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Economical Benefits of Rock Joint Testing
Proceedings of the North American Tunneling Conference (2012, Indianapolis, IN)
  • Andre Hawks
  • Brian Asbury
  • J. David Rogers, Missouri University of Science and Technology
  • Jamal Rostami, Missouri University of Science and Technology

Quantitative joint properties are typically unknown on most rock tunnel designs. To quantify joint properties in terms of cohesion, waviness, roughness, friction angle, degree of weathering, in filling, healed material and other mechanical parameters requires joint testing, which is typically a costly proposition. But sometimes this investment in testing leads to significant cost savings. This paper will review joint properties and their impact on tunnel and shaft stability and present a sensitivity analysis performed by using Unwedge to analyze the effects of each input on the required amount of support to establish a minimum target safety factor. Factors that will be analyzed include: tunnel size, tunnel shape and trend, ground support methods and cost, and joint properties. Sensitivity curves will be offered to determine if joint testing is economically beneficial to future projects.

Meeting Name
North American Tunneling Conference (2012: Jun. 24-27, Indianapolis, IN)
Geosciences and Geological and Petroleum Engineering
Second Department
Mining Engineering
Keywords and Phrases
  • Cost Saving,
  • Economical Benefits,
  • Friction Angles,
  • Joint Property,
  • Mechanical Parameters,
  • Rock Joint,
  • Rock Tunnel,
  • Sensitivity Curves,
  • Support Method,
  • Investments,
  • Mechanical Properties,
  • Safety Factor,
  • Weathering,
  • Tunnels
International Standard Book Number (ISBN)
Document Type
Article - Conference proceedings
Document Version
File Type
© 2012 American Society of Civil Engineers (ASCE), All rights reserved.
Publication Date
Publication Date
01 Jun 2012
Citation Information
Andre Hawks, Brian Asbury, J. David Rogers and Jamal Rostami. "Economical Benefits of Rock Joint Testing" Proceedings of the North American Tunneling Conference (2012, Indianapolis, IN) (2012) p. 236 - 242
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