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Solute transport in a single fracture with time-dependent aperture due to chemically medicated changes
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Chemical Engineering.ORCID iD: 0000-0001-6801-9208
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Chemical Engineering.
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Land and Water Resources Engineering.
2014 (English)In: International Journal of Rock Mechanics And Mining Sciences, ISSN 1365-1609, E-ISSN 1873-4545, Vol. 66, 69-75 p.Article in journal (Refereed) Published
Abstract [en]

In addition to mechanical loading, the transport properties of rock fractures are also affected by chemically mediated changes, such as pressure solution, stress corrosion and free-face dissolution, among others. Based on a time-dependent model of fracture closure under constant normal stresses, the transport behavior of contaminants in a slowly closing fracture is studied using a finite difference scheme. The results show that the contaminant penetrating along the fracture plane gradually becomes slow or almost negligible during the process of fracture closure induced by chemical processes, whereas the matrix diffusion of contaminants is active all the time. This finding indicates that diffusion into the rock matrix perpendicular to the advective flow direction always plays an important role in determining the fate of contaminant in rock fractures. The smaller the fluid flow due to fracture closure and the larger impact the matrix diffusion can further delay the solute transport.

Place, publisher, year, edition, pages
2014. Vol. 66, 69-75 p.
Keyword [en]
Pressure solution, Rock fracture, Solute transport, Time-dependent aperture
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-143002DOI: 10.1016/j.ijrmms.2013.12.004ISI: 000333506000009Scopus ID: 2-s2.0-84893097083OAI: oai:DiVA.org:kth-143002DiVA: diva2:705143
Note

QC 20140314

Available from: 2014-03-14 Created: 2014-03-14 Last updated: 2017-12-05Bibliographically approved

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