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Effects of Thermal Damage on Strain Burst Mechanism for Brittle Rocks Under True-Triaxial Loading Conditions

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Abstract

Strain burst is a common problem encountered in brittle rocks in deep, high-stress mining applications. Limited research focuses on the effects of temperature on the strain burst mechanism and the kinetic energies of rocks. This study aims to investigate the effects of thermal damage on the strain burst characteristics of brittle rocks under true-triaxial loading-unloading conditions using the acoustic emission (AE) and kinetic energy analyses. The time-domain and frequency-domain responses related to strain burst were studied, and the damage evolution was quantified by b-values, cumulative AE energy and events rates. The ejection velocities of the rock fragments from the free face of the granite specimens were used to calculate kinetic energies. The experimental results showed that thermal damage resulted in a delay in bursting but increased the bursting rate at ~ 95% of normalised stress level. This is believed to be due to the micro-cracks induced by temperature exposure, and thus the accumulated AE energy (also supported by cumulative AE counts) at the initial loading stage was reduced, causing a delay in bursting. The strain burst stress, initial rock fragment ejection velocity, and kinetic energy decreased from room temperature (25 °C) to 100 °C, whereas they resulted in a gradual rise from 100 to 150 °C demonstrating more intense strain burst behaviour.

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Acknowledgements

The authors gratefully acknowledge the financial support from the Australian Research Council (ARC-LP150100539), OZ Minerals and the principal geotechnical manager, David Goodchild. The authors also thank Adam Ryntjes for his valuable help in the specimen preparation. Leticia Mooney is acknowledged for her English editing.

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Authors and Affiliations

  1. School of Civil, Environmental and Mining Engineering, The University of Adelaide, Adelaide, SA, Australia

    Selahattin Akdag, Murat Karakus, Abbas Taheri & Giang Nguyen

  2. State Key Laboratory for GeoMechanics and Deep Underground Engineering, Beijing, 100083, China

    He Manchao

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  1. Selahattin Akdag
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  2. Murat Karakus
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  3. Abbas Taheri
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  4. Giang Nguyen
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  5. He Manchao
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Correspondence to Murat Karakus.

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Akdag, S., Karakus, M., Taheri, A. et al. Effects of Thermal Damage on Strain Burst Mechanism for Brittle Rocks Under True-Triaxial Loading Conditions. Rock Mech Rock Eng 51, 1657–1682 (2018). https://doi.org/10.1007/s00603-018-1415-3

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  • DOI: https://doi.org/10.1007/s00603-018-1415-3

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