Solute transport in a single fracture with time-dependent aperture due to chemically medicated changes
2014 (English)In: International Journal of Rock Mechanics And Mining Sciences, ISSN 1365-1609, Vol. 66, 69-75 p.Article in journal (Refereed) Published
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.
Solute transport, Pressure solution, Rock fracture, Time-dependent aperture
IdentifiersURN: urn:nbn:se:su:diva-102989DOI: 10.1016/j.ijrmms.2013.12.004ISI: 000333506000009OAI: oai:DiVA.org:su-102989DiVA: diva2:714226