Structural (concrete) diaphragm walls provide effective groundwater control and earth retention. They can also act as temporary or permanent load bearing support.

Technical Details

Highly saturated soils, high groundwater, unstable soils, and confined or restricted job sites are typical problems encountered on deep, urban excavation projects. Treating these problems individually by conventional methods can be prohibitively expensive and time consuming. Conventional approaches also often involve vibration-intensive techniques that may create unacceptable risks to adjacent structures. The concrete diaphragm wall construction method addresses all of these concerns in a single, safe operation.

In many cases, the technique eliminates the need to underpin adjacent structures. The virtually vibration-free operation minimizes the potential for ground movement and its resulting detrimental settlement.

Concrete diaphragm walls are most cost-effective when they can simultaneously function as a groundwater cut-off and temporary soil retention system during the excavation phase of the project, and then as permanent underground walls with load-carrying capabilities for the finished structure.