Change search
ReferencesLink to record
Permanent link

Direct link
Stress-dependent permeability of fractured rock masses: a numerical study
KTH, Superseded Departments, Land and Water Resources Engineering.
KTH, Superseded Departments, Land and Water Resources Engineering.
2004 (English)In: International Journal of Rock Mechanics And Mining Sciences, ISSN 1365-1609, Vol. 41, no 7, 1191-1210 p.Article in journal (Refereed) Published
Abstract [en]

We investigate the stress-dependent permeability issue in fractured rock masses considering the effects of nonlinear normal deformation and shear dilation of fractures using a two-dimensional distinct element method program, UDEC, based on a realistic discrete fracture network realization. A series of "numerical" experiments were conducted to calculate changes in the permeability of simulated fractured rock masses under various loading conditions. Numerical experiments were conducted in two ways: (1) increasing the overall stresses with a fixed ratio of horizontal to vertical stresses components; and (2) increasing the differential stresses (i.e., the difference between the horizontal and vertical stresses) while keeping the magnitude of vertical stress constant. These numerical experiments show that the permeability of fractured rocks decreases with increased stress magnitudes when the stress ratio is not large enough to cause shear dilation of fractures, whereas permeability increases with increased stress when the stress ratio is large enough. Permeability changes at low stress levels are more sensitive than at high stress levels due to the nonlinear fracture normal stress-displacement relation. Significant stress-induced channeling is observed as the shear dilation causes the concentration of fluid flow along connected shear fractures. Anisotropy of permeability emerges with the increase of differential stresses, and this anisotropy can become more prominent with the influence of shear dilation and localized flow paths. A set of empirical equations in closed-form, accounting for both normal closure and shear dilation of the fractures, is proposed to model the stress-dependent permeability. These equations prove to be in good agreement with the results obtained from our numerical experiments.

Place, publisher, year, edition, pages
2004. Vol. 41, no 7, 1191-1210 p.
Keyword [en]
stress-dependent permeability, fractured rock, distinct element method, discrete fracture network, channeling
National Category
Geotechnical Engineering
URN: urn:nbn:se:kth:diva-40512DOI: 10.1016/j.ijrmms.2004.05.005ISI: 000224005100010ScopusID: 2-s2.0-4344673745OAI: diva2:442673
QC 20110922Available from: 2011-09-22 Created: 2011-09-16 Last updated: 2011-09-22Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textScopus

Search in DiVA

By author/editor
Min, Ki BokJing, Lanru
By organisation
Land and Water Resources Engineering
In the same journal
International Journal of Rock Mechanics And Mining Sciences
Geotechnical Engineering

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 29 hits
ReferencesLink to record
Permanent link

Direct link