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

Discussion: Casinader Ranji (See full record)
Discussion: Cao Keming (See full record)
Discussion: Materon Bayardo (See full record)
Discussion: Moreno Edmundo (See full record)
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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: Rivers and streams | Concrete | Rockfill dams | Rock fills | Earthfill dams | Particles | Permeability (soil) | Soil analysis

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