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Effect of high temperature on the brittleness index of granite: an experimental investigation

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Abstract

Brittle index evolution is an important property of rocks in the context of mining engineering, as it often determines how severe the practical consequences of rock burst will be. However, the lack of knowledge of temperature and press on the brittleness index of hard rocks limits the further development of deep earth engineering. When fire breaks out in a deep underground rock project, the physical properties of the rock will change significantly, and the tunnel and pillars may be destroyed. The cylinder specimens were prepared, and uniaxial compression (UC) and single-cyclic loading–unloading uniaxial compression (SCLUC) tests were conducted on the thermal treated granite samples. This paper presents a new brittleness index based on the elastic strain energy evolution. The test results demonstrated that an increase in temperature results in obvious brittleness characteristics decrease of granite and rock burst proneness decrease with the increase. Meanwhile, it is found that the elastic strain energy density increases linearly with the total input strain energy density in the pre-peak curves with different temperature, confirming that the linear accumulate energy has not been altered by temperature. According to this inherent property, the peak elastic strain energy of granites after different temperature can be calculated accurately. On this basic, the relationship between temperature and energy evolution of granite was discussed, revealing that high temperature cause the energy dissipation, which is essential for reducing the rock brittleness. This study provides some new insights into the rock brittleness evaluation in high depth and high temperature rock engineering.

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Abbreviations

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

Uniaxial compressive strength

\({\sigma }_{f}\) :

Failure point strength

E :

Elastic modulus

\({E}_{f}\) :

Failure point elastic modulus

P :

Wave velocity

T :

Temperature

k :

Setting unloading stress level

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

Peak strain

\({\varepsilon }_{d}\) :

Unloading strain

\({\varepsilon }_{u}\) :

Peak point unloading strain

\({\varepsilon }_{f}\) :

Failure point strain

\({W}_{ET}\) :

Energy accumulation coefficient in pre-peak

\({W}_{DT}\) :

Energy dissipated coefficient in pre-peak

\({A}_{EF}\) :

Residual elastic energy density proposed by Gong et al.

\({BI}_{e}\) :

Brittleness index

\({u}_{t}^{p}\) :

Peak total input strain energy density

\({u}_{e}^{p}\) :

Peak elastic strain energy density

\({u}_{d}^{p}\) :

Peak dissipated strain energy density

\({u}_{t}\) :

Total input strain energy density

\({u}_{d}\) :

Dissipated strain energy density

\({u}_{e}\) :

Elastic strain energy density

\({u}_{r}\) :

Residual elastic energy density proposed by authors

\({U}_{t}\) :

Testing machine input energy in post-peak

A:

The first degree coefficient of linear fitting

B:

Constant term of linear fitting

\({R}^{2}\) :

Coefficient of linear fitting determination

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Funding

This work was supported in part by the National Natural Science Foundation of China under Grant 41972283 and the National Natural Science Foundation of China under Grant 51774325.

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Authors and Affiliations

  1. School of Resources and Safety Engineering, Central South University, Changsha, 410083, China

    Tubing Yin, Jiexin Ma, You Wu, DengDeng Zhuang & Zheng Yang

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  1. Tubing Yin
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  2. Jiexin Ma
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  3. You Wu
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  4. DengDeng Zhuang
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  5. Zheng Yang
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Corresponding author

Correspondence to Tubing Yin.

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Conflict of interest

We would like to declare that the work described is original research that has not been published previously and is not under consideration for publication elsewhere, in whole or in part. We declare that we do not have any commercial or associative interest that represents a conflict of interest in connection with the work submitted. The manuscript is approved by all authors for publication.

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Yin, T., Ma, J., Wu, Y. et al. Effect of high temperature on the brittleness index of granite: an experimental investigation. Bull Eng Geol Environ 81, 476 (2022). https://doi.org/10.1007/s10064-022-02953-z

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  • DOI: https://doi.org/10.1007/s10064-022-02953-z

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