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Investigation of blast damage from string emulsion in the wall and floor of two experimental tunnels in Äspö HRL
Swedish Nuclear Fuel and Waste Management Company (SKB).
Forcit Sweden AB.
2015 (English)Conference paper, Oral presentation only (Refereed)
Abstract [en]

A project was initiated by SKB and Forcit Sweden AB to investigate blast damage from emulsion explosives in two experimental tunnels in Äspö HRL. The new tunnels were excavated with emulsion explosives (Kemitti 810) and charging was done with a Forcit charging unit model 201. Extensive documentation of the excavation works was conducted, so that charge concentration per hole is traceable in contour, floor and helpers. Contour and floor holes were charged with concentration 0.35 and 0.5 kg/m respectively. In order to study blast fractures, five slots were excavated in the wall and floor. The results from mapping of the slots shows a longest blast fracture of 24.5 cm for the 0.35 kg/m charge and 24.1 cm for the 0.5 kg/m charged holes. Generally, there is a large spread in the results with few fractures longer than 20 cm.

Place, publisher, year, edition, pages
2015.
National Category
Other Civil Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-29446Local ID: 2ee0f124-d743-4167-a30f-70fa3516f3e8OAI: oai:DiVA.org:ltu-29446DiVA, id: diva2:1002670
Conference
Eurock 2015 : Future Development of Rock Mechanics 07/10/2015 - 10/10/2015
Note
Upprättat; 2015; 20160513 (henitt)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved

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https://www.onepetro.org/conference-paper/ISRM-EUROCK-2015-039 Ospecifierade

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