Abstract
Rock engineering has played an important role in the design and construction management of the La Grande Complex, a 13,75O MW hydroelectric development in the James Bay area of northern Quebec. Confidence in the strength and erosion resisting properties of the precambrian granitic and metamorphic rocks of the region has led to some innovative design solutions as well as a policy of flexible response to rock support requirements. Experience gained with unlined tunnels and channels for hydraulic purposes is discussed. The importance of closely controlled drilling and blasting procedures in some areas of the work such as the crane support ledges at LG2 and a diversion conduit excavation at LG4 is also noted. The success of the flexible, generally optimistic approach to rock excavation and support activities in the Complex is due in large measure to the good communication links existing among design, cost control and construction elements within the management group, the Sociėtė d'ėnergie de la Baie James.
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