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Numerical study on the continuity factor and the limits between continuous and discontinuous behaviors
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Soil and Rock Mechanics.
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Soil and Rock Mechanics.ORCID iD: 0000-0002-8152-6092
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Soil and Rock Mechanics.
2012 (English)In: ISRM International Symposium 28-30 May 2012, Stockholm, 2012Conference paper, Published paper (Refereed)
Abstract [en]

 Discontinuum approach or equivalent continuum approach is usually adopted in order to model the behavior of rock masses. The latter approach is more frequently used. However, this approach might be unacceptable for slightly-jointed rock masses. The continuity factor (CF), mainly derived from empirical experience, is defined as the ratio of the tunnel span to the block diameter. It is commonly used to determine whether a rock mass should be modeled as a continuum or a discontinuum material. Only a few analyses regarding the CF have been performed previously. In order to study the limits between continuous and discontinuous behavior, nu-merical analyses with UDEC have been performed. In these analyse, a rock mass with two sets of orthogonal joints are initially generated. From this rock mass, square areas corresponding to a certain CF are randomly chosen as models in UDEC. Confined compression test is conducted on the mentioned model and the constrained modulus (Dm) regarding this rock mass is calculated. Due to the variations of the relative loca-tions between the square and the joints cut inside, as well as the joint quantity and the joint lengths, several Dm are yielded for each CF. Several CFs are also analyzed and the results are compared with previous suggested limits between continuous and dis-continuous behaviors.

Place, publisher, year, edition, pages
2012.
Keyword [en]
rock mass behavior, continuity factor, excavation, joint
National Category
Geotechnical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-138851OAI: oai:DiVA.org:kth-138851DiVA: diva2:681851
Conference
Eurock 2012
Note

QC 20140428

Available from: 2013-12-20 Created: 2013-12-20 Last updated: 2014-04-28Bibliographically approved
In thesis
1. The Use of the Continuity Factor as a Tool to Represent Representative Elementary Volume in Rock Engineering Design
Open this publication in new window or tab >>The Use of the Continuity Factor as a Tool to Represent Representative Elementary Volume in Rock Engineering Design
2014 (English)Licentiate thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2014
Series
TRITA-JOB. LIC, ISSN 1650-951X ; 2025
Keyword
rock mass, scale effect, representative elementary volume, continuity factor
National Category
Geotechnical Engineering
Research subject
Civil and Architectural Engineering
Identifiers
urn:nbn:se:kth:diva-144591 (URN)
Presentation
2014-05-16, Sal B1, Brinellvägen 23, entreplan, KTH, Stockholm, 15:36 (English)
Opponent
Supervisors
Note

QC 20140428

Available from: 2014-04-28 Created: 2014-04-25 Last updated: 2014-04-28Bibliographically approved

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Johansson, Fredrik

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