A Block-Scale Stress-Permeability Relationship of a Fractured Rock Determined by Numerical Experiments
2004 (English)In: Coupled Thermo-Hydro-Mechanical-Chemical Processes in Geo-Systems — Fundamentals, Modelling, Experiments and Applications, Elsevier, 2004, no C, 269-274 p.Chapter in book (Refereed)
We present the stress induced permeability change in a fractured rock with special focuses on 1) fracture closure/opening process, 2) anisotropic stress conditions, and 3) fracture dilation. In order to overcome the limitations from the experimental study on a single fracture or analytical study on orthogonal and/or persistent fracture models, realistic Discrete Fracture Network (DFN) models were used as a geometrical basis. A series of numerical experiments on fluid flow are conducted under different stress boundary conditions for calculation of equivalent permeability. From the analysis on the realistic DFN model, this paper demonstrates the decrease of permeability with the fracture normal closure, increased anisotropy in permeability with anisotropic stress and increase of permeability and significant channelling effect due to fracture dilation. It is shown that block-scale permeability change in fractured rock depends not only on stress magnitude but also on stress orientation and differential stresses.
Place, publisher, year, edition, pages
Elsevier, 2004. no C, 269-274 p.
, Elsevier Geo-Engineering Book Series, ISSN 15719960
IdentifiersURN: urn:nbn:se:kth:diva-156923DOI: 10.1016/S1571-9960(04)80052-1ScopusID: 2-s2.0-77957061831OAI: oai:DiVA.org:kth-156923DiVA: diva2:769431
QC 201412082014-12-082014-12-042014-12-08Bibliographically approved