A new perimeter control blast design concept for underground metal/nonmetal drifting applications
By: Stephen R. Iverson, William A. Hustrulid, and Jeffrey C. Johnson
Contributors: Johnson. Jeffrey C.; National Institute for Occupational Safety and Health. Office for Mine Safety and Health Research
Series: Report of investigations -- 9691; DHHS (NIOSH) publication -- no. 2013-129.; Report of investigations (National Institute for Occupational Safety and Health) -- 9691.; DHHS publication -- no. (NIOSH) 2013-129.
Publisher: Deptartment of Health and Human Services, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, Office of Mine Safety and Health Research
Published: 2013
Place of publication: Pittsburgh, PA; Spokane, WA
Language: eng
Number of pages: 67
Subjects: Blasting; Explosives
Description: This report presents a new concept in perimeter control blasting for underground metal/nonmetal mine drifting applications focusing on the importance of the buffer holes in a blast design. The new blast design concept applies the understanding of radial damage that is caused by the buffer hole column charge. Buffer hole radial damage is defined by a practical damage limit applied to the rock lying between the buffer holes and the perimeter. A favorable comparison was made between five successful controlled blast designs and the concept of practical damage limit. This concept is easy to use and acceptance of the approach would only require mines to conduct trial blasts to test the design theory.
Notes: March 2013.

Includes bibliographical references (p. 55-60).

Also available via the World Wide Web as an Acrobat .pdf file (3.45 MB, 79 p.).
Table of contents: title: Abstract; title: Introduction; title: The practical damage radius; title: Modified ash energy (MAE) approach; title: Blast damage experiments; title: Buffer hole design concept; title: Analysis of successful perimeter control designs; title: Conclusions; title: Recommendations; title: Acknowledgments; title: References; title: Project Bibliography; title: Appendix A: Perimeter hole covolume wall pressure calculation method used for successful design examples