Impact resistance assessment of debris dam using particle method

近期，日本频繁遭遇集中暴雨，多地发生泥石流。为了防止泥石流灾害，在上游地区修建了不同类型的泥石流坝，但对其抗冲击性能研究较少。因此，本研究提出了一种三维颗粒法估算碎片坝冲击特性和动强度的分析方法。本研究得到以下结果：1)所提出的方法（粒子法）可以模拟混凝土构件在脉冲/冲击荷载作用下的冲击行为。2)通过模拟刚性弹丸高速碰撞下混凝土板的局部损伤，验证了粒子法对复杂破坏行为的有效性。3)对钢框架碎石坝在冲击荷载作用下的冲击特性进行了仿真，验证了所提方法的有效性。(4)定义了钢框架堆石坝最可能的破坏模式，并利用该方法对其发生破坏的可能性进行了预测。

Recently, Japan was frequently struck by concentrated heavy rain, thus debris flow occurred in many places. In order to prevent the disaster by debris flow, various debris dam had been constructed in the upriver distinct, but their impact resistance have not been studied. Therefore, this study presents an analytical approach for the estimation of impact behavior and dynamic strength of debris dam by 3-dimensional particle method.The following results are obtained from this study.1) The proposed method (Particle Method) could simulate the impact behavior of concrete member under impulsive/impact load.2) Effectiveness of Particle Method to complicated failure behavior is verified by simulating the local damage of concrete plate subjected to high velocity collision by rigid projectile.3) Impact behavior of steel frame debris dam subjected to the impact loading was simulated, and the validity of proposed method was confirmed.4) The most probable failure mode of steel frame debris dam is defined, and its possibility is predicted by proposed method.