Composite Cutoff Wall Construction

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Title: Composite Cutoff Wall Construction

Author(s): Tim Wehling, Joe Burke, and Robert N. Curry Jr.

Publication: Concrete International

Volume: 38

Issue: 2

Appears on pages(s): 31-36

Keywords: trenching, pumpability, slip form, placement

Date: 2/1/2016

Abstract:
The California Department of Water Resources manages the California State Water Project (SWP)––the largest state-built and operated water and power system in the United States. One of the existing SWP reservoirs, the Crafton Hills Reservoir, was enlarged by constructing a new dam in an adjacent valley. The quality of the upper portion of the foundation necessitated the use of a composite cutoff system comprising a grout curtain and concrete cutoff wall. The wall was placed in the upper 10 ft (3 m) of the foundation between the two grout rows. Low-slump concrete proved to be a feasible and cost-effective solution for the project.