Earth Support Corp

Reinforce the cut in place, top-down, one lift at a time.

Soil Nailing

We install fully grouted soil nails for top-down retained cuts — drilling, installing, and grouting bar into each excavation lift so the reinforced soil mass acts as a gravity wall, with no tiebacks or driven piles required. Nail length, spacing, and inclination follow the project's PE-stamped design; ESC's scope is installation.

Cross-section

Schematic cross-section of a top-down soil nail wall, showing four rows of fully grouted nails inclined into the retained soil behind a shotcrete facing.An illustrative section through a soil nail wall built top-down. The excavation is cut in short lifts from grade; at each lift a row of steel bars is drilled into the retained soil at a shallow downward inclination and fully grouted along its whole length, so the nails work passively rather than being stressed like tiebacks. A reinforced shotcrete facing spans between the nail heads, and each head is finished with a steel bearing plate, washer, and hex nut. The cycle repeats down to subgrade, leaving a reinforced block of ground that behaves as a gravity wall. Subsurface bands from top to bottom are urban fill, Boston blue clay, glacial till, and argillite bedrock. Schematic only, not to scale, pending professional-engineer review.Urban FillBoston Blue ClayGlacial TillArgillite / Bedrock
Schematic — illustrative, not for construction; pending PE review.

Callouts

Select a numbered part below to read what it is and what it does.

Typical spec

Plain-language view of the same typical ranges.

Nail length (typical)
0.6–1.0 × wall height
A typical range for this kind of work.Typical value — confirm against the project's geotechnical design.
Nail spacing
4–6 ft each way
A typical range for this kind of work.Typical value — confirm against the project's geotechnical design.
Drill hole diameter
4–8 in
A typical range for this kind of work.Typical value — confirm against the project's geotechnical design.
Nail inclination
10–20° below horizontal
A typical range for this kind of work.Typical value — confirm against the project's geotechnical design.

How it goes in

  1. 01

    Cut the lift

    The GC excavates a short lift — only as deep as the ground will stand unsupported long enough for the nails and facing to go in.

  2. 02

    Drill & install the nail

    Each hole is drilled into the retained soil at the design inclination and a steel bar — solid or hollow self-drilling — is installed to the design length.

  3. 03

    Grout the bar

    The hole is tremie-grouted full length so the bar bonds to the surrounding ground. Soil nails are passive: they are grouted, not stressed.

  4. 04

    Face & repeat

    Facing is placed and each nail head is finished with a bearing plate, washer, and hex nut. The cycle repeats down to subgrade.

Where it fits

  • Top-down retained cuts for below-grade structures and garages
  • Roadway, ramp, and embankment cuts
  • Stabilizing over-steep slopes and existing walls
  • Permanent retained cuts with shotcrete facing

Frequently asked

Related projects

Illustrative tear sheets — example case studies pending verification.

Ready to scope your foundation?

Tell us about the project and we'll put together a detailed quote within 3 days. We generally work with general contractors.

Get Your 3-Day Quote+1 978 846 6851
CallStart Quote