Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • 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
Failure mechanisms around shallow tunnels in brittle rock
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.ORCID iD: 0000-0002-9766-0106
2007 (English)In: 11th Congress of the International Society for Rock Mechanics: The Second Half Century of Rock Mechanics / [ed] L.R. e Sousa; C. Olalla; N.F. Grossman, Taylor and Francis Group , 2007, Vol. 2, 883-890 p.Conference paper, Published paper (Refereed)
Abstract [en]

As part of an ongoing study on the mechanical characteristics of the damaged rock zone (DRZ) around a tunnel boundary and its influence on the overall behaviour of the near-field host rock, a numerical study was conducted to investigate the dominant rock mass failure mechanisms around shallow tunnels located in a body of brittle rock mass. Preliminary studies have clearly indicated that, the rock mass behaviour was largely dictated by the different yield mechanisms involved. These mechanisms appear to be multifarious due to the complex state of the induced stresses around the tunnel boundary at shallow depth. Some of these yield mechanisms are often difficult to capture using the traditional yield criterion such as the Mohr-Coulomb. In the study reported in this paper a series of computer simulations were performed using typical in-situ stresses and rock mass conditions generally encountered in shallow tunnelling projects in Sweden. The presence of a disturbed/damaged rock zone with finite thickness was also added into the models. Due to the nature of the simulations the FLAC2D code was selected and used. The values for the input parameters were estimated using a systematic procedure. To prevent premature tensile yielding due to transient loading traction was applied during tunnel excavation. The results show that, the dominant yield mechanism occurring around the shallow tunnel in brittle rock is the one of tensile nature. Compressive mechanisms do occur but seems to be less critical to overall performance of the tunnel. However, they do influence the overall behaviour of the rock mass response. The results further indicated that, the ‘true' locality of instability could be predicted from elastic analyses, by observing if all the major principle stresses are in tension in that locality. The shear strain increment plots of the model in plastic mode further supported this observation.

Place, publisher, year, edition, pages
Taylor and Francis Group , 2007. Vol. 2, 883-890 p.
National Category
Other Civil Engineering
Research subject
Mining and Rock Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-26922Local ID: 030bbdf0-727a-11dc-86ab-000ea68e967bISBN: 978-0-415-45085-0 (print)OAI: oai:DiVA.org:ltu-26922DiVA: diva2:1000102
Conference
Congress of the International Society for Rock Mechanics : 09/07/2007 - 13/07/2007
Note
Godkänd; 2007; Bibliografisk uppgift: Även publicerad i SveBeFo Rapport 85; 20071004 (davsai)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved

Open Access in DiVA

fulltext(307 kB)18 downloads
File information
File name FULLTEXT01.pdfFile size 307 kBChecksum SHA-512
0159183a2e12f4a92e6296981e67d13273b73b0b81c5b8a334e044193f797108806a0fcce79f72740c17faf7dc0737c0bab7f8515ea6486ecc426f5d560bf930
Type fulltextMimetype application/pdf

Other links

http://www.isrm2007.org/website/

Search in DiVA

By author/editor
Saiang, DavidNordlund, Erling
By organisation
Mining and Geotechnical Engineering
Other Civil Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 18 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

isbn
urn-nbn

Altmetric score

isbn
urn-nbn
Total: 9 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • 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