Slurry walls are constructed using a cement-bentonite slurry to produce a below ground low permeability barrier.
Rock grouting is normally done in fissured rock to reduce the flow of water along the joints and discontinuities in the rock.
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Whether natural or man-made soils sometimes present voids that may create sinkholes. Depending on the situation, and the quality of the soils, various techniques can be adapted to provide a permanent solution.