Report of Investigations 8275: Instrument to Measure the Initial Deformation of Rock around Underground Openings

Details

• Personal Author:
  Beus, Michael J. ; Phillips, Earl L. ; Waddell, Galen G.
• Corporate Authors:
  United States. Bureau of Mines
• Description:
  This Bureau of Mines report describes a tunnel stress relaxation gage (tsr) developed to measure initial radial displacement around full-sized underground openings. The tsr technique was shown to be a valid concept in previous field verification tests. Sensitivity has been improved by employing a titanium alloy cantilever in the transducer head, which also permits a deeper sensor location. Use of improved fabrication methods such as stainless steel bellows and sputtering techniques and use of an environmental chamber for testing greatly increased overall reliability. A miniature data acquisition system (das) was interfaced directly to the transducer for increased versatility and containment entirely within a borehole. The present tsr system is suitable for use around full- size underground excavations, particularly machine-bored openings. Field evaluation of the improved instrumentation verified the design goals. [Description provided by NIOSH]
• Subjects:
  Mining Occupational Health Safety
• Series:
  Mining Publications
• Subseries:
  Report of Investigations
• ISSN:
  1066-5552 (print)
• Publisher:
  United States. Bureau of Mines
• Document Type:
  Text
• Genre:
  Case Report
• Rights:
  Public Domain
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  SRC - Spokane Research Center
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  47 pdf pages
• Contributor:
  Guidice, Elmer ; Brown, Arthur ; Robison, James
• NIOSHTIC Number:
  nn:10000789
• NTIS Accession Number:
  PB-279657
• Citation:
  NTIS: PB 279 657; :1-40
• Federal Fiscal Year:
  1978
• Peer Reviewed:
  False
• Source Full Name:
  NTIS: PB 279 657
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:cbc626d2b683dee232c7edf9a3c5ea62fe1235c7fa6b9c1fee7c9b3404cfee3777527f295acd961ab4340f20695252180e2da84fe459db43f93e5872d52871b1
• Download URL:
  https://stacks.cdc.gov/view/cdc/201710/cdc_201710_DS1.pdf
• File Type:
  [PDF - 1.93 MB ]