Ground improvement

Ground improvement techniques are used to prepare the ground for new construction projects and to reduce the risk of liquefaction in areas of seismic activity.

Keller was the first company to develop methods and equipment for the successful deep compaction of soil in the 1930s and has continued to develop the equipment and widened its application. Common soil stabilization techniques include a combination of vibro-compaction with stone, concrete or lime columns as well as soil mixing and injection systems. These techniques, some of which are shown below, have been used by Keller to improve many thousands of sites around the world.


  • A site improvement technique for granular material, Vibro-Compaction uses company-designed probe-type vibrators to densify soils to depths of up to 120 feet. Vibro-Compaction increases bearing capacity for shallow-footing construction, reduces settlements and also mitigates liquefaction potential in seismic areas.
  • Vibro-Compaction

Vibro concrete columns

  • Very weak, cohesive and organic soils that are not suitable for standard Vibro techniques can be improved by the installation of Vibro Concrete Columns. Beneath large area loads, Vibro Concrete Columns reduce settlement, increase bearing capacity, and increase slope stability.
  • Vibro Concrete Columns

Dynamic deep compaction

  • Dynamic Deep Compaction is an economic site improvement technique used to treat a range of porous soil types and permit shallow, spread footing construction. Soils are densified at depth by the controlled impact of a crane-hoisted, heavy weight (15-35 tons) on the ground surface in a pre-determined grid pattern. Dynamic Deep Compaction is also successful in densifying landfill material for the highway construction of recreational landscaping.
  • Dynamic Deep Compaction

Soil mixing

  • Typically used in soft soils, the soil mixing technique relies on the introduction of an engineered grout material to either create a soil-cement matrix for soil stabilization, or to form subsurface structural elements to support earth or building loads. Soil mixing can be accomplished by many methods, with a wide range of mixing tools and tool configurations available.
  • Soil Mixing

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staff world-wide in more than 40 countries


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Worldwide contacts

Keller is in over 40 countries across six continents

From our history


Keller is established


Keller acquired Hayward Baker (US)


Keller IPO on London Stock Exchange


Acquired Mckinney (US)


Acquired Piling Contractors (Australia)


c.10,000 employees, Acquired Bencor (North America) and Austral (Australia)