Morris Sheppard Dam: A Rational Approach to Stability Analysisby John A. Focht, Jr., Fugro-McClelland, Inc, United States,
Robert P. Ringholz, Fugro-McClelland, Inc, United States,
Abstract: This paper details the excessive foundation piezometric conditions found during a routine five-year inspection, and presents the results of backfigured stability analysis of a critical buttress. It then summarizes the multiple sets of design stability criteria established by the design team to be achieved by the corrective measures. This rational approach using the Terzaghi observational method in conjunction with detailed analyses is believed to have provided a better balance of risk and certainty than is normally achievable with new construction. Analyses of corrective measures undertaken are presented to show that adequate stability of this 50-year old dam can be accomplished by grouting, development of good foundation drainage, and placement of substantial ballast within the dam.
Subject Headings: Dam foundations | Earthfill dams | Distinguished engineers | Risk management | Grouting | Drainage
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