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Retaining Wall Design: SOLDIER PILE LAGGING
Typical design parameters for common retaining wall types — height ranges, base width ratios, embedment depth, stability factors of safety, backfill and drainage requirements
| wall type | backfill requirement | drainage requirement | global stability fos min (dimensionless) | height max ft (ft) | height min ft (ft) | min embedment depth ft (ft) | reinforcement notes | typical applications |
|---|---|---|---|---|---|---|---|---|
| SOLDIER PILE LAGGING | Cohesive or granular soils; not suitable for soft clays or high water table without dewatering | Dewatering or cut-off wall required in high water table; no wall drainage per se | 1.5 | 40 | 10 | 0.3 | H-piles or pipe piles at 6-10 ft spacing; timber or precast concrete lagging installed as excavation proceeds | Top-down construction; urban excavation support; building adjacent excavations |
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