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The Upstream Zone in Concrete-Face Rockfill Dams

by James L. Sherard,



Document Type: Proceeding Paper

Part of: Concrete Face Rockfill Dams?Design, Construction, and Performance

Abstract:

The upstream zone of small rock, the supporting zone for the slab at many recent concrete-face rockfill dams has contained less than 20% of particles smaller than the No. 4 sieve. Such materials cannot be placed practically without substantial segregation of the coarser particles, causing the zone to have relatively high permeability. On a few recently designed CFRDs the specifications have required a higher content of fines in this upstream zone, the main purpose being to provide an upstream zone which is free of significant segregation and has reliably low permeability.

Subject Headings: Rockfill dams | Rock fills | Rivers and streams | Permeability (soil) | Granular materials | Permeability (material) | Embankment dams

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