Abstract
As part of the La Grande complex, in northern Québec, the development of the LG-1 hydroelectric project required the construction of a 2444 m long dyke on the north shore. The presence of a wide sensitive marine clay terrace covered with deltaic and river sand and silt deposits called for several design features, including the construction of a cement-bentonite cutoff through the sand and silt deposits on the terrace. This paper describes the different construction phases of the cement-bentonite cutoff with emphasis on excavation procedure and quality control.Key words: bentonite, cement, construction, cutoff, excavation, slurry trench.
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