Geologic Factors Affecting Vibration from Surface Mine Blasting

Details

• Personal Author:
  Anderson DA ; Clark DA ; Reil JW ; Ritter AP ; Winzer SR
• Description:
  A test series of small, precisely controlled and thoroughly monitored production blasts was conducted at two quarries. In each series, all variables except delay were kept constant, as much as practically possible. The first aim of the study was to determine the effect of local geology on ground vibration. The second aim was to test several hypotheses relating the effect of millisecond delay intervals to fragmentation and ground vibration. A resonant frequency of ground vibration was shown to be related to the thickness of the overburden, in accord with a model proposed by gupta. Since the overburden geology creating this resonant vibration cannot usually be changed, two methods were tested to choose delays such that blast vibrations would destructively interfere. These methods were shown to be effective in modifying both the peak particle velocity and response spectra of ground vibration. The delay interval chosen also affects fragmentation, primarily in massive rock, with an optimum relief between holes of 2 ms/ft. Strain gauge records indicate a possible mechanism consistent with this information. [Description provided by NIOSH]
• Subjects:
  Occupational Health Safety Vibration
• Keywords:
  Blasting Fragmentation Mining Research Strain Gages Surface Mining
• Series:
  Mining Publications
• Subseries:
  Open File Report
• Publisher:
  U.S. Department of the Interior, Bureau of Mines
• Document Type:
  Text
• Genre:
  Conference Publications ; Final Contract Report
• Place as Subject:
  Minnesota ; OSHA Region 3 ; OSHA Region 5 ; Pennsylvania
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  TCRC - Twin Cities Research Center
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  1-191
• NIOSHTIC Number:
  nn:10005059
• NTIS Accession Number:
  PB86-175858
• Citation:
  Minneapolis, MN: U.S. Department of the Interior, Bureau of Mines, Contract H0222009, 1985 Sep; :1-191
• Federal Fiscal Year:
  1985
• Performing Organization:
  Vibra-Tech Engineers, Inc.
• Peer Reviewed:
  False
• Source Full Name:
  Minneapolis, MN: U.S. Department of the Interior, Bureau of Mines, Contract H0222009
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:238dff3961993ae8258691a6cf6575ea65aa021f82d10fc1e7072881b64bb556c2cb802236d3203bd654355522725853500e964c8872d40575ce5d3bf64be462
• Download URL:
  https://stacks.cdc.gov/view/cdc/206792/cdc_206792_DS1.pdf
• File Type:
  [PDF - 6.55 MB ]