An Improved Calculation Method to Design Flexible Facing System for Soil Nailing

According to the experience of several authors, under certain conditions soil nail facing systems can be developed with nails using steel mesh fabric (flexible structural facing). The goal of this system is to improve slope face stability and allow vegetation to grow. A simple design approach was introduced a few years ago that analyzed the behavior of the mesh by comparing the maximum volume of debris that can move among the nails to the maximum volume that can be held by the mesh. Even if it took into account the real interaction between mesh and soil, the procedure was only rudimentary in solving the non-linearity of the load-displacement problem. Recently, a new design approach using forces generated by the soil pushing on the mesh was proposed, considering the most unfavorable case between a two wedge analysis and a single wedge, as the slope failure mode (according to the standard BS 8006 – 2011). Concerning the mesh resistance, thanks to the library of load-displacement curves for different mesh types generated by the new UNI 11437 Standard, and the introduction of the “scale effect” that modifies nail spacing and mesh behavior accordingly, the new software overcomes the non-linearity of the problem and allows a more realistic calculation approach. While the methodology is not perfect, it at least allows consideration of the Ultimate Limit State and the Serviceability Limit State through a simple calculation. This paper analyzes the main calculation steps and concepts implemented in the new Bios 2 software design approach which is used by Maccaferri for design of flexible facings for cut and natural slopes.

• Record URL:
  http://www.highwaygeologysymposium.org/wp-content/uploads/66_HGS-OPT.pdf
• 
• Supplemental Notes:
  • Copyright © 2015 Highway Geology Symposium (HGS). Abstract reprinted with permission of the HGS.
• Corporate Authors:

  Highway Geology Symposium

  ,   United States 
• Authors:
  • Cerro, Marco
  • Giacchetti, Giorgio
  • Brunet, Ghislain
  • Savioli, Alessio
  • Grimod, Alberto
• Conference:
  • 66th Highway Geology Symposium
  • Location: Sturbridge Massachusetts, United States
  • Date: 2015-9-14 to 2015-9-17
• Publication Date: 2015

Language

• English

Media Info

• Media Type: Digital/other
• Features: Figures; Photos; References;
• Pagination: pp 591-610
• Monograph Title: Proceedings of the 66th Highway Geology Symposium (HGS 2015)

Subject/Index Terms

• TRT Terms: Anchor plates; Equilibrium methods (Structural analysis); Facings; Soil nailing; Soil stabilization; Wire mesh
• Uncontrolled Terms: Limit equilibrium method; Meshes
• Subject Areas: Geotechnology; Highways; Planning and Forecasting;

Filing Info

• Accession Number: 01638280
• Record Type: Publication
• Files: TRIS
• Created Date: Jun 21 2017 5:16PM