Abstract
This paper reports on the design considerations and the experience gained from the placement of 400 000 m 2 of geotextiles in temporary and permanent water-retaining embankments of the James Bay hydroelectric project in Northern Québec, Canada. Scarcity of suitable granular materials and ease of installation of fabrics favoured their use in the earth and rockfill structures. Their main function was to act as filters in temporary cofferdams between the coarse rockfills and the upstream cores made of cohesionless silty moraine. Performance tests indicated that, for placement under water over dumped rockfill, heavy-duty non-woven fabrics had to be specified to avoid punching by large angular stones. In rolled embankments constructed above water, geotextiles with masses greater than 300 g/m 2 worked satisfactorily because of the possibility of working out a better bedding surface at the interface.
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