Accession Number:

AD0757112

Title:

Ground Support Prediction Model

Descriptive Note:

Semi-annual rept. of Phase 2, 7 Jun-30 Nov 1972

Corporate Author:

JACOBS ASSOCIATES INC SAN FRANCISCO CA

Report Date:

1972-11-30

Pagination or Media Count:

36.0

Abstract:

The report describes the second phase of a two year research project to develop a tunnel support prediction model based on known geologic factors determined by pre-construction geologic investigation. Phase I was fully described in the final report for contract HO210038. Under phase I a detailed study was made of 33 case study tunnels, comparing geologic and construction factors with actual support systems used. From this a tentative empirical relationship was suggested. This concept called the Rock Structure Rating RSR places numerical ratings on geologic factors, the sum of which gives a relative index of the ability of the rock to support itself around a tunnel opening. The work described in this report covers the first six months of phase 2, where the work previously performed is being extended with additional empirical, theoretical and experimental capability to confirm, expand or modify the ground support prediction model. Five additional case studies are described and compared to the prediction model.

Subject Categories:

  • Geology, Geochemistry and Mineralogy
  • Structural Engineering and Building Technology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE