Effective use of fibres of various types and material for shotcrete in rock support for tunnels

Large volumes of steel fibre reinforced shotcrete (sprayed concrete) and steel bolts are commonly used to support tunnels in hard rock. This generates a high CO2-footprint which must be reduced in order to decelerate the continuously increasing average temperature worldwide caused by the emissions o...

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Bibliographic Details
Published in:Expanding Underground - Knowledge and Passion to Make a Positive Impact on the World pp. 932 - 939
Main Authors: Sjölander, A., Ansell, A., Nordström, E.
Format: Book Chapter
Language:English
Published: United Kingdom CRC Press 2023
Taylor & Francis Group
Edition:1
Subjects:
Geological Strength Index
Cast Beams
Overburden
Basalt Fibres
Synthetic Fibres
Steel Fibres
Post-cracking Performance
ASTM C1550
Residual Flexural Strength
Excavated Rock Mass
Rock Mass
Above Ground
Fibre Types
BIM
BIM Model
Energy Absorption
Required Energy Absorption
Rock Bolts
Shotcrete Mix
Rock Support
EPD
SEM
Steel Rock Bolts
SCL
Fibre Reinforced Shotcrete
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Summary:Large volumes of steel fibre reinforced shotcrete (sprayed concrete) and steel bolts are commonly used to support tunnels in hard rock. This generates a high CO2-footprint which must be reduced in order to decelerate the continuously increasing average temperature worldwide caused by the emissions of greenhouse gases. Thus, alternative design methods and the possibility to use other materials than steel are currently investigated. Work is ongoing on testing the load-bearing capacity of shotcrete reinforced with fibres of steel, basalt and synthetic materials. This also includes a comparison between tests using Round Determinate Panels (RDP) and four-point bending of beams. Moreover, the practical use of RDP testing as a quality control methodology is also investigated in situ. Here, the goal is to identify several shotcrete mixes suitable for use in tunnelling so that the right material and fibre volume can be used in the right place.
DOI:10.1201/9781003348030-112