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Rock Mechanics and Rock Engineering

, Volume 27, Issue 4, pp 235–251 | Cite as

Shear sliding failure of the jointed roof in laminated rock mass

  • J. Q. Ran
  • E. K. S. Passaris
  • P. Mottahed
Article

Summary

The jointed roof in laminated rock mass may be capable of self-support and sustaining transverse load and can be analysed by the voussoir beam notation. There are three main failure modes of a voussoir beam structure: crushing in the high stress areas, buckling without localised material failure and shear sliding along the joints. Previous studies on the voussoir beam have concentrated on the crushing failure mode, assuming that the voussoir beam would not fail by shear sliding prior to reaching its crushing strength. However, the possibility exists that the voussoir beam may collapse by shear sliding along the joints with a strength much lower than that predicted by the estimation method for crushing failure, depending upon the joint properties. Hence the stability analysis of a jointed roof without considering the shear sliding failure may lead to disastrous consequences. In this paper a numerical and experimental study has been carried out to analyse the shear sliding failure of voussoir beams containing vertical and inclined joints with one or more mid joints. Equations for verification of shear sliding are proposed and effects of the voussoir beam geometry and material properties on the shear sliding failure are also discussed.

Keywords

Material Property Estimation Method Stability Analysis Failure Mode High Stress 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Beer, G., Meek, J. L. (1982): Design curves for roofs and hanging-walls in bedded rock based on ‘voussoir’ beam and plate solution. Trans. Inst. Min. Metall. 91, A18-A22.Google Scholar
  2. Brady, B. H. G., Brown, E. T. (1985): Rock mechanics for underground mining, Allen and Unwin, London, 209–222Google Scholar
  3. Chugh, A. K. (1977): Stability analysis of a jointed beam. Int. J. Numer. Anal. Methods in Geomech. 1, 323–341.Google Scholar
  4. Evans, W. H. (1941): The strength of undermined strata. Trans. Inst. Min. Metall. 50, 475–500.Google Scholar
  5. Goodman, R. E. (1976): Methods of geological engineering in discontinuous rocks, West Publishing Co., New York, 170–173.Google Scholar
  6. Goodman, R. E. (1989): Introduction to rock mechanics, 2nd ed. J. Wiley, New York, 233–237.Google Scholar
  7. Obert, L., Duvall, W. I. (1967): Rock mechanics and the design of structures in rock, J. Wiley, New York, 518–524.Google Scholar
  8. Passaris, E. K. S., Ran, J. Q., Mottahed, P. (1993): Stability analysis of the jointed roof in stratified rock. Pre-print Proc., 34th US Symp. on Rock Mech 2, 693–696.Google Scholar
  9. Pender, M. J. (1985): Prefailure joint dilatancy and the behaviour of a beam with vertical joints. Rock. Mech. Rock Engng. 18, 253–266.Google Scholar
  10. Potts, E. L. J., Szeki, A., Watson, S. H., Mottahed, P. (1979): The evaluation of the design criteria for an underground roof considered as a linear arch. In: Proc., 4th Congr. ISRM, Montreux, 2, 531–538.Google Scholar
  11. Ran, J. Q. (1993): Voussoir beam stability analysis for the jointed roof in stratified rock mass, Ph.D. thesis, University of Newcastle upon Tyne, UK.Google Scholar
  12. Sepehr, K., Stimpson, B. (1988). Roof deflection and sag in jointed, horizontally bedded strata — a numerical study. Rock Mech. Rock Engng. 21, 207–218.Google Scholar
  13. Sterling, R. L., Nelson, C. R. (1978): An experimental investigation of the ultimate strength of laterally constrained rock beams. Exper. Mech. 18, 261–268.Google Scholar
  14. Wright, F. D. (1972): Arching action in cracked roof beams. 5th Int. Strata Control Conf. paper 29.Google Scholar

Copyright information

© Springer-Verlag 1994

Authors and Affiliations

  • J. Q. Ran
    • 1
  • E. K. S. Passaris
    • 1
  • P. Mottahed
    • 2
  1. 1.Department of Civil EngineeringUniversity of Newcastle upon TyneNewcastle upon TyneUK
  2. 2.CANMET Elliot Lake LaboratoryCanada

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