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has become very popular over the past two decades especially in embankment stabilisation
works associated with motorway widening and railway embankment stabilisation.
It is especially useful for sites with difficult access as the drilling and grouting equipment is
typically compact and light.
Soil nailing rigs can be purpose built or attachments mounted on suitable hydraulic excavators.
The hollow stem self-drill type anchors/soil nails are very popular as they are exceptionally quick
and easy to install.
With , grout is initially used as a flushing medium and finally as the
permanent body of the structural nail.
After drilling the nail is tremmie grouted and they are normally used in conjunction with a soil
retention system such as a geogrid, steel mesh or similar product. This is sometimes overlain by
topsoil (possibly retained by a geoweb) or directly seeded for the cultivation of grass.
In civil engineering today this technique is used to...
1. Strengthen defective structural masonry and arch bridges
2. Consolidate or reduce water seepage through a mass of rock
3. Increase bearing capacity or reduce settlement in granular soils
4. Construct a watertight curtain or cut-off in a permeable stratum, e.g. around a reservoir or below a dam structure
5. Underpin defective foundations of existing structures showing excessive settlement
6. Fill cavity walls of existing buildings to provide a fire break
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