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Examining Pull-Out Tests for Grouted Rib Bolts: A Comprehensive Analysis

Public Domain


Details

  • Personal Author:
  • Description:
    Resin-grouted bolts serve as a crucial means of stabilizing yielded coal ribs in underground coal mines. A comprehensive investigation into their efficacy was undertaken by a collaborative effort between the National Institute for Occupational Safety and Health (NIOSH) and Missouri University of Science and Technology (MST). This study involved pull-out tests in multiple locations, including six coal mines and the NIOSH research mine. A total of seventy-three (73) tests were conducted, of wide range of anchorage lengths, ranging from a short encapsulation length of 0.305 m to a fully grouted encapsulation length of 1.524 m. The test findings indicate that when short encapsulation bolts are installed at high rotation speeds, their anchorage capacity is significantly reduced, leading to failure at the bolt-grout interface. Conversely, when these bolts are installed at lower rotation speeds, they exhibit greater capacity, with failure occurring at a higher anchorage load equivalent to the yield load of steel rebar. No matter what the rotational speeds were used during bolt installation in this study, the fully grouted bolts consistently experienced failure at the ultimate load of the steel rebar. Most of the tests carried out on partially grouted bolts with anchorage lengths of 0.610 - 0.914 m have shown behavior patterns like the fully grouted bolts, although exhibiting reduced stiffness. The outcomes of this research offer a profound insight into the ways in which resin-grouted bolts enhance the stability of coal mine ribs. [Description provided by NIOSH]
  • Subjects:
  • Keywords:
  • Series:
    Mining Publications
  • Publisher:
    Society for Mining, Metallurgy & Exploration (SME)
  • Document Type:
    Text
  • Genre:
    Proceedings
  • Place as Subject:
  • CIO:
    National Institute for Occupational Safety and Health (NIOSH)
  • Division:
    PMRD - Pittsburgh Mining Research Division
  • Topic:
    Workplace Safety & Health
  • Location:
    North America
  • Pages in Document:
    1-10
  • NIOSHTIC Number:
    nn:20069440
  • Citation:
    MineXchange: 2024 SME Annual Conference & Expo, February 25-28, 2024, Phoenix, Arizona, preprint 24-037. Englewood, CO: Society for Mining, Metallurgy & Exploration, 2024 Feb; :1-10
  • Federal Fiscal Year:
    2024
  • NORA Priority Area:
    Mining
  • Peer Reviewed:
    False
  • Source Full Name:
    MineXchange: 2024 SME Annual Conference & Expo, February 25-28, 2024, Phoenix, Arizona, preprint 24-037
  • Collection(s):
  • Main Document Checksum:
    urn:sha-512:e74a4e96a05ad15ce02d6299fe103394e9611d86eb241b301b4b278695db090afc9132be60fbd43245e3b478095a695ea2d8188824fd86d22159c4414d4f64de
  • Download URL:
  • File Type:
    Filetype[PDF - 1.71 MB ]
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