Assignment of condition indices for in-service high concrete dams

Abstract

1. The monitoring of a dam's condition is based on the creation of statistical and computational models, and the assignment, on this basis, of computed values characterizing the different states of the dam. Limiting computed MP values correspond to the boundary of the transition to an unserviceable state. The limiting allowable MP values define the prescribed reliability reserve required for the adoption of solutions. 2. The statistical model of a dam's behavior is determined using modern computer programs for analysis of time series, which make it possible to assess qualitatively the role of each of the effective factors (load, the extent to which the dam's monolithic character is disturbed, the condition of the contact zone) in measured parameters controlling the stress-strain state of the dam. 3. A computational model is created on the basis of statistical processing and is calibrated with respect to relationships derived from analysis of field data. 4. Numerical MP values, functional relationships, and parametric relationships reflecting the specifics of the performance of a specific entity enter into the system of limiting allowable values. 5. The system of limiting allowable MP values, which is used for on-going assessment of the condition of a dam, is one of the original elements of the declaration of safety of high concrete dams.