soil nailing

2.  Soil nailing is a technique used to reinforce
and strengthen existing ground
 Soil nailing consists of installing closely
spaced bars into a slope or excavation.

3.  Soil nailing evolved from the new Austrian
Tunnelling method which is a system for
underground excavations in rocks.
 This concept was also been applied to the
stabilization of rocks slopes since the early
1960s
 The first applications of soil nailing was
implemented in 1972 for a railroad widening
projects near Versailles, France.

5.  Driven nails
 Grouted nails
 Corrosion protected nails
 Jet grouted nails
 Launched nails

8.  Drilling equipments
 Grout mixing equipments
 Guniting equipments
 Compressor

9.  Steel reinforcement
 Grout mix
 Shotcrete/Gunite

10.  For corrosion protection, all steel
components shall be galvanized.
 For double corrosion protection, the PVC
corrugated pipe used shall be of good quality
and adequate thickness

11.  For conventional soil nail, the water cement
ratio of the grout mix ranges from 0.4 to 0.5.
 The resistance at grout-soil interface of nail
will significantly reduced when the grout
shrink.

12.  Shotcrete or gunite can be continuous flow
of mortar or concrete mixes projected at high
speed perpendicularly onto the exposed
ground surface by means of pneumatic air
blowing for dry mix or spraying for wet mix.

14.  With the right soil and site conditions, rapid and
economical means of constructing earth
retention support systems and retaining walls.
 Creates less noise and traffic obstructions.
 Less impact on nearby properties
 Environmental friendly .
 Grouting only once is required, saving time and
labor .
 The technique is flexible,easily modified .