A Rock Mass Rating Scheme For Clastic Sediments Based On Geophysical Logs; Proceedings Of The International Workshop On Rock Mass Classification In Underground Mining

Details

• Personal Author:
  Hatherly, Peter J., PH.D. ; Medhurst, Terry P., PH.D. ; MacGregor, Stuart A.
• Description:
  In addition to fractures and joints, compositional factors and bedding influence the strength of clastic sedimentary rocks. Rock mass rating schemes must therefore consider all of these factors. In this paper, a rating scheme for clastic sediments based on geophysical measurements is described. Geo-physical logging allows an approximation of rock com-position to be obtained and an assessment of bedding frequency and laminations. Velocity measurements incorporate the effects of fracturing. The rating requires scores for the intact rock, bedding/cohesion, and defects. These are combined to yield a Geophysical Strata Rating (GSR). Determination of the GSR is objective and repeatable. GSR values are typically between 20 and 80 and can be related to the Coal Mine Roof Rating.
• Subjects:
  NIOSH
• Document Type:
  Text
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• NIOSHTIC Number:
  nn:na
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:560ae7d0963e13ae37708255f7790adc723c93ac48bbeeeffc18b68009915c7d6c2abe71b8739c79971a94d0648de9d3ffac556c1cced1d1092a20ec6f01a8e9
• Download URL:
  https://stacks.cdc.gov/view/cdc/8480/cdc_8480_DS1.pdf
• File Type:
  [PDF - 320.94 KB ]