Investigation into the performance-based blast-resistance evaluation for concrete gravity dams
Investigation into the performance-based blast-resistance evaluation for concrete gravity dams
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DOI：
10.1016/j.engstruct.2022.114800
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发表时间：
2022-10
影响因子：
5.5
通讯作者：
Chao Wang;Min Du;Sherong Zhang;Pei-yong Wei;Xiaohua Wang;Wenlong Huo
中科院分区：
文献类型：
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作者：
Chao Wang;Min Du;Sherong Zhang;Pei-yong Wei;Xiaohua Wang;Wenlong Huo
近年来，大坝在极端爆炸条件下的抗爆问题越来越受到管理者和工程技术人员的关注。混凝土重力坝在爆炸荷载作用下的抗爆评价和安全控制标准仍然是一个有争议的问题。为此，建立了混凝土重力坝全耦合三维有限元模型，模拟了不同爆炸场景下混凝土重力坝的破坏模式。在此基础上，建立了基于性能的混凝土重力坝抗爆评价框架，以考虑大坝的整体安全，包括坝头和坝基的整体裂缝演化和稳定性。根据该评价框架，提出了基于爆破振动的坝头安全评价模型、修正的坝基抗滑稳定评价模型和具有保水性能的坝体整体损伤指数，探讨了大坝爆炸后的整体安全性。最后，作为算例，提出了大坝的安全控制准则，为大坝的进一步防护设计提供了理论支持。
In recent years, the blast-resistance of dams under extreme explosion conditions has received more and more concerns by managers and engineers. The blast-resistance evaluation and safety control criteria for concrete gravity dams subjected to explosion loads are still controversial problems. To this end, a fully coupled three-dimensional finite element model of a concrete gravity dam is established to simulate the damage modes of the dam under various explosion scenarios. Then, a performance-based blast-resistance evaluation framework of concrete gravity dams is established in this study to consider the global safety of the dam, including the global crack evolution and the stabilities of dam head and dam foundation. According to the evaluation framework, a blast-vibration-based model for dam head safety, a modified model against sliding for dam foundation stability, and a global damage index with water retaining performance are provided in this study to discuss the global safety of the dam experienced explosions. Finally, safety control criteria of the dam are also proposed as an example, which provide theoretical support for the further protection design of the dam.