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Retaining Wall Design: CRIB WALL
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 | base width to height ratio max (dimensionless) | base width to height ratio min (dimensionless) | drainage requirement | global stability fos min (dimensionless) | height max ft (ft) | height min ft (ft) | min embedment depth ft (ft) | overturning fos min (dimensionless) | reinforcement notes | sliding fos min (dimensionless) | typical applications |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| CRIB WALL | Granular free-draining backfill; compacted in lifts within cribs | 0.8 | 0.5 | Internal drainage through crib openings; no separate system required | 1.5 | 20 | 5 | 0 | 2 | Interlocking precast concrete or timber headers and stretchers; no active reinforcement | 1.5 | Low- to medium-height walls; natural aesthetic; stream corridors; older highway walls |
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