An Innovative Laboratory Box for Testing Nail Pull-Out Resistance in Soil

Many slopes in Hong Kong are stabilized using soil nails. The interface shear strength between a soil nail and the surrounding soil is a key parameter for stability and serviceability assessment of the slope. This paper introduces a new soil nail pull-out box with full instrumentation for investigating the soil nail pull-out shear resistance under different controlled conditions. This paper presents details of the new pull-out box, from design, boundary effect analysis, and instrumentation to setup. The new box has the following features: (a) comprehensive transducers are installed, (b) an extension chamber is provided to house an extension part of the soil nail to keep the nail length inside the box constant throughout the testing, (c) a waterproof front cap is placed to cover and seal the soil nail head so that back water pressure can be applied to accelerate the saturation of the soil, and (d) a pressure grouting apparatus is constructed to make it possible to investigate the influence of the cement grouting pressure. The pull-out box can be used to study influences of hole drilling process and stress release; degree of saturation of the soil; cement pressure grouting; and overburden pressure. Two copies of the new soil nail pull-out box have been constructed to accelerate the testing program. Results from a series of soil nail pull-out tests using the two boxes were found to be reliable, accurate and meaningful.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/01496115
• Authors:
  • Yin, Jian-Hua
  • Su, Li-Jun
• Publication Date: 2006-11

Language

• English

Media Info

• Media Type: Print
• Features: Figures; Tables;
• Pagination: pp 451-461
• Serial:
  • Geotechnical Testing Journal
  • Volume: 29
  • Issue Number: 6
  • Publisher: ASTM International
  • ISSN: 0149-6115
  • EISSN: 1945-7545
  • Serial URL: https://www.astm.org/products-services/standards-and-publications/geotechnical-testing-journal.html

Subject/Index Terms

• TRT Terms: Boreholes; Design; Grouting; Instrumentation; Laboratory tests; Overburdens; Product development; Pull out test; Saturated soils; Shear strength; Slope stability; Slopes; Soil nailing; Testing equipment
• Uncontrolled Terms: Boundary effects; Pull-out box
• Geographic Terms: Hong Kong (China)
• Subject Areas: Design; Geotechnology; Highways; I42: Soil Mechanics;

Filing Info

• Accession Number: 01041879
• Record Type: Publication
• Files: TRIS
• Created Date: Feb 1 2007 8:29AM