ICOLD Bulletin 150, Cutoffs for Dams, discusses foundation
treatment methods using cutoff-type barriers. High emphasis is
given to alluvial deposits throughout this document; however,
different materials may require cutoff. The construction of cutoffs
has made significant advances mainly through the development of
more powerful machinery for drilling and excavation, but also
through the introduction of new concepts and techniques, such as
jet grouting and deep soil mixing. The following types of cutoffs
are presented in this Bulletin: - Diaphragm walls - Vib walls -
Pile walls - Superimposed concreted galleries - Jet grouting - Deep
mixing These methods are described, and the practical application
of each method is illustrated by selected case histories. These
case histories also demonstrate how certain difficulties specific
to a particular dam site have been dealt with. The performance of
cutoffs should be monitored so that their efficiency in reducing
flow and piezometric head can be evaluated. Piezometers installed
in the foundation upstream and downstream of the cutoff are needed
to meet this objective.
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