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Wave Dissipation Performance of Granular Media Based on Three-Dimensional Meso-Model

机译：基于三维中学模型的粒状介质的波浪耗散性能

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In this article, based on the real shape of gravel particles, a random polyhedron model is established, and a three-dimensional (3D) finite element (FE) analysis method is proposed to study the wave dissipation of broken gravel. In this article, the generation algorithm of 3D gravel with random size and shape is proposed, and the 3D meso-model of gravel particles is established. The numerical simulation of air explosion of explosive in free field is carried out by using LS-DYNA software, and the sensitivity of grid size was verified. Finally, it is concluded that the meshing calculation result of 0.01m element is more reliable. In order to verify the effectiveness of the analysis method, the numerical results are compared with the limited experimental data, and a good agreement is obtained, which shows that the 3D mesoscopic model and the numerical analysis method of gravel particle system can reliably predict the propagation of shock wave in gravel. Then, the wave dissipation performance of gravel layer under three working conditions of no water, partial water and all water is explored, and the dynamic response, energy analysis and meso-deformation of gravel particles are studied by numerical simulation. It is concluded that the gravel particle system significantly weakens the shock wave, and the peak pressure attenuates exponentially in the velocity direction, and the existence of water will affect the attenuation ability of the explosion wave.
机译：在本文中，基于砾石颗粒的真实形状，建立了一种随机多面体模型，提出了一种三维（3D）有限元（FE）分析方法来研究破碎砾石的波浪耗散。在本文中，提出了具有随机尺寸和形状的3D砾石的发电算法，建立了砾石颗粒的3D中间模型。通过使用LS-DYNA软件进行自由场中爆炸爆炸的数值模拟，验证了网格尺寸的敏感性。最后，得出结论，0.01M元素的啮合计算结果更可靠。为了验证分析方法的有效性，将数值结果与有限的实验数据进行比较，获得了良好的一致性，这表明砾石粒子系统的3D介观模型和数值分析方法可以可靠地预测传播在砾石中的冲击波。然后，探索了在没有水，部分水和所有水的三个工作条件下的砾石层的波浪耗散性能，并且通过数值模拟研究了砾石颗粒的动态响应，能量分析和砾石粒子的变形。结论是，砾石粒子系统显着削弱了冲击波，并且峰值压力衰减在速度方向上，水的存在会影响爆炸波的衰减能力。

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