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Mechanical response and AE characteristics of heterogeneous rock under dynamic compression tests based on moment tensor analysis

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Abstract

Rock heterogeneity significantly influences a rock mass's dynamic mechanical behavior and fracture evolution. This study focused on creating heterogeneous sandstone models using the discrete element method and conducting split-Hopkinson pressure bar tests. The results show that heterogeneity has a significant impact on the dynamic mechanical properties of rock. The dynamic compressive strength, elastic modulus, and heterogeneity coefficient exhibit a negative correlation. The weakening effect of heterogeneity on rock strength is greater than its effect on stiffness. Increasing heterogeneity leads to a decrease in strain and kinetic energy at the peak stress point, while friction energy initially decreases and then increases. Rock heterogeneity reduces impact resistance and the occurrence of rock bursts. Moreover, heterogeneity rocks exhibit significant strain rate effects. Acoustic emission (AE) moment tensor analysis reveals that under impact load, tensile or shear fractures are the main sources of failure in heterogeneous rock samples. With increased heterogeneity, tensile fractures gradually transform into compression fractures, while shear fractures slowly increase. Shear fractures have relatively high strength compared to other AE types. The characteristics of acoustic emissions in rock samples follow a roughly normal distribution, and the b value of AE gradually increases with higher heterogeneity. These findings provide valuable insights into the dynamic mechanical response and fracture mechanism of rocks and have practical applications in engineering design and rock disaster prediction.

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Acknowledgements

Financial supports from the National Natural Science Foundation of China (No. 52074260); Fundamental Research Funds for the Central Universities of China (No. 2019QNA26).

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Authors and Affiliations

  1. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, 221116, Jiangsu, China

    Guotao Yuan, Mingwei Zhang, Kai Zhang & Zhuangcai Tian

  2. College of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou, 221116, Jiangsu, China

    Mingwei Zhang, Kai Zhang, Zhuangcai Tian, Hongyue Duan & Baolin Liu

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GY did conceptualization, methodology, investigation, data curation, validation, formal analysis, and writing. MZ done conceptualization, methodology, writing, and supervision. KZ was involved in methodology, investigation, and data curation. Zhuangcai Tian supervised and validated the study. HD done methodology and investigation. BL investigated the study.

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Yuan, G., Zhang, M., Zhang, K. et al. Mechanical response and AE characteristics of heterogeneous rock under dynamic compression tests based on moment tensor analysis. Comp. Part. Mech. 11, 815–838 (2024). https://doi.org/10.1007/s40571-023-00655-1

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