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为准确预测混凝土重力坝结构在爆炸荷载作用下的动力响应特征,确定其概率意义上合理的防爆距离,提出基于爆炸荷载统计模型的重力坝结构动力响应随机性分析方法。首先,在已有爆炸荷载公式、计算图表和相关试验统计数据的基础上,建立空中爆炸荷载统计模型。同时,构建国内某混凝土重力坝的非溢流坝段的炸药-空气-坝体-地基的有限元耦合模型。然后,在考虑爆炸荷载的不确定性情况下,运用动力学显式算法分析坝体结构的不确定性动力响应特征。最后,采用统计学分析方法研究坝体动响应量最值的概率分布特征及损伤状态随比例爆炸距离的变化。结果表明,结构爆炸动力峰值响应量大致服从正态分布,在重力坝结构的抗爆防护设计中应合理考虑爆炸荷载变异性的影响。
In order to accurately predict the dynamic response characteristics of concrete gravity dam under explosive load and determine its reasonable explosion-proof distance, a stochastic analysis method of dynamic response of gravity dam based on statistical model of explosion load is proposed. First of all, based on the existing blast load formula, calculation chart and related test statistics, the statistical model of air blast load is established. At the same time, a finite element coupled model of dynamite - air - body - foundation of a non - overflow dam section of a concrete gravity dam in China is constructed. Then, considering the uncertainty of the explosion load, the dynamic explicit algorithm is used to analyze the dynamic response characteristics of the dam structure. Finally, the statistical analysis method is used to study the probability distribution of dam response value and the change of damage state with proportional explosion distance. The results show that the peak response of structural explosive generally follows the normal distribution, and the influence of explosive load variability should be considered reasonably in the design of antiknock of gravity dam.