中文摘要：

利用数码可视化跟踪技术和数字信息计算机实时处理技术进行管涌细观模型试验，从细观角度研究砂土管涌机理。研究得到管涌发展过程中颗粒的移动规律，渗漏通道的形成特点，流速、颗粒位移场等随水力梯度的变化特点，并从级配角度分析土样的稳定性，得到土体的稳定性与级配曲线形状及不均匀系数等因素有关的结论。结果表明，管涌形成过程中流速、颗粒运动和渗透通道形成规律很大程度上取决于骨架颗粒、可动颗粒以及水之间的相互作用，表明水土相互作用贯穿管涌发展的全过程。

英文摘要：

Based on the image visual tracing and real-time digital process techniques, a study is made of the mesoscopic mechanism of piping in sandy soils. An analysis is also made of the moving regular of particles, the leakage passage formation feature, and the particles displacement field and so on. The internal stability of soils is studied from the perspective of gradation. Results show that the stability of soils relates closely to the shape of gradation curves and coefficient of ununiformity. The fluid velocity, particle movement and leakage passage formation regular during piping are greatly dependent on the interaction of skeleton particles, movable particles and fluid. The interaction of soil and fluid exists through the whole piping.