Abstract
The constant mi is a fundamental parameter required in the Hoek–Brown (H–B) failure criterion for estimating rock strength. Triaxial tests for the calculation of this constant are time-consuming and expensive. In this paper, a new perspective is presented for the physical meaning of the parameter mi of the H–B model in consideration of the contact friction coefficient. A correlation between the contact friction coefficient and mi is established using published data. A practical approach is proposed to determine the value of the parameter mi. In addition, previously proposed methods of estimating the residual strength of rock are reviewed. A novel method based on the H–B failure criterion is established to predict the residual strength of rock. The single model parameter used in the new model controls the residual strength nonlinearity. The strengths predicted by the proposed method for limestone, granite, slate, and sandstone are in good agreement with those measured during laboratory tests. The corresponding errors are within a range of 15%. This method is applied to an actual rock mass around a tunnel in the Hanjiang to Weihe River Project of China.
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Abbreviations
- σ 1 :
-
Major minor principal stresses
- σ 3 :
-
Minor principal stresses
- UCS:
-
Unconfined compressive strength of intact rock
- m i :
-
Material constant for intact rock
- \(\kappa\) :
-
Coefficient for mixed mode fracture
- \(\left| {\sigma_{t} } \right|\) :
-
Uniaxial tensile strength
- F n :
-
Thrust force
- F t :
-
Torque force
- θ :
-
Contact friction angle between fractured rock faces
- H :
-
Slope of Ft–Fn linear curve
- a :
-
Rake angle of bit (geometric parameter of bit)
- \(\varphi^{\prime}\) :
-
Friction angle between the intact rock and rock clastic
- \(\varphi\) :
-
Internal friction angle
- \(\mu\) :
-
Friction coefficient
- \(\phi\) :
-
Crack surface friction angle
- σ r :
-
Rock residual strength
- σ cr :
-
Residual strength at the confining pressure of zero
- b :
-
Dimensionless parameter
- GSIr and mir :
-
Two model parameters in the GSI-softening model
- λ, η and γ :
-
Dimensionless parameter
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Acknowledgements
This study is sponsored by the National Natural Science Foundation of China (Grants nos. 11902249, 11872301 and 51779207) and the Natural Science Basic Research Plan in Shaanxi Province of China (Grant nos. 2019JQ395 and 17JS091). The financial support provided by this sponsor is greatly appreciated.
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He, M., Zhang, Z., Zheng, J. et al. A New Perspective on the Constant mi of the Hoek–Brown Failure Criterion and a New Model for Determining the Residual Strength of Rock. Rock Mech Rock Eng 53, 3953–3967 (2020). https://doi.org/10.1007/s00603-020-02164-6
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DOI: https://doi.org/10.1007/s00603-020-02164-6