Peshawar Engineering Services

Soil Nailing Procedure
What is Soil Nailing?
Soil nailing is an economical technique used to stabilise existing slopes and construct retaining walls from the top down.

This soil reinforcement process uses steel tendons which are drilled and grouted into the soil to create a composite mass similar to a gravity wall. Shotcrete facing is typically applied, though many architectural options, such as precast panels or “green” vegetated cells, are available for permanent wall facings.

What Are the Advantages of Soil Nailing?
The process is very versatile. It is easy to shore along irregular curves and surfaces and installation methods can be modified according to constrained access. For shoring walls higher than about 10 feet, soil nailing is more feasible and more economical than driven piles. It is also quieter than driving piles. When space for shoring is limited, especially for tall retaining structures, soil nailing produces a much smaller footprint than laying back a slope.

What Are the Alternatives to Soil Nailing?
Driven piles
Lying back on a slope
Pre-excavation compaction grouting
Cut retaining walls

How is a Soil Wall Installed?
This stabilisation method reinforces existing soil or weathered rock by First excavating a pit to a depth of four to five feet and creating a vertical face along the edge of the cut. Second, drill a series of horizontal or near-horizontal holes along the face of the cut. Next, insert a threaded steel bar with centralisers into each hole. Fourth, flushing and filling each hole with cementitious grout. Finally, after the grout is cured, a bearing plate and nut are installed onto each of the nails and tightened against the face of the cut. When this sequence or “lift” is finished, the pit is excavated another five feet – extending the vertical face of the wall downwards. The process of drilling, inserting a bar, grouting, and installing plates is then repeated until the desired wall height is attained. In this way, a stabilising wall

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