Geotechnical Engineering


Geotechnical Engineering

EI Australia’s geotechnical team specialises in providing geotechnical consultation for infrastructure projects and property development.

Our team is experienced in dealing with a broad range of challenging geotechnical projects, including geotechnical investigation, land instability, deep excavations in soil and rock, groundwater management, adverse foundation and subgrade conditions, and geotechnical monitoring.

From the preliminary investigation to construction stage services, our team is motivated to provide efficient and effective advice to projects of all scope and scale.



Geotechnical Investigations

The objective of an intrusive geotechnical site investigation is to establish the subsurface conditions for a proposed development to aid in the civil and structural design, or for Development Application (DA) purposes. Each site investigation is specifically designed to suit the client’s requirements and incorporates appropriate investigation techniques for the anticipated, site-specific geology and hydrogeology.

Field investigation findings and laboratory test results are analysed and used to create a Geological/ Geotechnical Site Model, which is applied to the overall assessment of the site. Soil design parameters are then developed for commercial and residential buildings, roadways, bridges, utilities and sewage lagoons. EI Australia carries out preliminary and detailed Geotechnical Investigations in accordance with AS1726-2017 - Geotechnical Site Investigations.


Foundation Design

EI Australia can provide foundation designs which are cost effective and robust for developments from single-storey residential homes to multi-storey buildings with infrastructure.

Examples of shallow foundation options for sites with shallow stable ground conditions, include: Strip and Pad footings; Rafts; and Piled Rafts. Examples of deep foundation options for sites with deeper stable ground conditions include: Bored piers; Continuous Flight Auger (CFA) piles; Screw piles; and Driven piles.


Shoring & Retention

EI Australia is regularly involved in projects with basement structures, which require retaining structures to shore the excavations. Our team has experience in providing design options for retaining structures in excavations, including:

  • Reinforced concrete cantilever walls;
  • Anchored retaining walls; Contiguous and secant pile walls;
  • Jet grout options;
  • Post and plank;
  • Gravity walls – gabions, crib walls;
  • Reinforced Earth /Soil Structures (RSS);
  • Diaphragm Walls and Shafts; and
  • Steel sheet pile walls.


Slope Stability

EI Australia’s Geotechnical Team includes trained Slope Risk Assessors, with practical experience in the Australian Geomechanics Society (AGS) Slope Risk Assessment methodology and international experience.

Following a detailed site inspection, EI Australia utilities computer analytics capable of assessing sloping ground. Remediating slopes that may fail or have already failed forms an area of specialist in-house expertise.

We are able to provide advice on the monitoring of ground deformation such as the potential movement on deep retaining structures.

Some of the remedial measures that EI Australia’s geotechnical team can advise on include the use of:

  • Soil nails;
  • Shotcrete facing;
  • Dentition;
  • Buttressing;
  • Slope regrading; and
  • Shoring and retaining structure input.


Pavement Design

Pavement analysis and design is often carried out for the construction of new roads within new residential and industrial subdivisions; which may include, roundabouts, car parks, industrial hard stand areas and bus stops. These may include flexible and rigid (concrete) pavements.

EI Australia can also undertake pavement evaluations on existing pavements for assessment of road, pavement material and subgrade conditions and for the design of asphalt overlay. Our experienced, professional team provide options, when applicable, for new pavement configurations, making it possible for you to select a design that is both economical and practical for the intended purpose.


Drilling Services

EI Australia has in-house drilling capabilities to complete various intrusive investigative drilling. The use of our own equipment allows for faster project delivery. Our highly capable drilling team can provide drilling methodologies such as auger drilling, rotary mud and air drilling, diamond rock coring and concrete coring methods.

Further capabilities include in-situ testing in the form of Standard Penetration Testing (SPT), Dynamic Cone Penetration (DCP) Testing, packer testing, groundwater monitoring well and inclinometer installation.

Talk to us!

For more information about how EI Australia can help you with your project, contact us on (02) 9516 0722 or email

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