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Experiences from the planning, construction and supporting of a road tunnel subjected to heavy rockbursting

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Summary

A 5360 m long road tunnel along a fjord with mountains rising steeply up to 1500 meters above sea level has recently been completed in Norway. 3 km of the tunnel was subjected to rockbursting caused by high and anisotropic stresses in the Precambrian gneisses. During the construction it was necessary to install 15 000 rock-bolts. Steelfibre reinforced shotcrete was successfylly applied for the first time to help stabilize the spalling rock. Supporting measures were only needed for the half of the tunnel closest to the fjord. 2600 m3 shotcrete was used.

The paper outlines the preinvestigations and the design approach used for tunnels subjected to high and anisotropic stresses, and gives information about the construction and the support works carried out. A tunnel mapping system is described together with a classification of rockbursting activity in tunnels. Stresses in the rock were calculated by the use of finite element models and measured with “doorstopper” cells and the CSIR three-dimensional gauge. Comparisons of calculated and measured stresses are carried out.

Rockbursting activity as observed along the tunnel is related to the estimated and observed stresses as well as to the properties of the rocks. Simple classification systems are used to correlate the results. Experiences from the use of the support are given.

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References

  • Aasvold J. P. (1983): Shotcrete against rock fall in spalling rock in Tafjord. (In Norwegian.) In: Fjellsprengningsteknikk, bergmekanikk, geoteknikk 1983, pp. 28.1–28.21, Tapir, Trondheim.

    Google Scholar 

  • Broch E., Rygh J. A., (1976): Permanent underground openings in Norway, design approach and some examples. Underground Space, Vol. 1, pp. 87–100.

    Google Scholar 

  • Broch E., Nilsen B. (1979): Comparison of calculated, measured and observed stresses at the Ortfjell open pit (Norway). Proc. 4th Int. Congr. Rock Mechanics, Montreux, Vol. 2, pp.49–56. Rotterdam: Balkema.

    Google Scholar 

  • Broch E. (1982): The development of unlined pressure shafts and tunnels in Norway. In: Wittke (ed.): Rock Mechanics, Caverns and Pressure Shafts, pp.545–554 Rotterdam: Balkema.

    Google Scholar 

  • Broch E. (1983): Estimation of strength anisotropy using the point-load test. Int. J. Rock Mech. Min. Sci. and Geomech. Abstr., Vol. 20, pp.181–187.

    Google Scholar 

  • Einum E. B. (1982): Steelfibre shotcrete against spalling rock. Experiences from the Tafjord tunnel. (In Norwegian). In: Fjellsprengningsteknikk, bergmekanikk, geoteknikk 1981, pp.17.1–17.7 Tapir, Trondheim.

    Google Scholar 

  • Holmgren, J. (1975): Plane shotcrete layers subjected to punch loads. Fortifikationsförv. rep. 121, 4, Stockholm.

  • Myrvang, A. (1976): Practical use of rock stress measurements in Norway. ISRM-Symp. Investigations of Stress in Rock, pp. 92–99, Sydney.

  • Russenes B. F. (1974): Analyses of rockburst in tunnels in valley sides. (In Norwegian). M. Sc.-thesis, Norwegian Inst. of Technology, Trondheim, 247 pp. (unpublished).

    Google Scholar 

  • Selmer-Olsen, R. (1965): Stability of tunnels in valley sides. (In Norwegian). IVA-meddelande 142, pp. 77–83, Stockholm.

  • Selmer-Olsen R., (1970): Experiences with using rock bolts and shotcrete in areas with rockbursting problems. In: Brekke and Jørstad (ed.), Large permanent underground openings. pp.275–278, Oslo: Universitetsforlaget.

    Google Scholar 

  • Selmer-Olsen R. (1974): Underground openings filled with high-pressure water or air. Bull. Int. Ass. Engineering Geology, Vol.9, pp.91–95.

    Google Scholar 

  • Selmer-Olsen R., Broch E. (1977): General design procedure for underground openings in Norway. In: Bergman (ed.), Storage in excavated rock caverns, pp.219–226. Oxford: Pergamon Press.

    Google Scholar 

  • Sørheim, S. (1981): Variation in rock stresses and support in the Heggura road tunnel. (In Norwegian). M. Sc.-dissertation Norwegian Inst. of Technology, Trondheim, 135 p. (unpublished).

    Google Scholar 

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Authors and Affiliations

  1. Norwegian Institute of Technology, Trondheim, Norway

    E. Broch

  2. A. B. Berdal, Consulting Engineers, Sandvika, Norway

    S. Sørheim

Authors
  1. E. Broch
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  2. S. Sørheim
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Broch, E., Sørheim, S. Experiences from the planning, construction and supporting of a road tunnel subjected to heavy rockbursting. Rock Mech Rock Engng 17, 15–35 (1984). https://doi.org/10.1007/BF01088368

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  • DOI: https://doi.org/10.1007/BF01088368

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