Screw-in Soil Nailing Fact Sheet
<p><p><figure id='attachment_2626' style='max-width:696px' class='caption aligncenter'><img class="wp-image-2626 size-full" src="https://www.geoinstitute.org/sites/default/files/geotech-tools-uploads/…; alt="Cross section diagram showing screw-in soil nails." width="696" height="405" /><figcaption class='caption-text'> Screw-In Soil Nail Wall (Figure from
Shotcrete Inspection/Testing
<p><p><strong>References:<br></strong><em>Byrne et al. (1998)<br>Porterfield, Cotton, and Byrne (1994)<br>Lazarte et al. (2015)<br>Rogbeck et al. (2003)</em></p><p><strong>Method Summary</strong></p><p>Soil nail walls utilizing shotcrete need to complete shotcrete inspection. For permanent walls, shotcrete core testing should be performed. Byrne et al. (1998) Appendix C 2.2.3 describes how to extract core samples from shotcrete walls to be tested for compressive strength.
Soil Screw Retention Wall System
Reference(s):
Collin and Cowell (1998)
Surveying
<p><p><strong>References:<br></strong><em>Collin and Cowell (1998)<br>Rogbeck et al. (2003)<br>Porterfield, Cotton, and Byrne (1994)<br>Lazarte et al. (2015)<br>Byrne et al. (1998)</em></p><p><strong>Method Summary</strong></p><p>Deflections in the wall can be accurately measured over the length of the wall with surveying equipment. The site should be surveyed on a specified regular schedule in order to monitor and record any wall movements.
Tension Testing
<p><p><strong>References:<br></strong><em>Rogbeck et al. (2003)</em></p><p><strong>Method Summary</strong></p><p>This test is performed in a laboratory and functions to determine the tensile strength of the soil nail.
Verification and Proof Testing
<p><p><strong>References:<br></strong><em>Byrne et al. (1998)<br>Collin and Cowell (1998)<br>Lazarte et al. (2015)<br>Porterfield, Cotton, and Byrne (1994)<br>Rogbeck et al. (2003)</em></p><p><strong>Method Summary</strong></p><p>This method tests the strength of an individual soil nail by applying a specific load to a nail and measuring deflections and strain of the nail.
Visual Inspection
<p><p><strong>References:<br></strong><em>Collin and Cowell (1998)<br>Rogbeck et al. (2003)<br>Porterfield, Cotton, and Byrne (1994)<br>Lazarte et al. (2015)<br>Byrne et al.
West Slope Reservoir Wall, Oregon
<p><p><div><h2>Project Summary/Scope:</h2>Helical (screw-in) soil nails were used to support a temporary excavation for a year up to 40 feet high for the construction of a new reservoir. The soil nail wall is on the west side of the site and a county road is about 10 feet back from the face of the cut. The wall was approximately 120 feet long and 40 feet high. A triangular pattern was used for the layout of the nails.