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Measuring of Over-Break and the Excavation Damage Zone in Conventional Tunneling
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
2017 (English)In: Proceedings of the World Tunnel Congress 2017: Surface challenges – Underground solutions / [ed] NFF, 2017Conference paper, (Refereed)
Abstract [en]

During tunnel excavation, blast induced damage or Excavation Damage Zone(EDZ) interacts with existing geological structure of the rock-mass. This can and cause over-breakand stability issues during and after excavation. Today the EDZ is determined by correlation-basedmethods, although direct measurement is possible. This paper presents investigation methods forEDZ quantification during excavation. The discussed methods are applied in the Stockholm By-Passproject. The literature review and the case study applications are summarized in a comprehensivetable with benefits and limitations of the different investigation methods. The methods discussed canbe used to achieve a better quality of the tunnel contour, especially the direct investigationtechniques. The EDZ can be reduced by adjusting the blasting plan, specific charge as well asimproving the quality of the drill and blasting procedures.

Place, publisher, year, edition, pages
2017.
National Category
Construction Management
Identifiers
URN: urn:nbn:se:ltu:diva-64597OAI: oai:DiVA.org:ltu-64597DiVA: diva2:1117001
Conference
ITA-AITES World Tunnel Congress, Bergen, 9-15. June 2017
Projects
Blasting damage, Drill an Blast, Excavation Damage
Available from: 2017-06-28 Created: 2017-06-28 Last updated: 2017-07-03

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  • apa
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Output format
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