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

在这一年中，利用铝棒进行了双轴实验，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空隙变化。本文提出了连接点阵元胞自动机（CL-CA）的局部规则，通过对现有重力流规则的修正，使我们能够分析颗粒组合的行为。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。针对溃坝问题，提出了基于新建立的颗粒特性局部规则的数值分析方法，探讨了预测盘体轨迹与CIP法计算盘体轨迹之间的关系。数值与实验结果吻合较好，验证了该规则的适用性。

During this year, a biaxial experiment using aluminum rods is performed and the video record is analyzed 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 behavior 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 for the behavior of granules is examined under the dam break problem between predicted loci of disks and those calculated by CIP method. Applicability of the proposed rule is verified through a good agreement within numerical and experimental results.