FSG provides specialist geotechnical engineering services for deep excavations and retention systems in complex ground and groundwater conditions.
Our team combines advanced geotechnical analysis, soil–structure interaction modelling and practical construction experience to deliver safe, efficient and buildable solutions for infrastructure, building, resources and industrial projects. We work closely with clients, designers and contractors to optimise excavation strategies, manage geotechnical risk and support successful project delivery from planning and procurement through to construction and final verification.
Our expertise spans deep basements, transport & resources infrastructure, utility corridors, industrial developments and constrained urban sites where excavation support and asset protection are critical. By considering ground conditions, groundwater behaviour, construction sequencing and interactions with adjacent infrastructure, we develop practical solutions that balance technical performance, constructability, programme requirements and commercial objectives. The result is retention and excavation support systems that provide confidence during design, construction and long-term operation.
Retention system design and constructability.
FSG provides specialist design services for temporary and permanent retention systems tailored to the specific geotechnical conditions, excavation requirements and project constraints of each site. Our capabilities include anchored and propped retaining walls, sheet pile walls, contiguous and secant piled walls, diaphragm walls, embedded retaining structures, soil-nailed and rock-bolted systems, ground anchors and other excavation support solutions.
We combine advanced geotechnical analysis with extensive construction experience to optimise both design and construction outcomes. By carefully evaluating soil–structure interaction, groundwater conditions, excavation staging, construction methodology and impacts on adjacent assets, we help clients select the most appropriate retention solution for their project. This practical, construction-focused approach delivers retention systems that are safe, efficient, buildable and capable of performing reliably throughout construction stages and service life.
Dewatering & Groundwater Management for Deep Excavations.
Effective groundwater management is critical to the successful delivery of deep excavations. FSG provides integrated hydrogeological and geotechnical services to understand groundwater conditions, evaluate excavation impacts and develop dewatering solutions that support safe, efficient construction.
Our capabilities include groundwater investigations, hydrogeological assessments, groundwater flow modelling, dewatering system design, recharge and infiltration systems, and groundwater input to permanent drainage and subsoil drainage designs. We work closely with project teams to understand the interaction between groundwater, excavation stability and adjacent assets, ensuring groundwater pressures and flow regimes are appropriately managed throughout construction.
By combining technical analysis with practical construction experience, we develop groundwater management strategies that facilitate excavation below the water table, minimise impacts on surrounding infrastructure and property, and meet environmental and regulatory requirements. The result is dewatering solutions that improve construction confidence, reduce risk and support efficient project delivery in challenging conditions.
What we do