Keller has a long track record of safely working across diverse industries. Our experience and knowledge gathered globally allows us to apply a variety of techniques and solutions to varying applications. If you have a challenge that needs to be resolved, Keller has the solution.

We create real value for our clients. Experience has taught us to evaluate project conditions, set the goals and use the right techniques. This strategy helps to assure that the job gets done predictably, efficiently, safely, and reliably.

If you want faster and better results, ask us to work on the problem. Keller offer full Design and Construct Solutions.


  • Commercial
  • Government
  • Industrial
  • Institutional
  • Mining
  • Ports
  • Power
  • Public Works
  • Reclaimed Land
  • Residential
  • Transportation

Bored Piers

“Bored Piers” is an often used general description for bored pile foundations, incorporating the full range of bored piling techniques including bored piles with and without the use of casing and/or drill support fluids, and Continuous Flight Auger (CFA) methods.

Providing the widest range of methods Keller is your first choice partner to propose the right construction solution to meet the geology, access and load capacity challenges on your project.

Dam and Tailings Engineering

Keller understands dam safety is paramount, demanding specific engineering solutions to ensure dams are not compromised by leakage, earthquakes or long term stability issues.

We have developed and applied a number of soil and rock improvement techniques utilised in dam engineering to control groundwater flow beneath and around both large bodies of water.

Rock grouting can be used to form groundwater cut-off barriers below dams to prevent water seepage beneath or around the structures. We offer rock grouting from the classic “thin to thick” approach to the more recent “Grout Intensity Number” (GIN) method.

Slurry cut-off walls, excavated through soil and weak rock, are also used to control groundwater, offering the additional benefit of reduced earthworks, without compromising project requirements.

We also use a range of ground improvement methods to improve factors of safety against earthquake liquefaction and long term stability of dam structures. These include vibro stone columns, grouted vibro stone columns, jet grouting, and dynamic compaction.

Deep Excavations

Keller is able to offer the range of techniques for the construction of shoring and retaining walls for deep excavations.  As clients requirements push deeper and more complex excavations, often in an urban setting the soil and groundwater forces and pressures combine to pose significant engineering challenges.   Our design and construct capability in both piling, diaphragm walls and ground anchor technology allows us to offer bespoke designed efficient engineering solutions for your project.  On challenging projects our ability to offer the full range of methods allows us to combine techniques to optimise the design and construction methodology ensuring your construction challenges are minimised before construction commences, saving you time and money.

Befitting a business with over 50 years of experience in Australia, we know which systems work well in which soil conditions, and importantly which don’t.   You can rest assured that with Keller we will deliver.

Deep Foundations

Generally referring to depths greater than 20m Keller provides the full range of deep foundation solutions for your project.   Our  fleet of modern equipment fitted with leading edge instrumentation and control systems combined with our unrivalled experience in deep foundation design and construction ensures you receive the comfort and security of working with people who’ve been there before.

Our crews are proud to hold the world record for the deepest CFA pile constructed using modern fixed mast machinery.

Generally referring to depths greater than 20m, Keller provides the full range of deep foundation solutions for your project. Our fleet of modern equipment fitted with leading edge instrumentation and control systems combined with our unrivalled experience in deep foundation design and construction ensures you receive the comfort and security of working with people who’ve been there before. Several techniques can be employed to deliver deep foundations.
Our crews are proud to hold the world record for the deepest CFA pile constructed using modern fixed mast machinery.

Environmental Remediation

Redevelopment of previously used sites presents a number of challenges, not least when dealing with any legacy of contamination.

Planning approval often requires any leachate to be contained within the site, which can be achieved using low permeability slurry walls.

Keller can install both cement bentonite and soil-bentonite slurry cut-off walls, depending on the size of the project, the wall permeability requirement and the soil and leachate chemistry. Walls are formed to up to 20m deep using specialist backhoe excavators and deeper using crane mounted grabs.

Alternatively, installation of large diameter contiguous soil mix columns can be used to confine contaminated materials within a low permeability zone.

The Keller Group is one of the leaders in the development of Permeable Reactive Barriers. These can be combined with slurry walls to funnel leachate through active carbon filters or zero valent iron to remove contamination.

Foundation Rehabilitation

Costly demolition and rebuilding of structures when foundations reach the end of their serviceable life can be avoided by employing a number of remedial techniques offered by Keller.

Jet grouting can be used to confine rotting and degrading timber piles below structures in areas with high groundwater tables, providing a new, stronger, foundation resistant to water ingress.

For shallow pad foundations, compaction grouting can offer additional support and grouting can also be used to protect corroded sheet pile walls.

Where access is tight, particularly in buildings, underpinning using micro-piles is a fast and effective way of strengthening shallow foundations.

Ground Retention and Shoring

One of Keller’s key areas of expertise is in the field of deep basement or ground retention engineering.

With more pressure than ever before on urban space, developers are increasingly digging down to expand their buildings. We work closely with our clients to deliver affordable and buildable solutions, employing a range of specialist techniques. These include Secant Piling, Diaphragm Walls, Contiguous Piling Walls, Sheet Piles and Soil Mixing.

Soilcrete jet grouting can provide an underpinning system flush with the edge of the foundation being supported, for constructing new basements and deepening existing ones, particularly where there is insufficient room for piles.

And on sites with high groundwater levels, a combination of traditional and alternative methods – contiguous piles and jet grouting – can be used to provide both structural capacity and groundwater cut-off, improving the seal between piles at depth.

