Impact resistance assessment of debris dam using particle method

近日，日本频频遭遇集中暴雨，多地出现泥石流。为了防止泥石流灾害，上游各具特色地修建了各种泥石坝，但对泥石坝的抗冲击性能还没有进行研究。因此，本研究提出了一种用三维质点方法估算土石坝冲击行为和动强度的解析方法。研究结果如下：1)该方法(质点方法)可以模拟混凝土构件在冲击/冲击荷载作用下的冲击行为；2)通过模拟刚性弹丸高速碰撞混凝土板的局部损伤，验证了质点方法对复杂破坏行为的有效性。3)模拟了钢框架土石坝在冲击荷载作用下的冲击行为，验证了该方法的有效性。4)定义了钢框架土石坝最可能的破坏模式，并用所提出的方法对其可能性进行了预测。

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.