Rehabilitation of Blackfoot Dam In-Situ Testing and Analysis

by Michael P. Stuhr, 5th Combat Engineer Battalion, Fort, Leonard Wood, MO, USA,
Grady W. Williams, 6th Combat Engineer Battalion, Fort, Leonard Wood, MO, USA,

Document Type: Proceeding Paper

Part of: Use of In Situ Tests in Geotechnical Engineering


The dam was constructed in 1909 and was recently found to require rehabilitation to enlarge the spillway and improve embankment stability against the large earthquake potential in the area. To overcome access problems, cone penetration testing was used in combination with minimal conventional explorations and lab analyses. Sonar and radar surveys were used to help define the geometry of the dam. This exploration program provided the necessary data required to perform a dynamic analysis and redesign of the embankment. Using in-situ methods, combined with minimal lab testing, redundancy, and comparisons with published data achieved a reliable and economical design on schedule.

Subject Headings: Field tests | Penetration tests | Laboratory tests | Rehabilitation | Dams | Dynamic analysis | Soil surveys | Earthfill dams | Idaho | United States

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