Water pressure effects on strength and deformability of fractured rocks under low confining pressures
2015 (English)In: Journal of Rock Mechanics and Geotechnical Engineering, ISSN 1674-7755, Vol. 48, no 3, 971-985 p.Article in journal (Refereed) Published
The effect of groundwater on strength anddeformation behavior of fractured crystalline rocks is one ofthe important issues for design, performance and safetyassessments of surface and subsurface rock engineeringproblems. However, practical difficulties make the directin situ and laboratory measurements of these properties offractured rocks impossible at present, since effects of complexfracture system hidden inside the rock masses cannot beaccurately estimated. Therefore, numerical modeling needs tobe applied. The overall objective of this paper is to deepenour understanding on the validity of the effective stressconcept, and to evaluate the effects of water pressure onstrength and deformation parameters. The approach adopteduses discrete element methods to simulate the coupled stressdeformation-flow processes in a fractured rock mass withmodel dimensions at a representative elementary volume(REV) size and realistic representation of fracture systemgeometry. The obtained numerical results demonstrate thatwater pressure has significant influence on the strength, butwith minor effects on elastic deformation parameters, comparedwith significant influence by the lateral confiningpressure. Also, the classical effective stress concept to fracturedrock can be quite different with that applied in soilmechanics. Therefore, one should be cautious when applyingthe classical effective stress concept to fractured rock media.
Place, publisher, year, edition, pages
2015. Vol. 48, no 3, 971-985 p.
Coupled hydro-mechanical, Effective stress, Discrete element methods (DEM-DFN), UDEC, Failure criteria, Fractured crystalline rocks
Engineering and Technology
IdentifiersURN: urn:nbn:se:kth:diva-155713DOI: 10.1007/s00603-014-0628-3ISI: 000352905100006ScopusID: 2-s2.0-84928376984OAI: oai:DiVA.org:kth-155713DiVA: diva2:762155
Updated from E-publ to published. QC 201506302014-11-102014-11-102015-08-05Bibliographically approved