A better understanding on failure characteristics of the concrete gravity dam, when subjected to underwater blast load, is significant and crucial for the operation evaluation and protection of dams. In this paper, a peridynamic modeling and numerical analysis for the underwater explosion failure of the concrete gravity dam is presented. The meso-structural characteristics of concrete are taken into account through a modified intermediately homogenized peridynamic (IH-PD) model, where the mechanical behavior of wet concrete is considered as well. The blast-induced failure of concrete is investigated through two benchmark examples, and the validation is established by comparing the available numerical results with corresponding experimental observations. Furthermore, the explosion response and failure mode of the concrete gravity dam subjected to underwater blast load are numerically simulated, and the effects of explosion equivalent, standoff distance, and detonation depth on the gravity dam are analyzed and discussed respectively. The results could be meaningful in the evaluation of safe operation and protection design for the concrete gravity dam

翻译：在遭受水下爆炸负荷时,更好地了解混凝土重力大坝的故障特性,对于评估和保护大坝的作业十分重要,而且对于评估和保护大坝至关重要。本文介绍了对混凝土重力大坝水下爆炸失灵的潜伏动力建模和数值分析。混凝土的中间结构特征通过经修改的中间均匀的远重力模型(IH-PD)加以考虑,该模型也考虑湿混凝土的机械行为。通过两个基准示例对混凝土的爆炸引起的故障进行调查,并通过将现有数字结果与相应的实验观测进行比较来确定验证。此外,对受水下爆炸重力大坝的混凝土重力大坝的爆炸反应和故障模式进行了数字模拟,分别对爆炸等效、相隔距离和爆炸深度对重力大坝的影响进行了分析和讨论。这些结果对于评估混凝土重力大坝的安全操作和保护设计可能具有实际意义。