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Rock mass effective properties from a DFN approach
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Soil and Rock Mechanics. (Jord- och bergmekanik)
2018 (English)In: 2nd International Discrete Fracture Network Engineering Conference, DFNE 2018, American Rock Mechanics Association (ARMA) , 2018Conference paper, Published paper (Refereed)
Abstract [en]

Rock mass mechanical properties are strongly controlled by the fractures they contain. Their determination raises strong issues for many rock-engineering applications, like underground repository safety assessment, support design, slope stability or mine caving. To compensate the impossibility to perform direct in-situ measures of these properties at appropriate scales, empirical approaches classically aim to determine the rock mass equivalent properties from simple indicators. Here we propose an approach based on the complete representation of the rock mass as an intact rock with a population of discrete fractures through it (the Discrete Fracture Network). The core of the approach is the definition, at the rock mass scale, of the deformation induced by each fracture locally, including the fracture mechanical and geometrical parameters, the remote stress conditions and the interactions with the rest of the fracture population. Depending on the conditions, the resulting scaling and anisotropic effects can be critical. The method is applied to the Forsmark site in Sweden. We show that two main scaling regimes occur, where the shift from the one to the other is controlled by the ratio between the intact rock modulus, the typical fracture stiffness and the DFN size distribution. Beyond the scaling issue we quantify the resulting level of anisotropy. 

Place, publisher, year, edition, pages
American Rock Mechanics Association (ARMA) , 2018.
Keywords [en]
Anisotropy, Fracture, Geometry, Rocks, Slope stability, Anisotropic effects, Discrete fracture network, Discrete fractures, Effective property, Empirical approach, Rock engineering, Safety assessments, Underground repositories, Rock mechanics
National Category
Geophysical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-247439Scopus ID: 2-s2.0-85059356721OAI: oai:DiVA.org:kth-247439DiVA, id: diva2:1305728
Conference
2nd International Discrete Fracture Network Engineering Conference, DFNE 2018, 20 June 2018 through 22 June 2018
Note

QC20191021

Available from: 2019-04-18 Created: 2019-04-18 Last updated: 2019-10-21Bibliographically approved

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No full text in DiVA

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Scopushttp://www.dfne2018.com/

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Ivars, Diego Mas

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CiteExportLink to record
Permanent link

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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf