Diaphragm walls are walls built in the underground starting from the surface. They are performed by digging a trench, filling it withbentonite mud, placing a reinforcement, and then displacing the slurry by means of the subsequent concrete casting.
The wall can be used as excavation support, foundation element or as containment structure for the flow of underground water. Diaphragm walls are an important part of the underground construction works also because they can be built with a disruption degree that is relatively little.