Depending on excavation depth, geometry, and soil conditions, VSL applies a range of retaining and foundation systems adapted to each project. Diaphragm walls, constructed with verticality-controlled grabs or trench cutters, can reach depths of up to 120 m. Circular or multi-cell shafts provide self-supporting solutions that minimize or eliminate internal strutting. Cutter Soil Mixing (CSM) is used for temporary, non-load-bearing support, while barrettes and secant piles address restricted sites or complex geometries.

Ground improvement techniques enhance bearing capacity, control settlements, and improve overall soil performance. VSL selects and combines methods according to soil type, load requirements, and construction constraints, enabling safe and efficient construction on difficult or reclaimed ground.

Cut-off systems create impermeable barriers to control groundwater and protect excavations, foundations, and underground structures. VSL designs and installs cut-off solutions that ensure watertight performance, durability, and compatibility with surrounding works.

Temporary or permanent retaining structures stabilize excavations and slopes in dense urban or complex geotechnical environments. VSL solutions are engineered to control ground movements and ensure safety throughout construction and service life.