PROJECTS

GEOTECHNICAL ENGINEERING SERVICES

Residential Developmentx

SCOPE:
Residential Development

CATEGORY:
Geotechnical Engineering

LOCATION:
Camperdown, NSW

REDEVELOPMENT OF A 7000 M2 SITE

Redevelopment of a 7000 m2 site including construction of nine residential buildings up to seven-storeys high over two basement levels. Site challenges involved uncontrolled fill up to 6 m depth under the building footprints, varying geology across the site and proximity to two major roads, which required direct consultation with NSW Roads and Maritime Services (RMS).

Investigations involved borehole drilling, test pit excavation, site mapping and laboratory testing. EI Australia formulated a detailed site model and provided design advice for foundations and basement retention. EI Australia also carried out the detailed design of a soil nail wall approximately 150 m long and up to 8 m high and underpinning of a neighbouring eight-storey structure.

Value Added / Beneficial outcomes for Client:

Achieved.

Residential Developmentx

SCOPE:
Residential Development

CATEGORY:
Geotechnical Engineering

LOCATION:
Randwick, NSW

ST BASILS AGED CARE FACILITY

EI Australia provided geotechnical services for the construction of an aged care facility comprising 73 independent living units and 113 residential aged care beds. The site was underlain by a layer of aeolian sand deposits up to 12 m thick with elevated groundwater levels.

Basement retention had to be designed to limit ground movement, which had the potential to damage heritage structures adjacent to the excavation. EI’s team reviewed existing geotechnical data for the site and designed working platforms and temporary roadways for construction plant.

EI Australia supervised the successful installation of a contiguous shoring pile retention system and foundation piles for the development.

Value Added / Beneficial outcomes for Client:

Achieved.

Residential Developmentx

SCOPE:
Residential Development

CATEGORY:
Geotechnical Engineering

LOCATION:
Horningsea Park, NSW

RESIDENTIAL SUBDIVISION

This project involved a detailed geotechnical assessment of a 12 ha residential subdivision on a flood-prone site. The area was also subject to high salinity risk with environmentally sensitive vegetation along an existing creek line. Intrusive investigations were by mechanical auguring, test pitting and dynamic cone penetrometer and salinity testing.

EI Australia’s report included recommendations for design and construction of foundations, retention systems, pavements and excavation support considering the presence of saline and dispersive soil types. The advice was provided on the management of saline soils in accordance with the Western Sydney Salinity Code of Practice prepared by the Western Sydney Regional Organisation of Councils (WSROC).

Value Added / Beneficial outcomes for Client: 

Achieved.

Residential Developmentx

SCOPE:
Residential Development

CATEGORY:
Geotechnical Engineering

LOCATION:
The Entrance, NSW

BASEMENT RETENTION AND FOUNDATION DESIGN

EI Australia assessed soil and rock conditions in order to provide a conceptual site model for input to basement retention and foundation design. The site was underlain by the Patonga Claystone formation, which tends to produce sliding failures on siltstone bands at low angles of repose.

EI Australia worked with the structural engineers for this project to design a retention system, which appropriately managed the risk associated with poor ground conditions in a cost-effective manner.

Value Added / Beneficial outcomes for Client:

Achieved.

Commercial Developmentx

SCOPE:
Commercial Development

CATEGORY:
Geotechnical Engineering

LOCATION:
Mascot, NSW

MIXED USE DEVELOPMENT

EI Australia assessed subsurface soil, rock and groundwater conditions at a current industrial site for redevelopment as a nine-storey commercial building over one to two levels of basement parking. Key geotechnical constraints for the site included the presence of deep soil associated with the Botany Basin sands and the proximity of the development to the Airport Link Rail Tunnel.

EI Australia’s involvement is to include detailed geotechnical investigation, finite element analysis and liaison with Sydney Trains to demonstrate that the proposed development would not impact the Sydney Central to Airport rail tunnel.

Value Added / Beneficial outcomes for Client:

Achieved.

Commercial Developmentx

SCOPE:
Commercial Development

CATEGORY:
Geotechnical Engineering

LOCATION:
Kensington, NSW

UNSW MECHANICAL ENGINEERING BUILDING

Geotechnical supervision of the demolition and construction of a new teaching and workshop facility for the Department of Mechanical and Manufacturing Engineering at the University of New South Wales. EI’s involvement included the review of structural designs for footings and shoring, the supervision of piling and on-site assessment of working platform design.

Specific project challenges included the presence of historical foundations, maintaining the stability of neighbouring structures and a stepped rock profile across the site.

Value Added / Beneficial outcomes for Client:

Achieved.

Residential Developmentx

SCOPE:
Commercial Development

CATEGORY:
Geotechnical Engineering

LOCATION:
Dee Why, NSW

SLOPE RISK ASSESSMENT

EI Australia carried out a geotechnical assessment and slope risk assessment for a residential development in Dee Why, NSW. The proposed development straddled a 4 m high waterfall associated with a historical drainage line.

The assessment included drilling of 5 boreholes, laboratory testing of collected soil samples and a semi-quantitative rock slope risk assessment according to Australian Geomechanics Society Guidelines.

The geotechnical assessment of the site was carried out under tight site access restrictions and with environmental controls in place to prevent the possibility of an environmental incident caused by drilling near a watercourse.

Value Added / Beneficial outcomes for Client:

Achieved.

Mixed-Use Developmentx

SCOPE:
Mixed-Use Development

CATEGORY:
Geotechnical Engineering

LOCATION:
Rockdale, NSW

IMPACT ASSESSMENT USING FINITE ELEMENT ANALYSIS

EI Australia initially carried out a geotechnical investigation for a mixed-use tower development in Rockdale, NSW. The proposed development involved the construction of two to six-level basement, which was to overly and be built around a major infrastructure tunnel which was to be protected during construction.

The investigation included drilling of cored boreholes, laboratory testing of collected soil and rock samples, and in-situ stress testing.

A Finite Element Analysis (FEA) using PLAXIS 3D, a three-dimensional FEA software, was completed to assess the potential movements and impact on the underground infrastructure by the proposed development. The results of the analysis helped assist the design of the basement excavation and its methodology, and allowed the development to progress past stringent council and infrastructure requirements.

Value Added / Beneficial outcomes for Client:

Achieved.