Understanding coupled stress, flow and transport processes in fractured rocks
2013 (English)In: Geosystem Engineering, ISSN 1226-9328, Vol. 16, no 1, 2-25 p.Article in journal (Refereed) Published
This paper presents a review of a systematic research program for understanding the scale and stress effects on the transport behaviors of fractured crystalline rocks, using a hybrid discrete element and particle tracking approach. The motivation is the importance of understanding the stress effects on the behaviors of contaminant transport in fractured crystalline rocks, which is an important issue of rock mechanics for environmental safety assessments of many rock engineering projects. The study is divided into three steps: the first step is a basic study that established the mathematical platform for deriving the conditions, criteria, basic approaches, and test case results for investigating the stress and scale effects on the hydraulic behavior of the fractured rock concerned. At the second step, based on outstanding issues drawn from the first step, the study was extended to consider the effects of the correlation between the fracture aperture and size (represented by trace length) on the permeability of the fractured rock and uncertainties in deriving equivalent continuum properties of fractured rocks. The third step added the particle/solute transport processes to the mathematical platform, including different retardation mechanisms, so that the impact of stress on safety can be directly evaluated, even though it can only be done conceptually. The obtained results show that stress, scale, and inter-parameter correlations of the fracture system geometry are dominant issues for the understanding and characterization of coupled hydro-mechanical processes of fractured rocks and play a significant role for understanding the mass transport behavior in them, with direct impact on geo-environmental safety.
Place, publisher, year, edition, pages
2013. Vol. 16, no 1, 2-25 p.
coupled process, discrete fracture network, equivalent continuum, equivalent property, fractured rock, representative elementary volume
IdentifiersURN: urn:nbn:se:kth:diva-127179DOI: 10.1080/12269328.2013.780709ScopusID: 2-s2.0-84880958538OAI: oai:DiVA.org:kth-127179DiVA: diva2:643806
QC 201308282013-08-282013-08-282013-08-28Bibliographically approved