| 张宇*,张雪,王舒*,王铭明.盐浸-冻融-紫外线三因素影响下寒区混凝土坝强震损伤研究[J].实验力学,2024,39(4):454~462 |
| 盐浸-冻融-紫外线三因素影响下寒区混凝土坝强震损伤研究 |
| Study on strong earthquake damage of concrete dam in cold region affected by salt immersion, freeze-thaw and ultraviolet radiation |
| 投稿时间：2023-05-19 修订日期：2023-07-28 |
| DOI：10.7520/1001-4888-23-099 |
| 中文关键词: 混凝土坝 寒区 盐浸 冻融循环 紫外线 抗震性能 |
| 英文关键词:concrete dam cold regions salt immersion freeze-thaw cycle ultraviolet rays seismic performance |
| 基金项目:国家自然科学基金项目(52269026) |
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| 摘要点击次数: 2049 |
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| 中文摘要: |
| 为研究盐浸、冻融循环和紫外线辐照耦合作用对寒区混凝土坝的强震损伤影响，进行了三因素循环作用下的混凝土性能劣化试验和高坝抗震性能分析。根据盐浸分析结果配制高浓度盐浸液体，并根据实际情况确定冻融循环次数和紫外线辐射量，揭示盐浸-冻融-紫外线三因素与混凝土材料性能劣化之间的关联性规律；以此为基础，数值分析三因素对坝体强震破坏的影响。结果表明：恶劣环境下，混凝土材料在物理结晶膨胀破坏和化学侵蚀的相互作用下，材料性能劣化不断加深；发生强震时，盐浸-冻融-紫外线三因素改变了高坝的失效模式，降低了高坝的整体抗震性能。上述研究结果有助于深入了解恶劣环境对坝体材料力学性能的影响，并可为寒区水工结构抗震设计提供依据。 |
| 英文摘要: |
| In order to study the influence of salt immersion, freeze-thaw cycles and ultraviolet radiation coupling on the strong earthquake damage of concrete dams in cold regions, concrete performance degradation tests and seismic performance analysis of high dams under three factor cycles were carried out. Based on the results of the salt immersion analysis, a high concentration salt immersion liquid was prepared. In order to obtain the law of salt immersion freeze-thaw ultraviolet cycle effect and concrete material performance degradation, the number of freeze-thaw cycles and ultraviolet radiation amount were determined according to the actual situation. Based on the previous study, numerical analysis was conducted based on three influencing factors on the strong earthquake damage of the dam body. The results indicate that under harsh environments, the deterioration of material properties reinforce continuously due to the interaction between physical crystallization expansion and chemical erosion of concrete materials. When a strong earthquake occurs, the cyclic action of salt immersion freeze-thaw ultraviolet radiation changes the failure mode of high dams, reducing their overall seismic performance. The above research results contribute to a deep understanding of the impact of adverse environmental factors on the mechanical properties of dam materials, and provide a criteria for seismic design of hydraulic structures in cold regions. |
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