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Effect of Open-Fire-Induced Damage on Brazilian Tensile Strength and Microstructure of Granite

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Abstract

Deformation and stability of surrounding rock of a tunnel could be significantly affected by the fire accident-induced open-fire damage. In this study, the influence of open-fire damage on the P-wave velocity, Brazilian tensile strength (BTS), and the associated microstructure evolution of granite is investigated. The open-fire damage is generated by heating the rock sample with charcoal fire for 3 h prior to the subsequent tests. P-wave velocity of intact and heated specimens is measured. The microstructure of specimens with different distances to the open fire is observed utilizing a polarizing microscopy. Brazilian splitting tests on the heated specimens are then conducted combined with high-speed camera for monitoring the failure process. Both P-wave velocity and BTS are found to increase rapidly as the distance from the specimen to the open fire increases. When the distance between the specimen and the open fire is larger than 125 mm, the values of P-wave velocity and BTS tend to level off at the values of unheated specimen. The degradation of P-wave velocity and BTS with increasing open-fire damage is mainly attributed to the induced microcracks in the process of approaching the open fire. The trans-granular microcracking is found to be an effective indicator to evaluate the degree of open-fire damage. Two negative exponential models are proposed for the variation of the P-wave velocity and BTS with the damage distance from the specimen to the open fire. The proposed model is validated by the reasonable agreement between model predictions and experimental results.

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Abbreviations

\(\sigma_{\text{t}}\) :

Brazilian tensile strength

P :

Failure load

D :

Diameter of disk specimen

t :

Thickness of disk specimen

V p :

Predicted value of P-wave velocity

V pi :

Initial value of P-wave velocity

V pm :

Maximum increment of P-wave velocity

T :

Predicted value of Brazilian tensile strength

T i :

Initial value of Brazilian tensile strength

T m :

Maximum increment of Brazilian tensile strength

d :

Distance from the rock specimen to the open fire

n :

Model parameter

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Acknowledgements

The research work presented in this paper is in part supported by the National Natural Science Foundation of China (Grant nos. 41772305, 51609178, and 51579189), the Nature Science Foundation of Hubei Province (Grant no. 2018CFB593), and the China Postdoctoral Science Foundation (Grant nos. 2015M582273 and 2018T110800). The authors are grateful to these financial supports.

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Authors and Affiliations

  1. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan, 430072, China

    Song Sha, Guan Rong, Jun Peng, Bowen Li & Zhijun Wu

  2. Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering, Ministry of Education, Wuhan University, Wuhan, 430072, China

    Song Sha, Guan Rong, Jun Peng & Bowen Li

  3. School of Civil Engineering, Wuhan University, Wuhan, 430072, China

    Zhijun Wu

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  1. Song Sha
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Correspondence to Guan Rong or Jun Peng.

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Sha, S., Rong, G., Peng, J. et al. Effect of Open-Fire-Induced Damage on Brazilian Tensile Strength and Microstructure of Granite. Rock Mech Rock Eng 52, 4189–4202 (2019). https://doi.org/10.1007/s00603-019-01871-z

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