Soil Mixing for Ground Improvement Applications | Casagrande

Soil Mixing

In-situ soil stabilisation technology for improving strength, stiffness and impermeability of weak or contaminated ground.
Overview

Overview

Soil Mixing is a ground improvement technology based on the in-situ mechanical blending of soil with a cementitious binder to create soil-cement columns or panels (soilcrete). The process enhances the geotechnical properties of weak, compressible or contaminated soils without removing large volumes of material.

The technique is performed using rotating mixing tools that penetrate the ground while injecting binder slurry. The soil and binder are thoroughly mixed, forming a homogeneous treated mass with increased strength and reduced permeability.

Depending on project requirements, Soil Mixing can be executed as:

  • Single columns
  • Overlapping columns
  • Continuous panels
  • Mass stabilisation blocks

Soil Mixing technology ensures high adaptability to different soil conditions, including clays, silts, sands and heterogeneous ground, making it suitable for foundation support, cut-off walls, excavation support and environmental remediation projects.

How it works

1

Machine positioning and alignment

The mixing rig is positioned and aligned vertically over the treatment point.
2

Tool penetration and binder injection

The rotating mixing tool penetrates the soil while cementitious binder slurry is injected through dedicated nozzles.
3

In-situ mixing process

The soil and binder are mechanically blended, creating a uniform soil-cement mixture along the depth of treatment.
4

Controlled extraction and homogenisation

During withdrawal, the tool continues mixing to ensure full homogenisation and uniform strength distribution.
5

Curing and strength development

The treated soil mass hardens over time, achieving the required mechanical and hydraulic properties.
How it works

Advantages

  • ✓ Improves strength and stiffness of weak soils
  • ✓ Reduces permeability and controls groundwater flow
  • ✓ Minimal spoil generation compared to excavation-based methods
  • ✓ Low vibration and noise, suitable for urban environments
  • ✓ Applicable to contaminated or heterogeneous soils

Limitations

  • ⚠ Strength depends on soil type and binder quality
  • ⚠ Requires precise quality control during execution
  • ⚠ Not suitable in very hard rock formations
  • ⚠ Curing time required before full structural performance is reached
  • ⚠ Achievable strength and uniformity may vary in highly heterogeneous ground conditions

Compatible Casagrande equipment

CV16-T

CV16-T

  • Rotary head RHP 10
  • Max. torque 100 kNm
  • Max. speed 69 rpm
  • Max. depth 15,9 m
  • Extraction force at sledge 200 kN
  • Crowd force at sledge 140 kN
  • Operating weight without sheet pile ~65000 kg
CV19-T

CV19-T

  • Rotary head RHP 10
  • Max. torque 100 kNm
  • Max. speed 69 rpm
  • Max. depth 18,6 m
  • Extraction force at sledge 200 kN
  • Crowd force at sledge 140 kN
  • Operating weight without sheet pile ~70150 kg
CV21-T

CV21-T

  • Rotary head RHP 10
  • Max. torque 100 kNm
  • Max. speed 69 rpm
  • Max. depth 20,6 m
  • Extraction force at sledge 260 kN
  • Crowd force at sledge 140 kN
  • Operating weight without sheet pile ~74000 kg
CV18-F

CV18-F

  • Rotary head RHP 15
  • Max. torque 150 kNm
  • Max. speed 69 rpm
  • Max. depth 17,2 m
  • Extraction force Nominal/Effective 420/335 kN
  • Crowd force Nominal/Effective 420/335 kN
  • Operating weight without sheet pile ~76100 kg
CV22-F

CV22-F

  • Rotary head RHP 15
  • Max. torque 150 kNm
  • Max. speed 69 rpm
  • Max. depth 21,4 m
  • Extraction force Nominal/Effective 420/335 kN
  • Crowd force Nominal/Effective 420/335 kN
  • Operating weight without sheet pile ~77300 kg
B420

B420

  • Max. drilling diameter 3500 mm
  • Max. drilling depth 101 m
  • Max. torque 467 kNm
  • Diesel engine power 450 kW
  • Operating weight 144 t
B470

B470

  • Max. drilling diameter 3500 mm
  • Max. drilling depth 111 m
  • Max. torque 467 kNm
  • Diesel engine power up to 563 kW
  • Operating weight 167 t