basement rock. Steel liners provide greater survivability and lower cost than concrete liners. Interestingly, the type of enveloping rock appears to be more significant to survival for smaller yield weapons than for larger ones. It is apparent from the results that deep underground protective structures can be designed for high degrees of survivability.

Subject Categories:

  • Seismology
  • Civil Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE