泥膜形成与状态划分细观分析及模型试验研究

刘成; 孙钧; 杨平; 王海波

doi:10.11779/CJGE201403005

泥膜形成与状态划分细观分析及模型试验研究 English Version

刘成¹,
孙钧^{2, 3},
杨平¹,
王海波¹

1. 南京林业大学土木工程学院,江苏南京 210037; 2. 同济大学岩土及地下工程教育部重点实验室,上海 200092; 3. 同济大学地下建筑与工程系,上海 200092

基金项目: 国家自然科学基金项目（51308302）; 教育部博士点基金资助项目（20133204120014）; 江苏高校优势学科建设工程资助项目（2013）; 住建部基金项目（2013-K3-16）

详细信息

作者简介:
刘成(1982- )，男，江苏宿迁人，博士，讲师，主要从事地下渗流、动力分析及离散元等方面的研究与教学工作。E-mail: lcheng83@163.com。

中图分类号: TU443
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出版历程
- 收稿日期: 2013-07-23
- 发布日期: 2014-03-19

Mesoscopic analysis and model test on formation process and state division of slurry membrane

1. College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China; 2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 3. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China

摘要

摘要: 泥水盾构施工中泥浆在高压作用下侵入土层形成不同状态的泥膜,泥膜的形成机理复杂,但其状态划分依据相对简单。基于离散元程序YADE编制了流体与颗粒相互作用及粒间长程引力作用模型,从粒径比、粒间范德华力、流体初始流速以及泥浆颗粒密度几个方面分析了泥浆侵入土层初始恒速阶段的堆积状态,确定土层最紧密堆积对应的泥膜状态理论下限值。采用静置后的泥浆侵入土层模型试验分析了两组土层粒径的泥膜状态,表明粒径比对泥膜状态的影响与离散元分析结果、泥膜状态划分理论相吻合。初步建立了泥膜形成过程的宏细观联系,弥补了传统过滤理论和离散元法未考虑颗粒侵入土层动态形成泥膜的不足。
- 泥膜状态 /
- YADE /
- 细观分析 /
- 范德华力 /
- 模型试验
Abstract: In the slurry shield construction, slurry membrane forms when slurry invades stratum under high pressure. The mechanism of slurry membrane formation is complicated, but the criteria for the state division are relatively easy. A model of fluid-particle interaction and intergranular long-range attractive force is developed based on the discrete element program YADE to analyze the packing state of slurry particles during the initial constant rate period from the viewpoint of partical diameter ratio, Van der Waals force, initial fluid velocity and slurry particle density, to determine the lower limit value of slurry membrane state corresponding to the closest packing of soil particles. The slurry membrane state with two diameters of soil particles is also analyzed by conducting the model test using the slurry after standing. The result of model test shows that the influence of partical diameter ratio on slurry membrane state is consistent with the DEM simulation and the theory of state division of slurry membrane. The macro-meso relation is established for slurry membrane formation process. This study remedies the defects of the conventional filtration theory and DEM simulation which do not consider slurry invading stratum and slurry membrane forming dynamically.
- slurry membrane state /
- YADE /
- mesoscopic analysis /
- Van der Waals force /
- model test

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参考文献(13)

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