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Mesoscopic analysis of slurry membrane state for slurry invading stratum and verification of packing unidirectionality
Author(s): 
Pages: 40-48
Year: Issue:  1
Journal: Hydro-Science and Engineering

Keyword:  slurry membrane statemesoscopic analysisVan der Waals forcespatial force chain structure;
Abstract: 基于离散元程序YADE编制了流体与颗粒相互作用及粒间范德华力作用模型,从粒径比、粒间范德华力两个方面分析了泥浆侵入土层初始恒速阶段的堆积状态.结果表明,范德华力是影响泥膜形成速度和空间力链结构的重要因素,使泥浆颗粒堆积比例产生量的变化,而粒径比是决定泥膜状态的关键因素;力链结构在空间的分布和联系反映了泥浆颗粒在土层中堆积具有一定的连续性和单向性.渗流单向性是堆积单向性的一种重要表现形式,通过砂-膨润土混合物变水头渗透试验给出了验证.增大范德华力可以在土层表面更快形成泥皮,这为通过理论或试验手段提高流体介质的Hamaker常数来优化泥浆配比提供了理论支撑.
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