Wanapum Dam Embankment Settlement Study

by M. Gene Yow, (M.ASCE), Frederic R. Harris, Inc, Englewood, United States,
Thomas R. Hollingsworth, (M.ASCE), Frederic R. Harris, Inc, Englewood, United States,
David D. Moore, (M.ASCE), Frederic R. Harris, Inc, Englewood, United States,

Document Type: Proceeding Paper

Part of: Vertical and Horizontal Deformations of Foundations and Embankments


This paper discusses the long term vertical movements of a zoned earth embankment. Vertical movement of the Wanapum Dam embankment has been monitored since its completion in 1964. The settlement neared 0.3 m in 1990 and a study was conducted to evaluate the cause and select an appropriate response. It was concluded that the vertical movement is due to settlement of dumped rockfill sections and fill placed underwater. The magnitude of the settlement was found to be within the range of settlements measured at similar projects. No remedial work was considered necessary, but additional survey monuments were installed.

Subject Headings: Soil settlement | Soil structures | Soil analysis | Soil-structure interaction | Soil surveys | Vertical loads | Embankment dams | Rock fills

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