U.S. flag An official website of the United States government.
Official websites use .gov

A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS

A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

i

Report of Investigations 9121: Column Length Criteria for Resin Bolting in Evaporites

Public Domain
File Language:
English


Details

  • Journal Article:
    MISSING
  • Personal Author:
  • Description:
    This Bureau of Mines report discusses how pull-test data can help establish polyester resin column length criteria for roof bolts in evaporite minerals. The study evaluates the effectiveness of partial to full columns of resin in anchoring 4-ft, No. 6, Grade 40 rebar roof bolts in potash, salt, trona, gypsum, and borate mine roofs. Pull tests were performed on over 600 roof bolts in 11 evaporite mines. Column lengths ranging from 6 to 48 in (fully grouted) were evaluated for each test site. In general, comparative results among all test sites indicate that pull-out loads in excess of 10 tons (force) were attained with resin-grouted bolts having 13 to 75 pct less than a full column of polyester resin. Ten tons (force) of load-carrying capability compared favorably, in terms of strength, with the calculated yield strength of the rebar used in the tests, which was 8.8 Tons (force). The site-specific nature of each test site, due to the unique combinations of geology, mine- induced stresses, and other unknown parameters, prevented the establishment of valid generic column-length criteria. For these reasons, data to evaluate resin-column-length effectiveness are best obtained on a mine-specific basis. [Description provided by NIOSH]
  • Subjects:
  • Source:
    MISSING :20 pages
  • Series:
  • Subseries:
    Report of Investigations
  • Document Type:
    Text
  • Genre:
    Report
  • Place as Subject:
    United States
  • CIO:
    National Institute for Occupational Safety and Health (NIOSH)
  • Division:
    DRC - Denver Research Center
  • Topic:
    Workplace Safety & Health
  • Location:
    North America
  • Pages in Document:
    26 pdf pages
  • NIOSHTIC Number:
    nn:10005892
  • Federal Fiscal Year:
    1987
  • Peer Reviewed:
    False
  • Collection(s):
  • Main Document Checksum:
    urn:sha-512:37c51d29bae1ae14088ff7a4669590c7285f3c2a6bb55cf64d96d65af4c2b418d1c72af5ab90b5b11e6c664d683bbb26285a6dafe2125ee3f81cf35e7edd210a
  • Download URL:
  • File Type:
    Filetype[PDF - 3.07 MB ]
PREVIOUS
File Language:
English
ON THIS PAGE
Details
CDC STACKS serves as an archival repository of CDC-published products including scientific findings, journal articles, guidelines, recommendations, or other public health information authored or co-authored by CDC or funded partners.

As a repository, CDC STACKS retains documents in their original published format to ensure public access to scientific information.
BACK TO TOP