Retaining Wall Design: MSE to TIEBACK_SHEET_PILE
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) | notes | reinforcement notes | typical applications |
|---|---|---|---|---|---|---|---|---|---|
| SOIL_NAIL | In situ competent soil or soft rock; not suitable for very soft clay cohesionless saturated soils | Drainage through perforated pipe or wick drains installed behind shotcrete facing | 1.5 | 50 | 10 | 0 | FHWA NHI-14-007 (revised GEC 7); nail lengths typically 0.7-1.0 x exposed height; global and compound stability governs design | Grouted steel bars (No. 8 to No. 10 typically) at 4-6 ft o.c. horizontal; 4-6 ft vertical; 5-20 deg downward from horizontal | Highway cut walls; slope stabilization; urban excavations |
| 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 | Embedment = 0.3-0.5 x exposed height in medium stiff soils; tieback anchors common above 15 ft | 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 |
| TIEBACK_SHEET_PILE | Granular or stiff cohesive soils; avoid very soft clay | Sheet pile provides earth/water cut-off; drain through weep holes above water | 1.5 | 80 | 20 | 0.2 | Temporary vs permanent design per ACI 318 / AISC; vertical spacing 8-15 ft typical; FHWA GEC-4 tieback design | High-capacity grouted anchors or strand tendons; unbonded length bypasses failure plane; locked off at design load | Deep urban excavations; permanent basement walls; bridge construction |
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