33-35 Angas Street, Adelaide
Project Type: Geotechnical Investigation: High-Rise Tower, Basement Level
Client: Private Developer
Overview:
TERRATECH was engaged to undertake a staged geotechnical investigation (desktop and intrusive) for a proposed twenty-storey mixed-use development at 33-35 Angas Street, Adelaide. The development includes a single-level basement and is located within the Adelaide CBD, on a site occupied by a two-storey commercial building and an adjoining warehouse.
The investigation was designed to characterise subsurface conditions, confirm groundwater levels, and provide geotechnical design parameters to inform foundation systems and basement retention. Works included a Stage 1 desktop review of two prior nearby investigations and a Stage 2 intrusive borehole to 25 metres, together with laboratory testing.
Key Challenges:
Drill rig access constrained by an occupied building overhead, requiring temporary removal of a section of roof
Variable historic fill, including waste inclusions and brick, associated with the site's former use
Highly reactive clay profile requiring careful basement and floor slab design
Deep basement excavation within a constrained inner-city site, adjacent to established structures
Groundwater expected within the founding depth, requiring drainage design for the retention system
Outcome
TERRATECH delivered confirmed geotechnical design parameters that directly informed the selection of CFA piles founded in the Hallett Cove Sandstone, together with a soldier pile wall and shotcrete retention system suitable for the basement excavation. The combined Stage 1 and Stage 2 findings provided a confirmed ground model and reduced uncertainty around fill conditions and groundwater behaviour.
The outcomes gave the client a clear path to detailed design, enabling the project team to progress foundation and basement retention planning for this technically constrained inner-city development.
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