Abstract
Abstract This paper presents a proposed model for monitoring the stress on a super-high arch dam during construction. Using mathematics, mechanics, and dam engineering principles, the mathematical expressions of the self-weight component of the dam prior to and following the sealing of the bottom of the arch were derived. The visco-elastoplastic constitutive model of dam concrete during construction was identified and used to develop a stress monitoring model for a super-high arch dam. Based on in-situ stress monitoring data collected during the construction of a super-high arch dam, the stress monitoring model was applied to a super-high arch dam accounting for future impoundment, and the key components of the monitoring model were isolated. The results show that the model has high fitting accuracy and incorporates an appropriate selection of factors affecting dam stress. The hydrograph of each component conforms to the structural characteristics of super-high arch dams during construction. This model overcomes the limitations of applying the complete self-weight of the dam body on the cantilever beam and was validated using data from a super-high arch dam construction project. Thus, this paper provides evidence for a safety monitoring model for super-high arch dams during construction.
Highlights
With the increasing number of super-high arch dams being constructed, safety has become a major focus in dam engineering research (Zhu )
Mechanics, and dam engineering principles and methods, a stress monitoring model for a super-high arch dam in the pre-impoundment stage of construction was developed based on the analysis of prototype observation data
The main contributions of this study are summarized as follows: (1) The mathematical expressions of the self-weight component both prior to and following the sealing of the bottom of the arch were derived considering the characteristics of a super-high arch dam in the preimpoundment phase of construction and the effect of arch seal grouting on self-weight stress
Summary
With the increasing number of super-high arch dams being constructed, safety has become a major focus in dam engineering research (Zhu ). Zhou et al ( ) predicted the long-term working behavior of dam structure using finite element analysis by separating the self-weight components, which improved the accuracy of the model These studies have presented in-depth investigations of the stress distribution laws and monitoring models of super-high arch dams and have demonstrated some important results. To determine the stress distribution characteristics of the upper portion of the dam after sealing the bottom of the arch, the influence of self-weight, temperature load, water level, and creep effect on the stress of the dam are analyzed in the proposed model. A mechanical constitutive model for dam concrete was constructed according to the creep characteristics of dam concrete and the loading and unloading curves of concrete specimens under different stress levels From this model, the corresponding constitutive equation was established and the expression of the stress–aging component was determined. The Nishihara model was adopted as a constitutive model of dam concrete,
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