Case Histories On Light Anchor Post System For Flexible Barriers

Geohazard mitigation has a well-established testing guideline for flexible fence for rockfall protection, like the European testing guideline ETAG 027 or the USA guideline NCHRP 20-07 Recommended Procedures for the Testing of Rockfall Barriers. These two test procedures describe very well the functionality of a rockfall barrier and describe all the steps necessary to carry out a full scale test and consequently outline the deformability, resistance, performance and forces acting on the anchor post system of a deformable rockfall fence. The anchor post system (foundation) is not considered as part of these testing guidelines. Designers must design the anchoring system considering the different national standards and the geotechnical characteristics of the site. Oftentimes problems arise from the post anchor system, due to remote access to site locations. Not only does a remote location interfere with the operation of heavy machinery, but transportation is also very difficult. In these situations, the anchor post system can become more expensive than the fence itself, which could result with a rejection of the rockfall barrier, due to the high global cost of the intervention. When a severe rock impact damages a barrier, for safety reasons, a large portion of the structure must be replaced and oftentimes the anchoring system should also be replaced. Then the question becomes whether or not heavy anchor post systems make sense. This paper presents case studies of Maccaferri rockfall barriers impacted by several blocks. Even though the fences were installed with unusual light post anchoring systems, the fences were able to withstand impacts exceeding their nominal capacity. The analysis of the structure suggests that in certain conditions, displacement and settlement on the anchor post systems represent a benefit.

Language

  • English

Media Info

  • Media Type: Digital/other
  • Features: Bibliography; Figures; Photos;
  • Pagination: pp 163-176
  • Monograph Title: Proceedings of the 65th Highway Geology Symposium (HGS 2014)

Subject/Index Terms

Filing Info

  • Accession Number: 01640001
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 24 2017 12:34PM