Analysis of Radionuclide Transport Through Fractured Geologic Media by Percolation Theory

渗流理论分析放射性核素在破碎地质介质中的迁移

• 批准号: 02452290
• 负责人: SUZUKI Atsuyuki
• 金额: $ 3.07万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-02452290/
• 关键词: Radioactive Waste Management; Geologic Disposal; Fracture Network; Percolation Theory; Disordered Media; Dispersion; Monte Carlo Simulation; 不規則媒体; 分散; 亀裂ネットワ-ク; ニア・フィ-ルド; パ-コレ-ション理論; 拡散; ランダム・ウォ-ク・シミュレ-ション

Anomalous diffusion on 2-dimensional, or 3-dimensional percolation clusters were analysed by the exact enumeration method, and a generalized formulation for anomalous diffuion in terms of anomalous diffusion exponent, fractal and fracton dimensions was established. By this formulation normal Fickian diffusion can also be expressed as a special case.Mass transport in randomly-distributed lines in a 2-dimensional space, which is considered as a simulation of geological fracture networks, was analyzed both experimentally and computationally, to investigate effects of flow in a network. In the experimental work, random-line networks were realized on photosensitive resin. Analysis of breakthrough curves reveals that dispersivity is equal to correlation length of random-line networks, and that networks of less connectivity indicates greater correlation length or dispersivity. Correlation length of well-connected networks is roughly in the same order as the length of lines distributed. In the computational work, tracer dispersion in the random-line network was simulated by the Monte Carlo method. Molecular diffusion of tracers into dead-end pores and low-flow regions in networks is found to be the key mechanism of non-Fickian behavior of tracer dispersion.Characteristic length of electrical conductivity and permeability of porous media made by consolidating glass beads can be predicted by the original radius distribution of glass beads.

本文用精确计数法分析了二维和三维渗流团簇上的反常扩散，并建立了反常扩散指数、分形维数和分形子维数的一般表达式。本文将二维空间中随机分布的物质输运视为地质裂隙网络的模拟，从实验和计算两个方面分析了裂隙网络中流动对物质输运的影响。在实验工作中，在光敏树脂上实现了随机线网络。穿透曲线的分析表明，分散性等于随机线网络的相关长度，并且连接性越小的网络指示越大的相关长度或分散性。良好连通网络的相关长度与分布线的长度大致相同。在计算工作中，用蒙特卡罗方法模拟了示踪剂在随机线网中的弥散。示踪剂分子扩散进入网络中的死端孔和低流量区是示踪剂扩散非Fickian行为的关键机制，通过玻璃微珠初始半径分布可以预测玻璃微珠固结多孔介质的电导率和渗透率特征长度。

项目成果

Ahn,J,et al.: "Analysis Tracer Dispersion in Flow Tmough Two-Dimeusioral Neturerk of Raudonly Distributed Leires by Percolation Theory" Eos,Trausactions,American Gerphysical Union. 73. 201 (1992)

Ahn,J,et al.：“通过渗透理论分析 Raudonly 分布式 Leires 的二维网络中的示踪剂分散”Eos，Trausactions，美国 Gerphysical Union。

Ahn,J.,et al.: "Radionuclile Trausport through Fracture Neturorks by Percolation Theory" 1991Joint International Waste Managament Conference,FSME,Seoul,1991. 291-298 (1991)

Ahn, J., 等人：“通过渗透理论通过断裂网络的放射性核传输”1991 年国际废物管理联合会议，FSME，首尔，1991 年。

"Experimental Studies of Tracer Dispersion in Flow Through TwoーDimensionalNetwerks of Random Lines" Water Resources Research.

“随机线二维网络中示踪剂扩散的实验研究”水资源研究。

Ahn,J.,et al: "Analysis of Radionuclide Transport Through Fracture Networks by Percolation Theory" Journal of Nuclear Science and Technology. 30. (1991)

Ahn，J.，等人：“通过渗流理论分析放射性核素通过裂缝网络的传输”核科学与技术杂志。

Ahn,J.,et al.: "Analysis of Radionuclide Trausport Through Fracture NetworK by Percolation Theory" Journal of Nuclear Science and Technology. 30. 433-446 (1991)

Ahn,J.,et al.：“利用渗流理论通过断裂网络分析放射性核素传输”《核科学与技术杂志》。