GROUND SUPPORT PREDICTION MODEL (R.S.R. CONCEPT)

FOR SIX ON-GOING TUNNEL PROJECTS AND VERIFICATION OF ACTUAL SUPPORTS USED, MADE BY FIELD SITE VISITS WHERE POSSIBLE. ON GEOLOGIC INVESTIGATION, AND CONSTRUCTION FACTORS SUCH AS /AUTHORL EXCAVATION TO BE EMPLOYED. DEVELOPMENT OF THIS METHOD, KNOWN AS THE ROCK STRUCTURE RATING (RSR) CONCEPT, WAS BEGUN UNDER U.S. BUREAU OF MINES CONTRACT NO. H0210038 AND COMPLETED UNDER CONTRACT NO. H0220075. WORK PERFORMED UNDER THE PREVIOUS CONTRACT IS REVIEWED. BASED ON A CASE HISTORY STUDY APPROACH, IT UTILIZED DATA FROM 33 TUNNEL PROJECTS TO DEVELOP A TENTATIVE PREDICTION MODEL. THE ROCK STRUCTURE RATING IS A MEASURE OF THE ABILITY OF A ROCK MASS TO SUPPORT ITSELF AROUND A GIVEN TUNNEL OPENING BY ASSIGNING WEIGHTED RATINGS TO IMPORTANT GEOLOGIC AND CONSTRUCTION FACTORS AFFECTING THIS ABILITY. THIS COMBINED RATING (RSR) IS CORRELATED TO ACTUAL SUPPORT SYSTEMS, RESULTING IN AN EMPIRICAL RELATIONSHIP WHICH CAN BE USED TO PROJECT SUPPORT PREDICTIONS FOR FUTURE TUNNELS. DEVELOPMENT OF A MODIFIED AND EXPANDED PREDICTION MODEL IS DESCRIBED BASED ON ADDITIONAL RESEARCH. TWENTY CASE STUDIES WERE ADDED BRINGING THE TOTAL TO 53. SEVEN MINING OPERATIONS WERE INVESTIGATED TO CHECK THE APPLICABILITY OF THE PREDICTION METHOD TO MINING. TWENTY-FIVE PROMINENT MEN AND AGENCIES INVOLVED IN TUNNELING REVIEWED THE METHOD, COMPLETED QUESTIONNAIRES AND OFFERED COMMENTS AND SUGGESTIONS. THE RESULTING REVISED PREDICTION MODEL WAS USED TO PREDICT SUPPORT REQUIREMENTS

  • Supplemental Notes:
    • Contract H0220075 TECH REPT NO 125 5 APP
  • Corporate Authors:

    Jacobs Associates

    500 Sansome
    San Francisco, CA  United States  94111
  • Authors:
    • Wickham, G E
    • Tiedemannhr
  • Publication Date: 1974-1

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 155 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00210092
  • Record Type: Publication
  • Report/Paper Numbers: Final Rpt
  • Files: TRIS
  • Created Date: Jul 31 1974 12:00AM