Abstract
Theodore Roosevelt Dam, on the Salt River northeast of Phoenix, Arizona, was originally constructed as an 85.3m-high arched masonry dam between 1903 and 1911. Modifications were completed in 1996, which included raising the dam 23.5 m for dam safety puroses and additional water supply. The dam is founded on Precambrian sandstone, siltstone, and dolomite. Occasional clay partings parallel the bedding, which dips upstream at 25 to 30 degrees. The studies performed for raising the dam considered deformation, stability, and seepage characteristics of the foundation rock mass to ensure it could safely withstand the additional loading. Seismic tomography and in situ jacking tests were used to characterize the deformation properties. Piezometers were installed to measure foundation water perssures before and after drainage measures. Critical clay partings and joints were sampled and tested for shear strength, and foundation blocks with the potential to move under loads applied by the dam and reservoir were analyzed three dimensionally for potential sliding under normal, flood, and time-varying earthquake conditions. Foundation treatment was performed based on the results of the studies.
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