Impact resistance assessment of debris dam using particle method

日本近期频繁遭遇集中暴雨袭击，多地发生泥石流。为了防止泥石流灾害的发生，在上游地区修建了各种各样的泥石流坝，但对其抗冲性能的研究还很少。因此，我们认为，本文提出了一种用三维质点法估算土石坝冲击特性和动强度的解析方法，得到了如下结果：1）所提出的方法（质点法）可以模拟混凝土构件在冲击/冲击荷载作用下的冲击行为。通过对混凝土板在刚性弹丸高速撞击下局部损伤的数值模拟，验证了质点法对复杂破坏行为的有效性。对钢框架土石坝在冲击荷载作用下的冲击行为进行了数值模拟，验证了所提方法的有效性。4）定义了钢框架土石坝的最可能破坏模式，并利用所提方法预测了其可能性。

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.