ABSTRACT
As illustrated in Chapter 2, grout curtains have been used in the United States to control seepage in rock masses under and around dams of all types since the 1890s. For a variety of understandable, if not always laudable, reasons, the long-term performance of many of these curtains has not been satisfactory, especially in lithologies containing soluble and/or erodible materials. Foundation remediation in such instances traditionally involved regrouting, often, of course, using the same means, methods, and materials whose defects contributed to the inadequacy in the rst place.
