强荷载作用下随机分布非均匀颗粒材料的仿真  

A Simulation Method for Non-Uniformed Distribution of Granular Materials under Strong Loading

作　　者：李艺烁 付用全 白峰涛 LI Yishuo;FU Yongquan;BAI Fengtao(School of Engineering,Ocean University of China,Qingdao 266100,Shandong,China)

机构地区：[1]中国海洋大学工程学院,山东青岛266100

出　　处：《兵工学报》2023年第S01期125-131,共7页Acta Armamentarii

摘　　要：混凝土内的骨料排布、重力式沉箱码头内抛石的分布、杀爆弹的破片分布等都是不均匀的、随机的,在数值模拟过程中通常将其简化为均匀分布,这种简化会对模拟结果的准确性产生影响,但尚未定性分析。为此提出非均匀颗粒材料生成算法,并将其应用到混凝土骨料、沉箱码头抛石、杀爆弹碎片的生成中,以通过数值模拟研究其在高应变率下的失效破环。选取沉箱码头为研究对象,将填石沉箱码头的数值模拟结果与简化的填砂沉箱码头数值模拟结果进行对比,分析二者的荷载情况和损伤状况。研究结果表明,冲击波在填石码头的传播速度快于填砂码头的传播速度,并且填石沉箱码头破坏比填砂沉箱码头严重。The distribution of aggregate in concrete,the distribution of ripraps in gravity caisson wharf,and the fragment distribution of high explosive projectile are all uneven and random.The distribution is usually simplified to a uniform distribution in the process of numerical simulation,which affects the accuracy of the simulated results,but it has not been qualitatively analyzed.In this paper,a method of generating a riprap model of caisson wharf is provided,and a random stone riprap caisson wharf model based on math software is established.The force characteristics and failure modes of riprap caisson wharf are analyzed.In order to explore the damage characteristics of castaway caisson pier and sand-filled caisson pier under the underwater explosion load,a comparative study of the castaway model and the sand-filled model was carried out,and the damage results of the two models under the same conditions were summarized,which provides a reference for the damage assessment of such structures.The results show that the propagation speed of shock waves in the caisson wharf is faster than that in the sand-filled caisson wharf,and the damage of the caisson wharf is more serious than that of the sand-filled caisson wharf.

关 键 词：非均匀颗粒材料 沉箱码头 高应变率 强荷载 

分 类 号：O383.2[理学—流体力学] TU501[理学—力学]