渗流侵蚀发展过程复杂，影响因素较多，并且由渗流侵蚀引发的灾害频发，易对结构安全造成严重威胁。为研究振动作用下不同影响因素对渗流侵蚀的影响，本文采用CFD-DEM耦合分析方法，通过8组间断级配砂土试样的渗流侵蚀实验，研究了振动作用下土体细粒含量、围压以及水力梯度对渗流侵蚀过程的影响，并由细粒流失比、试样轴向变形等分析间断级配砂土试样的细观响应。研究表明，振动作用下细粒流失比更大、轴向变形更显著，且振动作用对渗流侵蚀具有加剧作用，对上层颗粒流失的影响最大，对中层颗粒流失影响最小；细粒含量越大，细粒流失也越多，稳定所需时间也越长，且细粒含量是影响试样轴向变形的重要因素；试样所受围压越大，试样细粒流失越大，轴向变形也越大且围压对振动具有一定的弱化作用；在渗流侵蚀发展阶段，水力梯度越大，细粒流失比也越大，且水力梯度对试样轴向变形影响最小。

The development process of seepage erosion is complex, influenced by numerous factors, and disasters triggered by seepage erosion are frequent, posing serious threats to structural safety. To study the effects of various factors on seepage erosion under vibration, this paper employs a CFD-DEM coupled analysis method. Seepage erosion experiments on eight groups of gap-graded sand samples were conducted to investigate the effects of fine particle content, confining pressure, and hydraulic gradient on the seepage erosion process under vibration. The micro-responses of the gap-graded sand samples were analyzed based on the fine particle loss ratio and axial deformation. The results show that under vibration, the fine particle loss ratio is higher, and axial deformation is more significant. The vibration has an aggravating effect on the seepage erosion, with the greatest effect on the upper layer particles, while the middle layer particles are least affected. Higher fine particle content leads to greater fine particle loss and longer stabilization time, making it a significant factor affecting axial deformation. Greater confining pressure results in more fine particle loss and axial deformation, with confining pressure having a mitigating effect on vibration. In the development stage of seepage erosion, a larger hydraulic gradient results in a higher fine particle loss ratio, with the hydraulic gradient having the least effect on axial deformation.

U25

国家自然科学基金(52238010,52090082,52108381)；国家重点研发计划课题（2022YFC3800905）；上海市科学技术委员会科研计划项目（23DZ1202806;21DZ1200601）；上海市“科技创新行动计划”优秀学术/技术带头人计划项目（22XD1430200）；上海浦江计划 (23PJD104)