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Erschienen in: Environmental Earth Sciences 9/2024

01.05.2024 | Original Article

Experimental investigation on nonlinear flow and solute transport behavior in interlayer expansion fractures

verfasst von: Meng Wang, Pingye Guo, Mohua Bu, Cheng Fang, Yanwei Wang

Erschienen in: Environmental Earth Sciences | Ausgabe 9/2024

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Abstract

After the mines closed, the groundwater level quickly rises, and pollutants in the underground space will migrate outward along the flow channel, causing pollution to the surrounding environment. The different morphologies of interlayer fractures in the goaf fracture zone are one of the main flow channels, including interlayer expansion fracture. Fracture expansion can impact a local flow field, which, in turn can affect solute transport characteristics. The microscale flow field and solute transport behavior in fracture with different expansion characteristics were investigated by a microscale visualization experiment. The experimental results indicate that there is a significant difference in the pressure gradient between different expansion regions. When nonlinear flow characteristics (reflux or eddy) begin to occur within the expansion region, the pressure gradient value also begins to deviate from Darcy's law under the same Re. The maximum velocity position changes from the centerline to the upper and lower surfaces of the expansion region, a low velocity region is generated in the main flow channel, which moves to the outlet as Re increase, and the cross-section velocity curve also transforms into a bullet shape as Re increase. By developing a set of programs to establish a relationship between the average image luminance and the tracer particles concentration, the solute concentration variation curve in the expansion region was obtained. The process of solute invasion into fractures is divided into four stages. The change in the local flow field caused by the different expansion characteristics directly affects the duration of these four stages. As the area of the region increases, the proportion of the main channel area decreases relatively, the difference between the solute concentration curve of the whole fracture and the expansion region gradually decreases.

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Metadaten
Titel
Experimental investigation on nonlinear flow and solute transport behavior in interlayer expansion fractures
verfasst von
Meng Wang
Pingye Guo
Mohua Bu
Cheng Fang
Yanwei Wang
Publikationsdatum
01.05.2024
Verlag
Springer Berlin Heidelberg
Erschienen in
Environmental Earth Sciences / Ausgabe 9/2024
Print ISSN: 1866-6280
Elektronische ISSN: 1866-6299
DOI
https://doi.org/10.1007/s12665-024-11596-0

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