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Practical guidelines for shotcrete work close to blasting and vibration in hard rock
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Concrete Structures.
2019 (English)Conference paper, Published paper (Refereed)
Abstract [en]

Limited knowledge on safe vibration levels near newly sprayed concrete (shotcrete) often leads to over-conservative limits in underground construction and tunnelling, with additional costs and planning uncertainties as a consequence. Work on compiling a database of practical vibration levels for shotcrete work close to blasting in hard rock have been initiated and will provide guidelines for safe distances and waiting times for newly sprayed wet-mix shotcrete. A large number of calculations are carried out with a previously developed and relatively computationally effective numerical elastic stress wave propagation model, which will result in a systematically compiled database. These guidelines, giving relationships between the amount of explosives, distance, rock type, shotcrete type, age and thickness, will be of great value as reference for design work and facilitate comparisons with in situ data. It will be possible to adopt the design to ensure undamaged and safer shotcrete constructions with longer service life.

Place, publisher, year, edition, pages
2019.
National Category
Civil Engineering
Research subject
Civil and Architectural Engineering, Concrete Structures
Identifiers
URN: urn:nbn:se:kth:diva-260964OAI: oai:DiVA.org:kth-260964DiVA, id: diva2:1356191
Conference
World Tunnel Congress, Naples, Italy. 2019
Available from: 2019-10-01 Created: 2019-10-01 Last updated: 2019-10-01

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Ansell, Anders

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