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Vol 239
Pages:
502
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Estimation of Rock Mass Strength in Open-Pit Mining

Authors:
A. A. Pavlovich1
V. A. Korshunov2
A. A. Bazhukov3
N. Ya. Melnikov4
About authors
  • 1 — Saint-Petersburg Mining University
  • 2 — Saint-Petersburg Mining University
  • 3 — Saint-Petersburg Mining University
  • 4 — Saint-Petersburg Mining University
Date submitted:
2019-04-27
Date accepted:
2019-07-10
Date published:
2019-10-27

Abstract

The paper presents results of an experimental study on strength characteristics of the rock mass as applied to   the assessment of open-pit slope stability. Formulas have been obtained that describe a correlation between ultimate and residual strength of rock samples and residual shear strength along the weakening surface. A new method has been developed to calculate residual interface strength of the rock mass basing on data from the examination of small-scale monolith samples with opposing spherical indentors. A method has been proposed to estimate strength characteristics (structural weakening coefficients and internal friction angles) of the fractured near-slope rock mass. The method relies on test data from shattering small-scale monolith samples with spherical indentors, taking into ac- count contact conditions along the weakening surface, and can be applied in the field conditions. It is acceptable to use irregular-shaped samples in thetests.

10.31897/pmi.2019.5.502
Go to volume 239

References

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  2. Methodical Guidelines on Estimation of Inclination Angles for Edges, High-Walls and Dump Slopes of Open-Pit Mines under Construction and Exploitation. VNIMI. Leningrad, 1972, p. 165 (in Russian).
  3. Regulations on Ensuring Slope Stability in the Open-Pit Coal Mines. VNIMI. St. Petersburg, 1998, p. 208 (in Russian).
  4. Protosenya A.G., Verbilo P.E Estimation of Scale Effect in Strength Characteristics of the Fractured Rock Mass. Izvestiya TulGU. Nauki o Zemle. 2016. Iss. 1, p. 167-176 (in Russian).
  5. Fisenko G.L. Slope Stability of Open-Pit Mines and Dumps. Мoscow: Nedra,1965, p. 373 (in Russian).
  6. Barton N. A relationship between joint roughness and joint shear strength. Rock fracture: In Proceedings of International Symposium on Rock Fracture. Nancy. 1971, p. 1-8.
  7. Bandis S., Lumsden A., Barton N. Experimental studies on scale effects on the shear behaviour of rock joints. International Journal of Rock Mechanics and Mining Science and Geomechanics. 1981, p. 1-21.
  8. Barton N. Shear strength investigations for surface mining. In Stability in Surface Mining: Proceedings of 3rd International Conference. Vancouver, British Columbia. 1982, p. 171-196.
  9. Pavlovich A.A., Korshunov V.A., Tsirel S.V., Melnikov N.Ya., Bazhukov A.A. Geomechanical substantiation of calculate indentors of the rock mass strength for slopes stability analysis of open pit. Geomechanics and Geodynamics of Rock Masses: Proceedings of the European Rock Mechanics Symposium (Eurock 2018, Saint-Petersburg, Russia, 22-26 May 2018). London: Taylor and Francis Group. UK. 2018. Vol. 2, p. 1053-1058.
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  11. Korshunov V.A., Solomoichenko D.A., Bazhukov A.A. Strength estimation of fractured rock using compression a speci- men with spherical indenters. Geomechanics and Geodynamics of Rock Masses: Proceedings of the European Rock Mechanics Symposium (Eurock 2018, Saint-Petersburg, Russia, 22-26 May 2018). London: Taylor and Francis Group. UK. 2018. Vol. 1, p. 299-305.
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