Ground Improvement Parameters: dynamic_compaction
Design parameters for ground improvement techniques — stone columns, soil mixing, jet grouting, dynamic compaction, vibro-compaction, preloading with PVDs, deep soil mixing, micropiles, and ground freezing — with bearing capacity, settlement reduction, column dimensions, applicable soils, and QC methods
| technique | applicable soil types | QC method | area replacement ratio max (dimensionless) | area replacement ratio min (dimensionless) | bearing capacity increase factor max (dimensionless) | bearing capacity increase factor min (dimensionless) | environmental impact | improvement depth max m (m) | liquefaction mitigation | modulus improvement factor max (dimensionless) | modulus improvement factor min (dimensionless) | notes | production rate m per day (m/day) | relative cost | settlement reduction factor max (dimensionless) | settlement reduction factor min (dimensionless) | spacing m max (m) | spacing m min (m) | undrained shear strength gain pct max (percent) | undrained shear strength gain pct min (percent) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| dynamic_compaction | cohesive_fill_LC_lt_0.5 | SPT_and_visual_inspection | 0.25 | 0.05 | 2 | 1.2 | low | 6 | no | 4 | 1 | Cohesive fills: limited improvement depth 6m max; fines >25% limit effectiveness; liquefaction not applicable; primary use for reducing differential settlement of heterogeneous fill; heave around impact craters indicates poor energy transfer; requires time between passes for pore pressure dissipation | 1,200 | low | 0.5 | 0.2 | 8 | 4 | 15 | 5 |
| dynamic_compaction | loose_fill | SPT_CPT_before_after_and_settlement_monitoring | 0.4 | 0.1 | 4 | 2 | low | 10 | yes | 6 | 3 | Heavy tamping with 10-30 tonne weight dropped 15-30m; influence depth D=n*sqrt(W*H) where n=0.3-0.5 (Menard); 10m max practical depth; grid pattern 3-8m spacing; 3-5 passes typical; effective for loose fills/granular soils; improvement crater diameter ~1.5-2x impact plate; post-improvement settlements measured for QC; 2000 m2/day field area; N-values increase 5-20 blows | 2,000 | low | 0.8 | 0.5 | 8 | 3 | 20 | 5 |
| dynamic_compaction | saturated_sand | SPT_CPT_before_after | 0.35 | 0.1 | 3.5 | 1.5 | low | 8 | yes | 5 | 2 | Saturated sands require drainage time between passes; pore pressure dissipation critical; reduced treatment depth due to energy absorption; liquefaction mitigation effective if relative density increases above Dr>70-75% | 1,500 | low | 0.75 | 0.4 | 7 | 3 | 15 | 5 |
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