裂隙网络管道模型弥散试验

doi:10.13278/j.cnki.jjuese.201601207

摘要/Abstract

摘要：

为了探求不同裂隙几何参数对裂隙网络溶质运移的影响,基于离散裂隙网络思想和优势流、沟槽流理论,建立裂隙管道网络概念模型,搭建不同管径、不同连通方式的管道网络试验装置,进行渗流和溶质运移实验。运用应用广泛的模拟软件CHEMFLO-2000建立等效多孔介质模型,拟合不同几何参数下等效弥散度,定量刻画不同管道网络几何参数对溶质运移的影响,讨论了不同管径、连通方式等与等效弥散度之间的关系。通过进一步分析得出:在连通方式相同的情况下,不同管径的管道网络等效弥散度存在差异,但是差异不大;溶质在小管径中的穿透时间短于大管径,穿透曲线缓和程度相差不大;管道网络连通方式越复杂,其等效弥散度越大、对溶质运移的影响越大、穿透曲线越缓和、路径越长,等效弥散度越大;用这种等效弥散度的方法表征管道网络对溶质运移的影响,与多孔介质弥散度具有相似性;管道数目、管道面数目与等效弥散度成正相关关系,且等效弥散度随尺度的增大而增加。

关键词: 裂隙, 管道模型, 物理模型, 溶质运移, 等效弥散度

Abstract:

In order to investigate the effects made by different geometric parameters on solute transport in fracture networks, a fracture network pipe flow conceptual model was established based on the discrete fracture network model and preferential flow groove theory. A representative physical model was built in different pipe diameters with different methods of connection. A set of fluid flow and solute transport experiments were carried out. In order to quantitatively analyze the effects made by the different pipeline network geometric parameters on solute transport, a modeling software package CHEMFLO-2000 was used to set up an equivalent porous medium model and calculate the equivalent dispersivity. The results show that with the same connective method, no obvious difference of equivalent dispersivity is found among pipe networks in different pipe diameters, the solute transport time increases with the increasing of diameters, and the curves breakthrough smoothness is similar to each other. Moreover, the more complex the connection mode is, the bigger the equivalent dispersivity is. Furthermore, the longer the transport path is, the bigger the equivalent dispersivity is. In conclusion, this parameter of equivalent disperisivity can be used to characterize the influence of the fracture pipe network on solute transport like that in porous media. The equivalent dispersivity has a positive correlation with the number of pipelines and pipe surfaces, and grows with the increase of spatial scales correspondingly.

Key words: fracture, pipe network, physical model, solute transport, equivalent dispersivity

中图分类号:

P641.69

刘波, 王明玉, 张敏, 李玮. 裂隙网络管道模型弥散试验[J]. 吉林大学学报(地球科学版), 2016, 46(1): 230-239.

Liu Bo, Wang Mingyu, Zhang Min, Li Wei. Dispersivity Experimental Investigation Based on Fracture Network Pipe Model[J]. Journal of Jilin University(Earth Science Edition), 2016, 46(1): 230-239.

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