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RETAINING WALL DESIGN
GT Geotechnical provides retaining wall design for residential, commercial and civil projects. Our designs combine site specific geotechnical data with practical engineering, so every wall is safe, durable, buildable and cost effective. We design to AS 4678 Earth Retaining Structures and relevant building material codes and consider soil conditions, groundwater, surcharge loads, global stability and drainage to deliver walls that perform long term.
Concrete Sleeper Retaining Walls
Concrete sleeper walls with steel posts are one of the popular solutions for residential and light commercial sites. We design post sizes, embedment depths, footing dimensions and drainage details based on soil conditions at your site. That avoids the risks of generic or "off the shelf design" that may not suit the ground conditions.
Composite Sleeper Retaining Walls
Composite sleeper systems offer a durable, low maintenance alternative to timber and concrete. We design composite sleeper walls to suit manufacturer specifications and site specific loading, giving clients, long lasting retaining wall solutions.
Boulder Retaining Walls
Boulder walls offer a natural, landscaped appearance and are well suited to rural, hinterland and sloping sites. We design boulder walls with appropriate rock sizing, placement geometry, batter angles and drainage. Our designs also account for foundation conditions to provide stability, particularly on steep or variable terrain.
Segmental Block Retaining Walls
Segmental block walls, including geogrid-reinforced systems, can retain significant heights while giving a clean architectural finish. We design block wall geometry, reinforcement lengths and spacing, drainage and foundation requirements to suit the selected block system and site conditions.
Reinforced Concrete Retaining Walls
For higher walls, heavier surcharge loads or constrained sites, reinforced concrete walls provide a robust, high-capacity solution. Working with structural engineers and builders, we provide the geotechnical design parameters needed for cantilever walls, basement walls and other reinforced concrete structures. These include bearing capacity, earth pressures, sliding and overturning resistance.
Piled & Contiguous Retaining Walls
Where excavations are deep, space is limited or adjacent structures must be protected, we design piled retaining solutions, including contiguous pile walls. These systems provide excavation support with minimal ground movement and suit infrastructure, school, commercial and basement projects.
Existing Retaining Wall Assessments
We assess the condition, stability and drainage of existing retaining walls showing signs of distress, such as leaning, cracking, bulging or water seepage. Our assessments identify the cause and give practical rectification options, from drainage improvements to strengthening or replacement.
Site Investigations, Certifications and Inspections
Every GT Geotechnical retaining wall design is backed by site-specific geotechnical investigation and certified by a Registered Professional Engineer of Queensland (RPEQ). That makes our designs suitable for council and private certifier approval. We can also complete construction-phase inspections, including footing and pier hole inspections, to confirm that ground conditions match the design and the wall is built as intended.