Experimental and numerical approach for the behavior of granular medium within shear band

在这一年中，利用铝棒进行了活板门实验，并通过图像处理系统对视频记录进行了分析，得到了颗粒介质的位移轮廓和孔隙变化情况。通过对现有重力流规则的修正，提出了一种新的连接点阵元胞自动机局部规则，使我们能够分析颗粒组合的抬升问题。在实验中，用相同半径的铝棒和不同半径的铝棒来比较圆盘的不同行为，并通过10秒的高速视频来监控这些行为。基于新建立的局部规则的数值分析结果与实验结果吻合较好。描述了一种捕捉粒子间接触力分布的新概念。

During this year, trap-door experiment using aluminum rods is performed and the video record is analysed through the image processing system to obtain the displacement profile and the change of voids of granular media. New local rule of CL-CA (Connected-Lattice Cellular Automata is developed to enable us to analyze the uplift problem of granular assemblage by revising the existing rule for gravitational flow. In the experiment, aluminum rods with the same radius and those with different radii are used to compare the different behavior of circular disks and these behavior is monitored by the high-speed video during 10 seconds.Numerical analysis based on newly developed local rule is verified through a good agreement within numerical and experimental results. A new notion to capture the distribution of the contact force between particles is also described.