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Estimation of rock mass stability based on probability approach and rating systems

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Category: Geotechnical and mining mechanical engineering, machine building

Last Updated on 21 May 2017

Published on 21 May 2017

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Authors:

D.V.Babets, Cand. Sc. (Tech.), Assoc. Prof., State Higher Educational Institution “National Mining University”, Dnipro, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.; This email address is being protected from spambots. You need JavaScript enabled to view it.; This email address is being protected from spambots. You need JavaScript enabled to view it.; This email address is being protected from spambots. You need JavaScript enabled to view it.

О.О.Sdvyzhkova, Dr. Sc. (Tech.), Prof., State Higher Educational Institution “National Mining University”, Dnipro, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.; This email address is being protected from spambots. You need JavaScript enabled to view it.; This email address is being protected from spambots. You need JavaScript enabled to view it.; This email address is being protected from spambots. You need JavaScript enabled to view it.

M.H.Larionov, Cand. Sc. (Tech.), State Higher Educational Institution “National Mining University”, Dnipro, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.; This email address is being protected from spambots. You need JavaScript enabled to view it.; This email address is being protected from spambots. You need JavaScript enabled to view it.; This email address is being protected from spambots. You need JavaScript enabled to view it.

R.M.Tereshchuk, Cand. Sc. (Tech.), Assoc. Prof., State Higher Educational Institution “National Mining University”, Dnipro, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.; This email address is being protected from spambots. You need JavaScript enabled to view it.; This email address is being protected from spambots. You need JavaScript enabled to view it.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Abstract:

Methodology. Different types of rock mass classifications are analyzed and discussed. Advantages and disadvantages of rating systems are clarified to improve the system based on the structural factor. Statistical strength theory is used to determine the structural factor considering rock mass heterogeneity. A correspondence is set up between the structural factor and the factors reducing computed strength of rock mass obtained using Hoek-Brown’s and Palstrom’s approaches.

Findings. Quantitative comparison of the structural factors which approximate laboratory strength evaluation to real rock mass strength and are based on different approaches is carried out. This allowed comparing the different classifications of rocks and conducting geomechanical calculations using alternative methods. The correspondence between structural factor and geological strength index is specified. This provides a possibility of designing mining excavations using a good proven generalized Hoek-Brown strength criterion considering natural and technogenic disturbance of rocks.

Originality. For the first time the structural factor is represented as a piecewise monotonic function. The relationship between structural factor and Geological Strength Index and Rock Mass Index classifications for geomechanical calculations is established. The significant influence of discontinuities and the type of filler between joints on mechanical properties of a rock mass is shown. The need of considering the discontinuity surface conditions while structural factor defining is clarified.

Practical value. The relation between structural factor and Geological Strength Index allows creating the technique for application of GSI rating system and Hoek-Brown failure criterion in excavation design in terms of Ukrainian mines.

References

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