| 倪小东,寇恒绮,左翔宇,王媛,陆江发.基于透明土技术与颗粒流方法联合开展管涌细观机理研究[J].水利学报,2021,52(12):1482-1497 |
| 基于透明土技术与颗粒流方法联合开展管涌细观机理研究 |
| Research on meso mechanism of piping based on transparent soil technology and particle flow method |
| 投稿时间：2021-06-18 |
| DOI：10.13243/j.cnki.slxb.20210549 |
| 中文关键词: 管涌 细观机理 透明土 三维重构 颗粒流 力链 |
| 英文关键词: piping meso mechanism transparent soil 3D reconstruction particle flow force chain |
| 基金项目:国家重点研发计划项目（2017YFC1502602）；国家自然科学基金项目（51779083）；中央高校专项基金项目（B200202077） |
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| 中文摘要: |
| 我国现今拥有堤防总长度超30万公里，但管涌型渗透破坏频发，造成极大社会经济损失，故开展管涌细观机理研究对于解决堤防工程安全问题具有重要意义。当前有关管涌细观机理研究主要从模型试验、数值模拟两个方面开展，并且大多从颗粒摩擦系数、颗粒级配和细料含量等角度揭示该细观机理。本文提出一种基于透明土技术、颗粒流模拟联合开展该细观机理研究的方法，并从颗粒间接触力链的细观角度分析颗粒摩擦系数、颗粒级配和细料含量对管涌发生、发展的影响。首先结合PLIF（平面激光诱导荧光技术）与透明土技术自行设计可视化模型试验平台，其次基于MRI（磁共振成像）技术，借助Avzio软件实现对透明土样二维切片的三维重构，然后将重构模型导入PFC3D中并进行相同条件下的颗粒流模拟，通过比对模型试验与数值模拟结果，验证本方法开展管涌细观机理研究的可靠性，最后进行重构模型在不同颗粒摩擦系数、颗粒级配和细料含量条件下的数值模拟，并从力链角度论述各组试验规律。本文可为管涌细观机理研究提供一种置信度高、可行性好的新途径。 |
| 英文摘要: |
| The total length of embankment in China now exceeds 300，000 kilometers， but the frequent seepage damage caused by piping causes great social and economic losses. It is of great significance to research the meso mechanism of piping for solving safety problems of levee engineering. At present， the research on meso mechanism of piping mainly focuses on model test and numerical simulation，and the meso mechanism is mostly revealed from the perspective of particle friction coefficient， particle gradation and fine particle content. In this paper，a method of research on the meso mechanism based on transparent soil technology and particle flow simulation is proposed，and the impacts of particle friction coefficient，particle gradation and fine particle content on the occurrence and development of piping are analyzed from the mesoscopic perspective of contact force chain between particles. Firstly， a visual model test platform was independently developed by combining PLIF （plane laser induced fluorescence technology） and transparent soil technology. Secondly， based on the principle of MRI （magnetic resonance imaging）， the 3D reconstruction of the 2D slice sets of transparent soil samples was realized by using software named Avzio. Then，the reconstructed model was imported into PFC3D and the particle flow simulation under the same condition as model test was carried out. The reliability of this method to research meso mechanism of piping was verified by comparing the results of model test and numerical simulation. Finally， the numerical simulation of reconstructed soil samples under different particle friction coefficients， particle gradations and fine particle contents were carried out， and the test laws of each group were explained from the perspective of force chain. This paper provides a new approach with high confidence and good feasibility for the research of meso mechanism of piping. |
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