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    Time for action on Australian expansive clays: design lessons for ground engineers

    December 8, 2025|

    Reviewed by Tom Sullivan

    Time for action on Australian expansive clays: design lessons for ground engineers

    First reported on Roads & Infrastructure (AU)

    30 Second Briefing

    New research on Australian expansive clays warns that more frequent intense rainfall and drought cycles are accelerating differential movement and cracking in lightweight buildings, pavements and transport corridors founded on shrink–swell soils. The work points to heave and settlement driven by deep moisture fluctuations, with particular concern for lightly loaded slabs, shallow footings and low-volume roads where historical climate data underestimates design suction changes. Engineers are urged to revisit site classification, footing depth, drainage and moisture barriers, and to integrate updated climate projections into geotechnical design for new and existing assets.

    Technical Brief

    • Safety emphasis is on preventing structural distress that can compromise egress routes and serviceability of community infrastructure.

    Our Take

    Within the 10 Geotechnical stories in our coverage, Australia appears frequently in pieces tagged Safety and Sustainability, signalling that regulators and asset owners there are increasingly tying geotechnical performance to broader ESG and resilience objectives.

    Because this article sits under Research rather than a specific project, it is likely to feed into guidance or standards that Roads & Infrastructure Magazine’s Australian audience can apply across multiple road and civil assets, rather than being confined to a single site case study.

    Across the 200 tag-matched pieces, Safety-focused geotechnical items from Australia often highlight lessons from near-misses and monitoring data, suggesting practitioners are moving from compliance-only approaches towards more data-driven risk management in design and maintenance.

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    Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.

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