Welcome to CDC Stacks | Transfer Mechanics of Full-Column Resin-Grouted Roof Bolts; Bureau of Mines Report of Investigations -1990 RI 9336 - 10753 | National Institute for Occupational Safety and Health
Stacks Logo
Advanced Search
Select up to three search categories and corresponding keywords using the fields to the right. Refer to the Help section for more detailed instructions.
 
 
Help
Clear All Simple Search
Advanced Search
Transfer Mechanics of Full-Column Resin-Grouted Roof Bolts; Bureau of Mines Report of Investigations -1990 RI 9336
  • Published Date:
    1/1/1990
Filetype[PDF - 1.32 MB]


Details:
  • Description:
    The U.S. Bureau of Mines conducted a laboratory investigation designed to evaluate the stress and deformation characteristics of fully grouted roof bolts subjected to various magnitudes of end loadings. The experiment and subsequent analysis were completed, utilizing axial deformation data obtained -ultrasonically from forty-one 4-ft, grade 40 roof bolts, with a total of 132 measurement locations along the lengths of the bolts. The ultrasonic measurement instrumentation used in this investigation allowed for elongation measurements without requiring extensive bolt modifications. The results indicate that approximately 39 pct o{ the applied end load dissipated within the first 3.4 in of the bolts. However, only 3 pct of the applied load was realized beyond 28 in of the grout column. Data are presented individually for every 6-in increment of bolt length, and analysis was performed using statistical, nonlinear equations developed for 5,000 and 8,000 lb loading conditions.

  • Supporting Files:
    No Additional Files