Ground Improvement Parameters: stone_columns
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) | column diameter m max (m) | column diameter m min (m) | 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) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| stone_columns | firm_clay_Cu_gt_50kPa | compression_log_and_plate_bearing | 0.25 | 0.1 | 2 | 1.3 | 1.2 | 0.6 | low | 6 | no | 5 | 2 | Stone columns in firmer clays (Cu>50kPa); reduced effectiveness as column bulging may be limited; depth limited by equipment capacity and soil resistance; liquefaction not applicable to clays; lower settlement reduction than in soft clay | 15 | medium | 0.5 | 0.25 | 3.5 | 1.8 | 25 | 10 |
| stone_columns | hydraulic_fill | compression_log_and_SPT | 0.4 | 0.15 | 3.5 | 1.5 | 1.1 | 0.6 | low | 8 | yes | 8 | 3 | Hydraulic fills often loose and susceptible to liquefaction; stone columns primary technique for reclaimed land treatment; vibro-replacement (wet method) penetrates hydraulic fill with water jetting; column installation densifies surrounding fill; effective for island reclamation projects (Hong Kong, Singapore practice) | 18 | medium | 0.65 | 0.35 | 3 | 1.5 | 50 | 20 |
| stone_columns | silty_sand | probe_resistance_and_SPT | 0.4 | 0.15 | 4 | 2 | 1 | 0.6 | low | 10 | yes | 10 | 4 | Stone columns in silty sand; higher replacement ratios achievable; densification of surrounding soil increases relative density; liquefaction mitigation effective for silty sands (requires Sp<2.5m for >50% Dr increase); diameter slightly smaller due to ground resistance; production higher in granular soils | 20 | medium | 0.7 | 0.4 | 3 | 1.5 | 35 | 15 |
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