Grouting is a proven methodology for installing upgradient and downgradient barriers (grout curtains) in dam foundations and is employed where the rock formations in the dam foundation is pervious, such that the permeability of the rock formation would lead to later seepage problems. A grout curtain is used primarily as a means of limiting water flow through foundation materials beneath the dam embankment. Grout curtains are installed by the injection of cement-based grouts into the foundation materials under pressure. Similar to other methodologies for vertical barriers, extensive laboratory testing is performed to determine the correct design grout mix to achieve the desired permeabilities.
Geo-Con employs the use of a computerized system for measuring and monitoring performance in dam foundation grouting projects including recording of: grout flow, pressures, permeability (Lugeon Values), grout take and mix designs. With grouting projects Geo-Con performs real time monitoring and recording of all drilling and grouting parameters during installation of the grout curtain(s).