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Deep foundation services

Deep Foundation Services

Comprehensive guide to every major deep foundation and earth retention method used in modern construction.

Micropiles

Small-diameter, high-capacity piles for restricted access and difficult soil conditions.

20–200 feet depth • 50–500+ tons (compression and tension)

Helical Piers

Screw-in foundation elements for fast installation with immediate load capacity.

10–100 feet depth • 25–200+ tons (compression and tension)

Drilled Shafts & Caissons

Large-diameter cast-in-place concrete piles for the highest structural loads.

30–200+ feet depth • 100–5,000+ tons

Sheet Piling

Interlocking steel sheets driven to create continuous retaining walls and cofferdams.

15–80 feet embedment depth • Varies by section — wall bending capacity 10–200+ in³/ft section modulus

Soil Nailing

Passive steel reinforcement installed into existing soil to stabilize slopes and excavations.

15–60 feet nail length; walls to 80+ feet height depth • 15–50 tons per nail (pullout capacity)

Tieback Anchors

Pre-stressed ground anchors providing active lateral support for retaining structures.

30–150 feet total length (free + bond length) depth • 50–500+ tons per anchor

Underpinning

Extending existing foundations to greater depth or capacity to arrest settlement.

5–100+ feet below existing footing (method dependent) depth • Varies by method — 25 to 500+ tons per underpinning point

Soldier Pile & Lagging

Steel beams with timber or concrete lagging for temporary and permanent excavation support.

Pile embedment 10–30 feet below excavation; wall heights to 50+ feet depth • Depends on pile section and bracing — typically supports 15–50 feet of soil

Soil Stabilization

Ground improvement techniques that strengthen weak soils in place without structural piles.

5–60 feet depending on method depth • Improved bearing capacity typically 2–10× original soil strength

Slope Stabilization

Engineering solutions to prevent landslides and stabilize unstable slopes.

Varies — drainage 10–100 ft; soil nails 15–60 ft; micropiles 30–150 ft depth • Target factor of safety typically 1.3–1.5 for permanent slopes