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Soil nailing and guniting: practical construction aspects

Soil nailing and guniting are cost-effective techniques commonly adopted by slope designers to reinforce or stabilize common shallow slips of residual soil cut slopes or enhance slope stability when cut slopes are very high or steep with low or unsatisfactory factor of safety. Generally, soil nailing is not recommended or not cost-effective in soft or loose or saturated slopes. Basically and normally, soil nailing consists of reinforcing the slope with reinforcement bars in drilled holes with cement grout until a block of soil mass is adequately formed to resist lateral earth pressure, sliding, overturning and bearing pressure and possess overall stability. In fact, soil nailing is quite similar to reinforced earth principle. Soil nails are usually installed with nail heads to disperse potential high load concentration at nail head when the slope is very steep and high. The nailed wall or slope surface is also normally and promptly protected with gunite facing to avoid the soil between the soil nails becoming unstable, especially when the slope is very steep (greater than 670). This paper will discuss the practical construction aspects of soil nailing and guniting with particular reference to the quality controls and their respective acceptance criteria. Common factors such as improper techniques in drilling, inserting of rebar, grouting and nail head construction that can affect the performance of soil nailing, will be discussed.

Language

  • English

Media Info

  • Pagination: 10p
  • Serial:
    • Issue Number: 24

Subject/Index Terms

Filing Info

  • Accession Number: 01391147
  • Record Type: Publication
  • Source Agency: ARRB
  • Files: ATRI
  • Created Date: Aug 23 2012 5:19AM