Effects of reservoir-bottom explosion on concrete gravity dam and potential mitigation measure

IF 3.9 2区工程技术 Q1 ENGINEERING, CIVIL

Structures Pub Date : 2024-10-22 DOI:10.1016/j.istruc.2024.107514

Yong Fan , Guangdong Yang , Wenzhuo Li , Zhenyu Feng , Pengchang Sun , Bin Tian

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引用次数: 0

Abstract

As an essential infrastructure, dams may suffer explosive loads during their lifecycle. To reveal the dynamic response characteristics of concrete gravity dam (CGD) under reservoir-bottom explosions and explore potential mitigation measures, a 1:100 concrete gravity dam model was poured, and eight test scenarios under different explosion distances, water depths and detonation depths were designed. The time-history curves of water pressure, acceleration, and velocity under different test scenarios were recorded and compared to better understand the dynamic response of CGD under reservoir-bottom explosions. In addition, bubble curtains were used as a potential measure to mitigate the effects of underwater explosions on CGD. The results indicate that the maximum peak acceleration of the dam happens at the water's surface elevation. The smaller the explosion distance or the more profound the water depth, the more intense the response of the CGD. Compared with the reservoir-bottom explosion, the response of the CGD is stronger when the explosion is suspended in water. Arranging a bubble curtain on the upstream surface can significantly mitigate the reservoir-bottom explosion effects on the dam, and the peak accelerations are reduced by 92.0–99.5 %. This paper can provide important references for studying the dynamic response of CGD under reservoir-bottom explosions and corresponding mitigation measures.

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库底爆炸对混凝土重力坝的影响和可能的缓解措施

作为重要的基础设施，大坝在其生命周期内可能会承受爆炸荷载。为了揭示混凝土重力坝（CGD）在水库底部爆炸下的动态响应特征，并探索潜在的缓解措施，我们浇筑了 1:100 的混凝土重力坝模型，并设计了不同爆炸距离、水深和起爆深度下的八种试验方案。记录并比较了不同试验方案下的水压、加速度和速度的时间历史曲线，以更好地了解 CGD 在库底爆炸下的动态响应。此外，还使用了气泡帘作为减轻水下爆炸对 CGD 影响的潜在措施。结果表明，大坝的最大峰值加速度发生在水面高程处。爆炸距离越小或水深越深，CGD 的反应越强烈。与水库底部爆炸相比，当爆炸悬浮在水中时，CGD 的响应更强烈。在上游表面布置气泡帷幕可显著减轻库底爆炸对大坝的影响，峰值加速度可降低 92.0-99.5%。本文可为研究 CGD 在库底爆炸下的动力响应及相应的减缓措施提供重要参考。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Structures Engineering-Architecture

CiteScore

5.70

自引率

17.10%

发文量

1187

期刊介绍： Structures aims to publish internationally-leading research across the full breadth of structural engineering. Papers for Structures are particularly welcome in which high-quality research will benefit from wide readership of academics and practitioners such that not only high citation rates but also tangible industrial-related pathways to impact are achieved.