Geotechnical Engineering Services in Melbourne

The western suburbs are underlain by basalt from the Newer Volcanics group. While often strong, these rocks can contain irregular weathering, cavities, and variable jointing. We recommend thorough site investigation including core drilling and geophysical surveys to identify potential issues like solution cavities or low-strength zones. Groundwater is generally deep but can be perched in basalt fractures. Our local experience helps us design appropriate foundation solutions, such as pad footings or piles, that account for these conditions.

The Yarra River corridor features Holocene alluvial deposits, including soft clays, silts, and sands, often with high groundwater. These conditions can lead to settlement issues, liquefaction potential during seismic events, and difficulties with excavation dewatering. We typically recommend deeper foundations like piles or ground improvement techniques such as stone columns. Our team has extensive experience with riverfront projects, ensuring designs account for these challenging soils while maintaining cost-effectiveness.

Geotechnical reports in Melbourne must comply with Australian Standards, primarily AS 1726 for site investigations, AS 2870 for residential slabs, and AS 5100 for bridges. The National Construction Code (NCC) also sets performance requirements. For specific tests, AS 1289 series governs methods for soil classification, compaction, and strength. Additionally, local councils may have supplementary guidelines. Our reports are prepared by experienced engineers and are fully code-compliant, facilitating smooth approvals.

For a medium-sized commercial project (e.g., a 3-5 storey building), a typical investigation takes 2-4 weeks from field work to final report. This includes 2-3 days of drilling and in-situ testing, followed by laboratory testing (1-2 weeks), and report preparation (1 week). Timelines can vary based on site access, weather, and the complexity of subsurface conditions. We work closely with clients to schedule investigations efficiently and provide preliminary findings as needed to support early design decisions.