All That You Should Know About Soil Nailing

Written by jessicaolien on 30. April 2018 11:36 o'clock

    

In natural or excavated slopes, a ground stabilisation is needed which is done by using soil nailing technique. In this technique, drilling is done for steel bars which are to be inserted on the face of slope face and then to be grouted. In order to hold the slope face in proper position, mesh is attached to the ends of the bar.

Few other applications of soil nails are as follows:

  • Tunnel portals
  • Temporary excavation shoring
  • Under bridge abutments
  • Roadway cuts
  • Reconstruction and repair of the present structures

Based on the condition of ground and other suitability's like geosynthetic materials, ground anchors and cost involved, the decision of soil nailing is taken. Soil nailing can be done on different kinds of soils however it is preferable that soil should able to stand without any support up to the height of one to two meter for at least two days when it is cut vertically.
Following types of soils are suitable for soil nailing

  • Clays
  • Silty clays
  • Sandy clays
  • Clayey silts
  • Sandy silts
  • Glacial soils
  • Sand
  • Gravels

Following types of soils are not well suited for soil nailing

  • Soil with high groundwater table
  • Soft fine graded soils
  • Cohesion less soils
  • Loess
  • Highly corrosive soils
  • Loose granular soils
  • Ground which is exposed to repeated thaw action

Some of the limitations of using soil nailing are

  • For soils whose shear strength is low, very high density of soil nailing will be needed
  • For sensitive and expansive soils, soil nailing is not suitable for permanent use
Drainage system can be placed after the nails have been placed.

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