Ground Improvement Parameters: jet_grouting
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) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| jet_grouting | gravel_FC_lt_10pct | coring | 0.6 | 0.1 | 6 | 2.5 | 1.2 | 0.3 | medium | 15 | yes | 200 | 20 | Gravels limit column diameter and homogeneity; triple-fluid system needed; large particles may deflect grout jet; column diameter smaller than in soft soils; production slower; erosion cavities in gravel zones may collapse; pre-treatment dewatering recommended | 3 | high | 0.7 | 0.3 | 2 | 0.8 | 500 | 100 |
| jet_grouting | sandy_silt | coring_and_UCS | 0.9 | 0.2 | 10 | 4 | 1.8 | 0.6 | medium | 25 | yes | 300 | 30 | Sandy silts produce larger columns and higher UCS (up to 10MPa) with cement jet grouting; single-fluid system may suffice; column diameter 0.6-1.8m typical; faster production than in clay | 5 | high | 0.85 | 0.5 | 2 | 0.8 | 1,000 | 300 |
| jet_grouting | soft_clay | coring_and_UCS_plus_inclinometer | 0.8 | 0.15 | 8 | 3 | 2 | 0.4 | medium | 30 | yes | 200 | 20 | Triple-fluid jet grouting most powerful; column dia 0.4-2.0m depending on soil type and system; UCS 0.5-10 MPa; full column replacement ratio possible in panel or block configurations; applicable in almost all soils except coarse gravel; production 4-6m/day in soft clay per rig; excess spoil management required (30-50% grout return) | 4 | high | 0.8 | 0.4 | 2.5 | 0.8 | 800 | 200 |
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