A study on damage prediction of a concrete gravity dam under underwater non-contact explosive loads
LIU Xiaopeng1，CHEN Jianyun2，ZHOU Jing3，XU Qiang2
1. College of Water Conservancy and Civil Engineering, Shandong Agricultural University, Taian 271018, China;
2. Department of Architectural Engineering, Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian 116024, China;
3. Taishan Polytechnic, Taian 271000, China
Abstract：Dams are important water-retaining structures. Their safety directly affects the lives and properties of downstream people. Once a dam break occurs, the consequences will be disastrous. Based on the Euler and Lagrange fluid-solid coupling algorithm, underwater non-contact explosion damage of a concrete gravity dam is researched by using LSDYNA software in this paper. High strain rate effect of the concrete is considered. The relationship between underwater non-contact explosive loads and the damage degree of the dam is discussed, which is affected by initiation depths, initiation distances, water level in front of the dam, and explosive equivalent. The prediction curve of dam damage degree is fitted. The study shows that the detonation depth, detonation distance and the degree of water level in front of the dam are all important factors that affect the anti-blast performance of the dam. The damage location on the upstream surface moves to the bottom of the dam as the initiation depth increases. The greater the detonation depth, the more difficult to form penetrating damage. Closed explosions cause more serious damage to the dam. Low-water level explosions can effectively reduce the damage of the dam and improve the dam's anti-blast ability. When a war occurs, some measures should be taken to minimize the impact damage of the dam, such as emptying the reservoir water in advance, preventing the bomb from exploding in water, or preventing the bomb from approaching the dam. The research results can predict the damage degree of the dam subjected to the underwater non-contact explosive loads, providing a certain basis for the government's decision.
刘晓蓬1，陈健云2，周晶3，徐强2. 水下非接触爆炸荷载下某混凝土重力坝损伤预测研究[J]. 振动与冲击, 2022, 41(12): 108-116.
LIU Xiaopeng1，CHEN Jianyun2，ZHOU Jing3，XU Qiang2. A study on damage prediction of a concrete gravity dam under underwater non-contact explosive loads. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(12): 108-116.
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