Pressure Relief Wells

For excavations founded above a confined aquifer where there is an excess of pore water pressure, there can be a risk of basal heave. This risk can be mitigated by drilling passive relief wells down from within the excavation, through the confining layer (often stiff clay), to relieve pressure in the underlying permeable layer.

As excavation progresses, water naturally overflows from the well and is channelled into a sump within the excavation, where it is then pumped to surface.

Project Dewatering Limited can provide the necessary drilling expertise and materials required for a passive relief system.