A LABORATORY APPARATUS FOR THE DETERMINATION OF THE ANCHORAGE CAPACITY OF ROCK BOLTS

THE INCREASING USE OF ROCK BOLTS AS A MEANS OF SUPPORT IN UNDERGROUND CONSTRUCTION REQUIRES ADDITIONAL KNOWLEDGE ON THE MOST EFFICIENT ROCK BOLT SYSTEMS IN DIFFERENT ROCK TYPES. A ROCK BOLT PULL TEST APPARATUS HAS BEEN DEVELOPED THAT ENABLE THE ANCHORAGE CAPACITIES OF EXPANSION SHELL ROCK BOLT ANCHOR SYSTEMS TO BE DETERMINED IN THE LABORATORY. IN THE APPARATUS, THE ROCK BOLTS ARE SET IN A HOLE IN A 6 INCH DIAMETER, 15 INCH LONG ROCK CORE THAT IS CAST INTO A STEEL CONFINING CYLINDER. THE REACTION FOR PULLING OF THE ROCK BOLT IS JACKED AGAINST THE ROCK CORE IN WHICH THE ANCHOR IS SET. MEASUREMENTS ARE MADE OF BOTH THE BOLT AND ANCHOR DISPLACEMENT. PRELIMINARY PULL TESTS HAVE BEEN CONDUCTED WITH FOUR DIFFERENT EXPANSION SHELL ANCHORS AND EIGHT DIFFERENT ROCK TYPES. IT IS RECOMMENDED THAT FUTURE INVESTIGATIONS INCLUDE DETERMINATION OF: (1) OPTIMUM TORQUE SETTINGS FOR DIFFERENT ANCHOR TYPES, (2) CREEP CHARACTERISTICS OF DIFFERENT ANCHOR TYPES, AND (3) CAPACITY OF GROUTED ANCHORS.

  • Supplemental Notes:
    • Mrd Lab No 68/396, 111 PP, 23 FIG, 2 TAB, 16 REF, 2 APP
  • Corporate Authors:

    Mrd Laboratory, Army Ce /US

    ,    
  • Authors:
    • Tiseo, B
  • Publication Date: 1969-11

Subject/Index Terms

Filing Info

  • Accession Number: 00235604
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 16 1970 12:00AM