本文结合DIC方法对砂土体系进行可视化的直剪试验。通过对所采集的数字图片进行预处理,得到利于计算砂土体系细观参数的优质图片,经过图像分割和区域标记,最后利用MATLAB计算得到体系孔隙率、定向率和各向异性率等细观参数。对图像进行DIC计算分析,得到砂土颗粒体系的位移等值线云图,分析了体系内的砂土颗粒在直剪试验中的运动情况,并定性描述了位移突变对体系部分力链传递过程的影响。 In this paper, DIC method is used to visualize the direct shear test of sand system. Through the pretreatment of the collected digital pictures, we get the good picture that is helpful to calculate the meso-parameters of the sand system. After image segmentation and area marking, we get the mesoscopies such as porosity, orientation and anisotropy parameter. DIC was used to calculate and analyze the image. The displacement contour map of the sand particle system was obtained. The movement of the sand particles in the system was analyzed in the direct shear test. The displacement of the system was also described qualitatively. influences.