Santeetlah Dam, a concrete gravity and arch structure, has experienced seepage andcracking problems due to alkali-aggregate reactivity (AAR). First ever growth expansionslots were cut in both the left and right sides of the dam during 1947-1950 to relievetemperature and AAR-induced forces. In order to evaluate overall dam safety prior to reestablishingthe existing slot on the left side of the dam, the dam was heavily instrumentedduring 1996-1998. The new instrumentation was automated to facilitate data retrieval aswell as provide real-time monitoring during the slot cut. This paper presents a briefinstrumentation history of the dam, and an overview of the engineering andinstrumentation effort required to support the slot cut while the dam was under load.
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