Skip to main content
SpringerLink
Log in

Influence of width/height ratio on post-failure behaviour of coal

  • Short Communication
  • Published:
International Journal of Mining and Geological Engineering Aims and scope Submit manuscript

Conclusions

The post-failure slope immediately after strength failure decreases on the negative side with the increase inw/h ratio. Atw/h equal to around 10 or 11 this slope becomes almost zero and then again the slope increases but on the positive side with further increase inw/h ratio.

At loww/h ratios, the post-failure characteristic touches the abscissa ultimately. Forw/h greater than 4 or 6 after an initial fall, the broken mass starts reconsolidation on further loading due to high lateral constraints provided at the centre and the curve starts rising again. Forw/h ratios greater than 10 or 11, there is no loss in the post-failure strength.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

References

  • Brown, E.T. and Hudson, J.A. (1971) The influence of microstructure on rock fracture on the laboratory scale. In rock fractures,Proceedings of the Symposium on Rock Fracture. Nancy, pp. 11–20.

  • Houpert, R. (1970) The uniaxial compressive strength of rocks,Proceedings of 2nd Congress of the International Society for Rock Mechanics. Belgrade, 2, pp. 49–55.

  • Houpert, R. (1979) The fracture behaviour of rocks,Proceedings of the 4th Congress of the International Society for Rock Mechanics, Montreux, 3, Balkema, Rotterdam, pp. 107–114.

  • Hudson, J.A., Brown, E.T. and Fairhurst, C. (1971) Shape of the complete stress-strain curve for rock. In stability of rock slopes.Proceedings of the 13th Symposium on Rock Mechanics, Urbana, ASCE, Illinois, pp. 773–795.

    Google Scholar 

  • Hudson, J.A., Crouch, S.L. and Fairhurst, C. (1972) Soft, stiff and servo-controlled testing machines. A review with reference to rock failure,Engineering Geology 6 155–189.

    Google Scholar 

  • Peng, S.S. and Johnson, A.M. (1972) Crack growth and faulting in cylindrical specimens of Chelmsford granite,International Journal of Rock Mechanics and Mining Sciences 9 37–86.

    Google Scholar 

  • Peng, S.S. and Ortiz, C.A. (1972) Crack propagation and fracture of rock specimens loaded in compression. In SIH G.C.,Dynamic crack propagation, International Conference, Lehigh University, Bethlehem, Noordhoff International Publisher, pp. 113–129.

  • Rummel, F. (1971) Uniaxial compression tests on right angular rock specimens with central holes,Proceedings of the Symposium on Rock Fracture, NancyII pp. 90–101.

    Google Scholar 

  • Rummel, F. and Fairhurst, G. (1970) Determination of the post-failure behaviour of brittle rock using a servo-controlled testing machine,Rock Mechanics 2 189–204.

    Google Scholar 

  • Sangha, C.M., Talbot, C.J. and Dhir, R,K, (1974) Microfracturing of a sandstone in uniaxial compression,International Journal of Rock Mechanics and Mining Sciences 11 107–113.

    Google Scholar 

  • Van Heerden, W.L. (1975)In situ complete stress-strain characteristics of large coal specimens,Journal of South African Institute of Mining and Metallurgy 75 207–217.

    Google Scholar 

Download references

Author information

Authors and Affiliations

  1. Central Mining Research Station, Barwa Road, 826001, Dhanbad, Bihar, India

    M. N. Das

Authors
  1. M. N. Das
    View author publications

    You can also search for this author in PubMed Google Scholar

Rights and permissions

Reprints and permissions

About this article

Cite this article

Das, M.N. Influence of width/height ratio on post-failure behaviour of coal. International Journal of Mining and Geological Engineering 4, 79–87 (1986). https://doi.org/10.1007/BF01553759

Download citation

  • Received:

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF01553759

Keywords

Search

Navigation