Soil Nail Walls
Soil nail walls reinforce cut faces and slopes as excavation advances in controlled lifts.
Pacific coordinates drilling, grouting, drainage, reinforcement, shotcrete, testing, and face access with the excavation sequence so each lift can be completed safely and handed off cleanly.
How Soil Nail Walls Work
A soil nail wall is built from the face as excavation progresses. Nails are drilled and grouted into the retained soil, then connected to drainage, reinforcement, and shotcrete facing before the next lift is opened.
The method fits sites that can maintain a stable work face and top-down sequence. Unlike prestressed tiebacks, soil nails are passive reinforcement, so movement limits, surcharge, easements, groundwater, and lift height must be considered early.
When to Use Soil Nail Walls
Soil nails work best when the excavation can be advanced in lifts and each exposed face can remain stable long enough to install nails, drainage, reinforcement, and shotcrete. The method becomes less attractive when groundwater, loose running soils, overhead or bench constraints, or sequencing prevent safe face access.
Roadway And Embankment Cuts
Soil nail walls can support widening, slope stabilization, and roadway-adjacent earth retention where staged excavation is practical.
Reservoir And Utility Excavations
Circular, curved, or constrained excavations may benefit when wall geometry and access support repeated lift construction.
Building And Campus Excavation Support
Soil nails and shotcrete can stabilize temporary or permanent excavation faces for public, education, and commercial work.
Geometry With Practical Nail Lengths
Soil nail design still needs room behind the face; property lines, utilities, easements, and adjacent structures need to be checked early.
Shotcrete-Faced Wall Conditions
The method fits when shotcrete facing, drainage, reinforcement, and finish requirements align with the design intent.
Equipment and Tooling
Soil nail work typically uses small-diameter drilling equipment, grout support, reinforcement handling, and shotcrete placement coordinated around the excavation face. The right setup depends on wall height, bench width, nail length, drilling angle, ground conditions, access, and whether the wall is temporary or permanent.
Selected to reach the wall face and required nail angles without creating access conflicts.
Review EquipmentNail installation depends on controlled grout placement, records, and coordination with the drilled-hole conditions.
Discuss ScopeDrainage, reinforcement, bearing plates, and facing placement need to be sequenced with each excavation lift.
Review ShotcreteFinal equipment selection depends on wall geometry, lift sequence, nail layout, ground conditions, grout requirements, shotcrete access, and drainage details.
Project Experience
These projects show how wall geometry, drainage, access, and staged excavation shape soil nail work.
Grants Pass, OREGON / Water & Wastewater Treatment Meadow Wood Reservoir
Working for HPC Civil, Pacific Foundation installed three rows of soil nails totaling 5,084 linear feet and 5,660 square feet of Geobrugg facing for the curved reservoir excavation.
View project
West Linn, OREGON / Public Works Willamette Drive Soil Nail Wall
Pacific Foundation designed and installed a combo wall with soil nails and eco blocks for the Willamette Drive improvements near Athey Creek Middle School.
View project
Portland, OR / Public Buildings Multiple Pathways to Graduation Building
Pacific Foundation installed soil nail anchors and shotcrete facing to stabilize the site and support the building work.
View projectPacific can review similar soil nail and shotcrete requirements during estimating.
Pacific Capabilities
Pacific reviews the drawings, excavation lifts, drainage, shotcrete requirements, utilities, testing, and work-face access before mobilization. That review helps contractors avoid conflicts once the wall is exposed.
Soil Nail Wall FAQs
When is a soil nail wall a good fit?
Soil nail walls fit best when excavation can proceed in lifts, the exposed face can stand long enough for drilling and shotcrete, and the wall geometry allows practical nail lengths. They are often considered for slopes, roadway cuts, reservoir excavations, and constrained shoring scopes.
How are soil nails different from tiebacks or ground anchors?
Soil nails are generally passive reinforcement installed as the excavation advances. Tiebacks or ground anchors are typically prestressed to actively restrain a shoring system. The right choice depends on retained height, movement tolerance, property limits, easements, surcharge, soil conditions, and the excavation sequence.
What site conditions can make soil nail walls difficult?
Poor temporary stand-up soils, groundwater seepage, loose running ground, utility conflicts, difficult access, or an impractical excavation sequence can create problems. Those conditions need to be reviewed before assuming soil nails are the simplest wall option.
Are soil nail walls temporary or permanent?
They can be designed for temporary excavation support or permanent earth retention, depending on the project requirements. Permanent walls require close attention to facing, drainage, corrosion protection, finish expectations, testing, and documentation.
What information does Pacific need to review or price soil nail work?
Send shoring or excavation plans, wall geometry, retained heights, nail schedule if available, geotechnical report, specifications, site constraints, groundwater information, adjacent structures or utilities, schedule, and testing or documentation requirements.
How does shotcrete fit into a soil nail wall?
Shotcrete is commonly used as the wall facing. It supports the face between nails and ties the reinforcement, drainage, and nail heads into a working wall system. The shotcrete scope should be coordinated with excavation lifts and wall acceptance requirements.
Can soil nail walls be used near roads, wetlands, buildings, or utilities?
They can be considered near sensitive adjacent uses, but the constraints need careful review. Access, drainage, nail lengths, easements, traffic staging, utilities, and environmental requirements can determine whether soil nails are practical or whether another shoring method is better.
Discuss Your Soil Nail Scope
Send the excavation plans, shoring drawings, geotechnical report, wall geometry, groundwater information, access constraints, and schedule. Pacific will review method fit and the sequence needed to build the wall.