Geotechnical Engineering Teamx

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

The 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.

Range of Geotechnical Services

EI Australia provide Geotechnical Engineering services and professional support in the following areas:

  • Geotechnical investigation and reporting
  • Lot classification in accordance with AS2870-2011 for shallow footing design
  • Foundation design and excavation shoring design
  • Pavement assessment and earthworks design
  • Slope stability and rock face stability assessments
  • Groundwater infiltration and groundwater management
  • Salinity, thermal resistivity, durability assessments
  • Finite Element Analysis (FEA) for impact assessment of construction on neighbouring structures, using software such as PLAXIS 2D & 3D, Seep/W and Slope/W
  • Vibration, settlement, groundwater, and lateral earth movement monitoring
  • Construction QA/QC services, including inspections and certifications
  • Construction aggregate, quarry and borrow studies.
Rockface inspection and stability analysis

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.

Shrinkage crack in residual Clay overlying Ashfield Shale formation

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.

Deep excavation works with concrete sheet piled site

Slope Stability

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

After a detailed site inspection, EI Australia is able to conduct computer analysis capable of assessing sloping ground. Remediating slopes that may fail or have already failed forms an area of specialist in-house expertise.

We can additionally provide advice on the monitoring of ground deformation such as the potential movement on deep retaining structures.

Some 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.

Shoring & Retention Systems

EI are regularly involved in projects with basement structures, which require retaining structures to shore the excavations. We have 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, cribwalls;
  • Reinforced Earth /Soil Structures (RSS);
  • Diaphragm Walls and Shafts; and

Steel sheet pile walls.

Inclinometer assessment

Pavement Design

Pavement analyses 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 carry out pavement evaluation 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 economical and practical for your purpose.

Drilling Services

EI Australia has an in-house drilling rig which has capabilities to complete various intrusive investigative drilling. Our highly capable track mounted Hanjin geotechnical rig includes 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, groundwater monitoring well and inclinometer installation.