Cement-bentonite sheet pile CUT-OFF WALL

water retention

A cement-bentonite wall is a cast-in-situ water retaining screen, made up of a purpose-designed low-permeability material such as a cement-bentonite mixture. Driving sections such as sheet piles can be installed within the cut-off wall to reinforce the latter and assure structural stability. Construction sequence 1. In advance construction of temporary guide walls and excavation of a trench. Filling of the trench with a cement-bentonite slurry 2. Excavation of the second panel 3. Removal of the soil located between the two previously excavated panels 4. By repeating the procedure, the formation of the cut-off wall progresses. Technical specifications • Standard waterproof depths up to 35 m, occasionally seal depths up to 50 m • Non-structural barrier: a cut-off wall has no soil retaining function so the soil itself must properly provide strength and stability. • The water tightness / permeability and the compressive strength characteristics of the wall shall be determined by the composition of the cement-bentonite mixture, by reference to use and application. • Possible execution with a high-density polyethylene (HDPE) plastic membrane • Eventually reinforced with steel sheet piles to guarantee structural stability.