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  • 1.
    Johansson, Fredrik
    et al.
    KTH, Jord- och bergmekanik.
    Roslin, Mattias
    Trafikverket.
    Josefsson, Johanna
    Rise.
    Utvärdering av glasfiberbult som permanent bergförstärkning2020Report (Other academic)
    Abstract [en]

    Rock support for tunnels and caverns is usually performed with a combination of conventional steel bolts and shotcrete. The high density of the steel implies that these bolts are rather heavy. At the same time, the installation is performed manually, which can imply a risk from a work environment perspective. The use of bolts consisting of glass-fiber reinforced polymers could reduce these problems since their density is approximately four times lower than that for steel. The aim of this report has been to evaluate if glass-fiber reinforced rock bolts fulfill the requirements for permanent rock support and recommend possible further studies necessary for approval of these types of bolts as construction elements in the main load bearing system. After studying the results from Swedish and international research, the conclusion is that glass-fiber reinforced rock bolts could be suitable in the future under certain conditions, which mainly consists of a rock mass of good quality where block instability is the main failure mode and the expected strain in the rock mass is limited. At the present time, the information is insufficient and further knowledge is required before an approval of glass-fiber reinforced rock bolts should be given. The main cause is that there exists uncertainties concerning the combined effect from static long-term loading and the influence from environmental factors such as water and alkali. Further research is recommended in order to reduce these uncertainties and enable the use of glass-fiber reinforced rock bolts as construction elements in the main load bearing system. By doing so, an improved working environment and a reduced environmental impact could be achieved.

    Download full text (pdf)
    FULLTEXT01
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