When this service is useful
The right scope depends on your development, site access, ground conditions and the information needed by your project team. This service is commonly used for:
- New boundary, basement and landscaping retaining walls
- Walls supporting buildings, driveways or neighbouring property
- Existing walls showing movement, cracking or drainage concerns
- DA or CDC documentation requiring geotechnical input
Ground parameters for retaining-wall and excavation design
Retaining-wall design may depend on founding material, retained ground, wall height, surcharge loads, groundwater, drainage and proximity to boundaries or neighbouring structures. Geotechnical investigation is used to clarify relevant ground-related inputs for the structural designer rather than replace structural design.
Sydney projects may involve weathered sandstone, shale-derived clay, variable fill, coastal or alluvial soils and constrained access. The applicable ground parameters and investigation method must be selected from the project geometry and actual subsurface conditions.
Important project and ground considerations
- Founding depth, bearing conditions and variability across the wall alignment
- Retained material, earth-pressure assumptions and surcharge loads
- Groundwater, seepage, drainage and backfill considerations
- Excavation sequence, neighbouring assets and construction verification
What the assessment can include
- Review of wall concept, levels, loads and site constraints
- Investigation of founding and retained materials where required
- Assessment of groundwater and drainage conditions
- Selection of earth-pressure and foundation parameters for the structural designer
What you receive
- Ground model and relevant design parameters
- Founding, excavation and backfill recommendations
- Drainage, surcharge and construction-sequence considerations
- Inspection or verification requirements for construction
What to provide for your quotation
The clearest quote starts with enough information to understand your actual project, site constraints and required deliverables.
- Site address, survey and proposed retaining-wall alignment
- Wall height, retained levels, nearby structures and surcharge information
- Available structural concepts, drainage details and access photographs
- Any specific council, certifier, builder or designer request
Retaining Wall Geotechnical Investigations across Sydney and NSW
Retaining-wall investigations can support sites in Macarthur, Western and South West Sydney, the Hills District, the Blue Mountains, Northern Beaches, Eastern Suburbs and Wollongong/Illawarra. Ground conditions and approval requirements must always be considered site by site.