Abstract
The debonding failure of a polymer-based coating seriously affects the safe operation of buildings under the action of a high-velocity flood discharge flow. In order to achieve a healthy and sustainable operation of hydropower stations, the debonding failure between polyurea coating and concrete was described by the cohesive zone model, and a debonding failure model was proposed and verified. The results obtained from the model were basically consistent with the test results. Accordingly, the influence of the performance of different anchoring types, the material mechanics of polyurea-based coating and the bonding on debonding behavior were analyzed, and engineering application research was also carried out. The impact resistances of polyurea-based coating under different anchoring conditions are obtained, which provide a reference for the anti-shock and wear-resistant design of flood discharge infrastructure. The elastic modulus and Poisson’s ratio of the polyurea-based material have a significant influence on the impact resistance of polyurea-based coatings. When the elastic modulus and Poisson’s ratio of a polyurea-based material are 25 MPa and 0.45, respectively, the impact resistance is optimal. The greater the fracture energy of the bonding material, the better the impact resistance. The engineering application results show that the seepage prevention and anti-wear characteristics of flood discharge infrastructure all meet the engineering requirements.
Highlights
Scouring and cavitation damage are among the common problems for water conservation, especially for the high-velocity flow condition, which seriously affects the safe operation and efficiency of hydraulic structures
Flood discharge infrastructure receives erosion and wear under the action of a high-velocity water flow, on account of the complicated turbulent flow of flood discharge, but the water flow will produce a fluctuating pressure and cavitation on the building surface, which have an important effect on the erosion and wear of flood discharge infrastructure
The water flow acts on the flood discharge infrastructure, causing serious erosion when the polyurea coating is peeled off under the action of a high-velocity water flow
Summary
Scouring and cavitation damage are among the common problems for water conservation, especially for the high-velocity flow condition, which seriously affects the safe operation and efficiency of hydraulic structures It is necessary for the application of concrete, with an outstanding impact and wear resistance on flood discharge infrastructure, and measures for resistance to impact and wear should be adopted [1,2]. It is very important to study the mechanical behavior of the debonding failure between polyurea coatings and flood discharge infrastructure under the action of a high-velocity water flow and provide theoretical guidance for the design of anti-shock and wear protection in flood discharge infrastructure.
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