Results of Tests to Evaluate the Tensile Strength and the Load Bearing Capacity of Rockfall Nets According to New ISO Standards

Rockfall mitigation protection systems use meshes or ring and rope panels that can be divided in two main categories: secured and simple drapery systems. Secured drapery systems are composed of a rockfall net pinned to the slope with a pattern of nails. The goal of this solution is to stabilize the surface portion of the rock slope (with the nails) and keep in place the unstable rock material that can move between the anchors (with the mesh). The characteristics used on the net design are: the tensile strength, the load bearing resistance, as well as, the punching deformation. Simple drapery systems are composed of a rockfall net fixed at the top of the slope with anchors and cables. The purpose of this solution is to drive the unstable rock-blocs to the bottom of the slope by reducing their energy and velocity. The net is mainly designed to use its own longitudinal tensile strength. In order to characterize the mechanical properties of the nets, laboratory tests must be carried on them. Since September 2016, the tensile strength and the load bearing capacity for rockfall ring nets and cable nets can be evaluated with new ISO standards: ISO 17745 and ISO 17746. ISO standards also introduce the concept of lifespan: based on the type of environment (ISO 9223) and on the type of coating, which can allow designers to estimate the design life of the rockfall netting. These standards give the designers the ability to compare different nets produced by the same manufacturing company or by other ones. The paper outlines some results of laboratory tests carried out according to these new standards.

Language

  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; References; Tables;
  • Pagination: pp 49-60
  • Monograph Title: Proceedings of the 68th Highway Geology Symposium (HGS 2017)

Subject/Index Terms

Filing Info

  • Accession Number: 01642808
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 10 2017 5:34PM