Effect of the Dip and Excavation Orientation on Roof Stability in Moderately Dipping Stone Mine Workings

Details

• Journal Article:
  Alaska Rocks 2005, Proceedings of the 40th U.S. Rock Mechanics Symposium, Anchorage, Alaska, June 25-29, 2005
• Personal Author:
  Esterhuizen, Gabriel S. ; Iannacchione, Anthony T.
• Description:
  Underground limestone mines typically use the room-and-pillar method of mining in the generally flat-lying limestone formations. In some cases, the dip may exceed 5 deg, which can result in unique roof instability problems. Stability may be further exacerbated by the presence of horizontal tectonic stresses. Field studies and numerical model analyses are combined to assess the effect of the dip in various stress conditions. The results showed that where the horizontal tectonic stresses are sufficient to cause intact rock failure, increasing dip results in increased failure potential. The effect of the dip is greater when the maximum horizontal stress is parallel to the dip. Two case studies are presented and evaluated against the findings of stress analysis results. The study showed that the empirical rules of orienting headings parallel to the maximum stress are generally applicable to dipping excavations, except when mining in the up-dip direction. The importance of accurately determining the orientation of the maximum horizontal stress is emphasized because the window of favorable orientations relative to the stress is small. [Description provided by NIOSH]
• Subjects:
  Geology Mining Occupational Health Preceptorship Safety
• Keywords:
  Underground-mining; Rock-falls; Safety-research; Injuries; Stone-mines; Mining-industry; Room-and-pillar-mining; Geology; Field-Study; Models; Horizontal-stress; Limestone; Nonmetal-mining; Hazards; Ground-control
• Source:
  Alaska Rocks 2005, Proceedings of the 40th U.S. Rock Mechanics Symposium, Anchorage, Alaska, June 25-29, 2005. Alexandria, VA: American Rock Mechanics Association (ARMA), Paper No. ARMA/USRMS 05-743, 2005 Jun; :1-8
• Series:
  Mining Publications
• ISBN:
  9781604234541
• Publisher:
  American Rock Mechanics Association (ARMA)
• Document Type:
  Text
• Genre:
  Proceedings
• Place as Subject:
  Alaska ; OSHA Region 10 ; OSHA Region 3 ; Pennsylvania
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  PRL - Pittsburgh Research Laboratory
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  8 pdf pages
• NIOSHTIC Number:
  nn:20028123
• Contact Point Address:
  G.S. Esterhuizen, NIOSH Pittsburgh Research Laboratory, P.O. Box 18070, Pittsburgh, PA 15236
• Editor(s):
  Chen G; Huang S; Zhou W; Tinucci J
• Federal Fiscal Year:
  2005
• NORA Priority Area:
  Disease and Injury: Traumatic Injuries
• Peer Reviewed:
  False
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:297620551f10a19ff0469c1cc82102eb2a96729df2002cb11da64db18b9a7c58baccc7332fd4df7beac75c7fa2a9c58abd52a06004161b69f3b68e375d8fa33b
• Download URL:
  https://stacks.cdc.gov/view/cdc/8737/cdc_8737_DS1.pdf
• File Type:
  [PDF - 1007.41 KB ]