摘要
水坝是重要的挡水建筑物,其安全与否直接影响到下游人民的生命财产,溃坝产生的后果不堪设想。基于Euler与Lagrange流固耦合算法,并考虑爆炸荷载下混凝土的高应变率效应,运用LS-DYNA软件模拟分析了某混凝土重力坝的水下非接触爆炸损伤情况。探讨了受起爆深度、起爆距离和坝前水位与炸药当量影响时,水下非接触爆炸荷载与坝体损伤程度之间的关系,并拟合得到了该坝体的损伤等级预测曲线。通过该研究得到:起爆深度、起爆距离和坝前水位都是坝体抗爆性能的重要影响因素;上游面损伤位置随起爆深度增加而向坝体底部相应移动,起爆深度越大越不易形成贯穿性损伤,近距离起爆对坝体的损伤更为严重,低水位爆炸能够有效减小坝体损伤以提高坝体的抗爆能力。战争发生时可以采取提前放空库水、防止炸弹入水爆炸和防止炸弹接近坝体等方式使坝体的爆炸冲击损伤降到最低。研究成果能够预测坝体遭受水下非接触爆炸荷载时的损伤程度,为政府决策提供一定依据。
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 was studied by using the LSDYNA software in this paper.High strain rate effect of the concrete was considered.The relationship between underwater non-contact explosive loads and the damage degree of the dam was 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 was fit.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 results can predict the damage degree of the dam subjected to underwater non-contact explosive loads,providing a certain basis for the government’s decision.
作者
刘晓蓬
陈健云
周晶
徐强
LIU Xiaopeng;CHEN Jianyun;ZHOU Jing;XU Qiang(College of Water Conservancy and Civil Engineering,Shandong Agricultural University,Taian 271018,China;Department of Architectural Engineering,Faculty of Infrastructure Engineering,Dalian University of Technology,Dalian 116024,China;Taishan Polytechnic,Taian 271000,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2022年第12期108-116,共9页
Journal of Vibration and Shock
基金
国家自然科学基金(51679030)
“十三五”国家重点研发专项(2017YFC0404900)。
关键词
非接触爆炸荷载
混凝土重力坝
损伤预测
流固耦合
non-contact explosive loads
concrete gravity dam
damage prediction
fluid-solid coupling
