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Experimental Investigation on Rockburst Energy Characteristics of True Triaxial Unloading in Sandstone Under High Stress

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Abstract

To explore the energy evolution characteristics of rockbursts and the mechanism of excess energy in rockbursts, a self-developed rockburst experimental system was used. We performed true triaxial rapid unloading rockburst simulations and triaxial experiments based on the complete stress-displacement surface (CSDS) model prediction of the post-peak curve of rock uniaxial compression. By analyzing the characteristics of stress–strain curve and energy evolution of the rockburst experiment and comparing the energy storage characteristics of the two experiments, we arrived at the following conclusions Unlike the static failure of rock due to uniaxial compression, the occurrence of rockburst is mainly due to the generation of excess energy, which depends on the elastic strain energy stored before rock failure, outside energy input after rock failure and residual elastic strain energy. The intermediate principal stress of the rockburst experiment stored considerable residual elastic strain energy after the rockburst, resulting in an insufficient release of the elastic strain energy stored before the rockburst. The intensity of the rockburst is closely related to its excess energy release rate (EERR). With an increase in the EERR value, the cumulative energy of acoustic emission (AE) during rockbursts, the fractal dimension of rockburst fragments, and the rockburst intensity gradually increase.

Highlights

  • The energy evolution and energy storage characteristics of true triaxial single-sided rapid-unloading rockburst experiment were studied using the graphic area method.

  • The excess energy mechanism of the rockburst was discussed by comparing the energy storage characteristics of the true triaxial rockburst experiment and the static failure of the uniaxial compression rock.

  • The correlation between rockburst intensity and EERR value was explored.

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Data availability

Data generated or analyzed during this study are available from the corresponding author upon reasonable request.

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Acknowledgements

Financial support from the National Natural Science Foundation of China (No. 52074299, No. 41941018) and the Fundamental Research Funds for the Central Universities (No. 2023JCCXSB02) are gratefully acknowledged.

Funding

National Natural Science Foundation of China, 52074299, Dongqiao Liu, 41941018, Manchao He, Fundamental Research Funds for the Central Universities, 2023JCCXSB02, Dongqiao Liu.

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Authors and Affiliations

  1. State Key Laboratory for Tunnel Engineering, China University of Mining and Technology, Beijing, 100083, China

    Jieyu Li, Dongqiao Liu, Manchao He & Yunpeng Guo

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  1. Jieyu Li
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  2. Dongqiao Liu
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  3. Manchao He
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  4. Yunpeng Guo
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Correspondence to Dongqiao Liu.

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Li, J., Liu, D., He, M. et al. Experimental Investigation on Rockburst Energy Characteristics of True Triaxial Unloading in Sandstone Under High Stress. Rock Mech Rock Eng (2024). https://doi.org/10.1007/s00603-024-03835-4

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