Rock Mass Characterization For Excavations In Mining And Civil Engineering; Proceedings Of The International Workshop On Rock Mass Classification In Underground Mining
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.
 
 
i

Superseded

This Document Has Been Replaced By:

i

Retired

This Document Has Been Retired

i

Up-to-date Information

This is the latest update:

Rock Mass Characterization For Excavations In Mining And Civil Engineering; Proceedings Of The International Workshop On Rock Mass Classification In Underground Mining
  • Published Date:

    5/1/2007

  • Language:
    English
Filetype[PDF-2.02 MB]


Details:
  • Personal Author:
    Barton, Nick, PH.D.
  • Description:
    When the Q-system was launched in 1974, the name referred to rock mass classification, with focus on tunnel and cavern support selection. Besides empirical design of support, the Q-value, or its normalized value Qc, has been found to correlate with seismic P-wave velocity, with deformation modulus, and with deformation. The Q-system provides temporary or permanent support for road, rail, and mine roadway tunnels and for caverns for various uses. It also gives relative cost and time for tunnel construction for a complete range of rock qualities. There are also indications that Q has captured important elements of the cohesive and frictional strength of rock masses, with Qc resembling the product of rock mass cohesion and rock mass friction coefficient.
  • Subject:
  • Collection(s):
    National Institute for Occupational Safety and Health
  • Main Document Checksum:
  • File Type:
  • Supporting Files:
    No Additional Files
No Related Documents.

You May Also Like:

  1. Filetype[PDF - 2.02 MB]
    Personal Author:
    Burgess-Limerick, Robin; Steiner, Lisa;
    Published Date:
    0/1/1900
    Description:
    In 2004, there were 646 underground coal mines in the USA employing 37,445 miners. These mines reported 3556 injuries to MSHA that year - 17% were associated with bolting machines (593 injuries), 8% with continuous miners (283 injuries), and 4% each ...
    File Type:
    Filetype[PDF - 2.02 MB]
  2. Filetype[PDF - 1.81 MB]
    Personal Author:
    Torma-Krajewski, Janet; Steiner, Lisa; Lewis, Pauline; Gust, Paul; Johnson, Kean;
    Published Date:
    0/1/1900
    Description:
    Since 1990 and the publication of the Ergonomics Program Management Guidelines for Meatpacking Plants by the US Occupational Safety and Health Administration, numerous reports of companies implementing ergonomics program have been published. However,...
    File Type:
    Filetype[PDF - 1.81 MB]
  3. Filetype[PDF - 423.53 KB]
    Personal Author:
    Whyatt, J.; Varley, F.;
    Published Date:
    1/1/2009
    Description:
    A variety of dynamic failure cases with regional impact were described at a bump symposium held in 1958. These types of events, while rare, are of particular interest because their ability to impact a large area has disaster potential. These cases ca...
    File Type:
    Filetype[PDF - 423.53 KB]
  4. Filetype[PDF - 467.25 KB]
    Personal Author:
    Peters, Robert H.; Fotta, Barbara; Mallett, Launa G.;
    Published Date:
    0/1/1900
    Description:
    Due to variations in the thickness of U.S. coal seams, there is great variability in the height of the roof where underground miners work. Restrictions imposed by low seam heights have important safety consequences. As the height of their workplace d...
    File Type:
    Filetype[PDF - 467.25 KB]
  5. Filetype[PDF - 2.55 MB]
    Personal Author:
    Mallett, Launa; Vaught, Charles; Bmick, Michael J ,Jr.;
    Published Date:
    0/1/1900
    Description:
    Since 1991 the Pittsburgh Research Center (PRC formerly part of the U. S. Bureau of Mines) has been tapping u valuable resource-researchers have recorded extensive interviews will, 30 individuals who are recognized as experts in the area of mine emer...
    File Type:
    Filetype[PDF - 2.55 MB]