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A New Rock Brittleness Evaluation Index Based on the Internal Friction Angle and Class I Stress–Strain Curve

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Abbreviations

\({B_i}\) :

Brittleness index

\({\sigma _{\text{p}}}\) :

Peak strength

\({\sigma _{\text{r}}}\) :

Residual strength

E :

Elasticity modulus

M :

Post-peak modulus

\({\varepsilon _{\text{p}}}\) :

Peak strain

\({\varepsilon _{\text{r}}}\) :

Residual strain

\({k_1}\) :

Ratio of the elasticity modulus to the post-peak modulus

\({k_2}\) :

Ratio of the post-peak stress drop to the peak stress

\(\rho\) :

Density

\(\upsilon\) :

Poisson ratio

\({\sigma _{\text{t}}}\) :

Tensile strength

\({\sigma _{\text{c}}}\) :

Uniaxial compression strength

\({\sigma _1}\) :

Major principal stress

\({\sigma _3}\) :

Confining pressure

m :

Material constant for a specific rock in the Hoek–Brown criterion

s :

Material constant for a specific rock in the Hoek–Brown criterion

\(\varphi\) :

Internal friction angle

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Acknowledgements

This work is supported by the National Program on Key Basic Research Project of China (2014CB046902) and the National Natural Science Foundation of China (51427803 and 51404240). Partial support from the Youth Innovation Promotion Association CAS is gratefully acknowledged. The authors are also grateful to the journal editor and the reviewers for their insightful comments and suggestions for this paper.

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Authors and Affiliations

  1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, China

    Hui Zhou, Jun Chen, Jingjing Lu & Yue Jiang

  2. University of Chinese Academy of Sciences, Beijing, 100049, China

    Hui Zhou, Jun Chen, Jingjing Lu & Yue Jiang

  3. College of Science, Qingdao University of Technology, Qingdao, 266033, Shandong, China

    Fanzhen Meng

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  1. Hui Zhou
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  2. Jun Chen
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  3. Jingjing Lu
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Correspondence to Jun Chen.

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Zhou, H., Chen, J., Lu, J. et al. A New Rock Brittleness Evaluation Index Based on the Internal Friction Angle and Class I Stress–Strain Curve. Rock Mech Rock Eng 51, 2309–2316 (2018). https://doi.org/10.1007/s00603-018-1487-0

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