Grout curtains are barriers that protect a dam from seepage and can be used in initial construction or repair.[1] Additionally, they can be used to strengthen foundations and contain spills.
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A grout curtain usually consists of a row of vertically drilled holes filled with pressurized grout, a process commonly known as pressure grouting.[2] The the holes are drilled in intervals and in such a way that they cross each other, creating a curtain.
Grout is injected with grouting jets, which use a high-pressure fluid stream (i.e., slurry or water) to erode a cavity in the soil.[1]