Keller has a wide range of solutions to help our clients maximise the developable area of their sites, which often means cutting into and stabilising existing slopes.

We provide a number of retention systems, including traditional bored or secant pile retaining walls supported by high capacity soil and rock anchors; design and construct soil nailed slopes; and the latest ground improvement methods to stabilise slope soils.

Keller uses both wet and dry soil mixing to stabilise slopes, the former in combination with steel sections to provide vertical retention, with or without the assistance of ground anchors; the latter in cuts to improve clay soils, with slope angles of greater than 1:1 being achievable.

We provide a design and construct service for installation of soil nails, providing an efficient and safe way to retain slopes. Combined with facade systems, these can create aesthetically pleasing facings.

Groundwater Control

Major civil engineering schemes such as highways, tunnels and projects in city centers often involve working below the water table.

Keller offers a wide range of solutions to exclude or control groundwater on these construction projects.

Permeation grouting is a classic method used in fine to coarse granular soils where cement or chemical grouts are used to reduce permeability.

Jet grouting can be used in finer grained soils to create a “Soilcrete” of extremely low permeability which can seal the perimeter of a scheme or, combined with sheet piling or secant piling, seal an excavation base with a series of short interlocking columns.

When room permits, a deep slurry cut-off wall can be an economical and environmentally friendly solution to groundwater control. These walls can be constructed to depths of up to 20m using a backhoe excavator and deeper using crane operated grabs.

Land Reclamation and Ports

Reclamation is the creation of new areas of land and is an important aspect of both on and off-shore development, from port expansion to creating new artificial islands for major bridge and tunnel crossings.

Work often requires the improvement of large volumes of soft or loose material, including dredged sand and mud.

Keller regularly uses vibro-compaction to densify large volumes of dredged sand to depths in excess of 30m. The work is performed both on land and offshore.

Dredged mud typically consisting of silt and clay, and cannot be compacted using vibratory techniques. Instead we use long term drainage or, if program is an issue, the more rapid method of using dry soil mixing.

Liquefaction Mitigation

Liquefaction of granular soils is a common problem in earthquake-prone regions. Keller can apply a number of its techniques to reduce the potential for liquefaction by densifying soils, dependent on site specific factors including the geology, likely seismic activity levels and site access and location. We advise the use of dynamic compaction and vibro-compaction to improve the whole soil mass or the use of vibro-stone columns or dry soil mixing to create dense elements in the soil mass. Discrete areas prone to liquefaction can also be treated using compaction grouting or jet grouting.

Low Headroom and Restricted Access

Urban growth and increasing land value is stimulating the re-development of existing structures.  Keller’s ability to offer bespoke design and construct low headroom and restricted access piling and foundation solutions sets us apart from the field.  The combination of our geotechnical design prowess, our range of techniques and our plant and equipment fleet means we can typically develop an efficient solution for most restricted access challenges.

Mine and Void Filling

Coal and mineral extraction has taken place for the past two centuries using a variety of methods. With exhausted workings in various states of collapse, careful consideration needs to be given to the most appropriate method of treatment for void filling.

Keller offers a bespoke design and construct service for filling these and other voids.

With our expertise in grout design, mixing and pumping and extensive experience with filling abandoned mines, we can produce a complete solution, from backfilling deep abandoned coal mines to filling and densifying collapsed Karst deposits using compaction grouting.

Soft Soil Improvement

While traditional foundations are suitable for sites with poor ground conditions, applying Keller’s expertise and experience can often produce faster and more cost-effective results.

So, as well as offering the full range of traditional deep and shallow piled foundation systems, we also provide ground improvement alternatives, wherever possible.

Ground improvement in soft soil offers a more economical approach over traditional foundations by improving the bearing pressure of the soil rather than installing piles to bypass weak layers and constructing expensive pile caps or transfer slabs. This can reduce program, cost, the amount of spoil produced and limit longer term differential settlement effects.

The solution used is determined by ground conditions, design loads, the size of treatment area and site location.

Tunnelling and Shafts

Keller has a wealth of experience in developing and providing bespoke ground engineering solutions for tunnelling projects, from major transport links to utilities.

A big engineering challenge for tunnelling contractors is how to provide stability and to control groundwater flow where tunnels enter or exit temporary and permanent access shafts.

We use Soilcrete jet grouting or permeation grouting to form zones of lower permeability or stronger ground at these critical points. These methods can also be used to improve the cover above tunnels, particularly those in rock with thin cover above the tunnel crown.

For large diameter tunnels beneath urban areas, our Soilfrac compensation grouting technique is often the most cost effective method of protecting buildings above the tunnel route. Typically used as an alternative to treating large zones of soil, the method minimises and controls settlement resulting from tunnelling, keeping differential ground movements within acceptable limits.

We also offer a number of solutions for smaller, micro tunnels such as those built for utilities. For example, dry soil mixing has been used to treat organic and very soft clay, providing ground support during major sewer construction.


Foundation settlement can often occur in structures built on loose or soft soils because of a combination of inadequate foundations, fluctuations in groundwater levels or the influence of nearby excavations.

Compaction grouting, or underpinning, densifies granular soils to provide load transfer across areas of soft soil. Grouting can be carried out before or after excavation, limiting the effects on the structure.

A big advantage of the method is the small plant used. We regularly use compaction grouting on domestic properties, as the equipment is ideal for working in restricted access and low headroom sites.

We also use Soilcrete jet grouting and microfine permeation grouting to improve soils below foundations to support greater loads or allow basement excavations.