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Deformation Field and Acoustic Emission Characteristics of Weakly Cemented Rock under Brazilian Splitting Test

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Abstract

Weakly cemented rocks are widely distributed in the Shendong Mining Area, and their mechanical properties and deformation characteristics have a significant influence on disaster prevention and the design of roadway excavation. This study investigated the evolution of the deformation field, acoustic emissions (AEs) and energy of four common weakly cemented rocks under Brazilian splitting test, and the relationship among the three parameters was discussed. The results show that the evolution of the coefficient of variation (Cv) in different rocks was similar and can be divided into two fast declining stages, a fluctuating rising stage and a sharply rising stage. There was a sudden increase in the cumulative AE energy before the peak strength was reached, which was positively correlated with the development of penetrating cracks. The evolution of Cv, growth rate of dissipated energy (Gd) and AE counts was consistent with the stress state, while there were some ‘non-corresponding points’ during the deformation and failure process. In addition, Cv, Gd and AE counts were more sensitive to deformation and failure characteristics than stress. The research findings provide basic parameters and a reference for predicting dynamic disasters in the Shendong Mining Area.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (Nos. U1910206, 51874312, 51861145403), State Key Research Development Program of China (2016YFC0801401) and Yue Qi Distinguished Scholar Project of China University of Mining & Technology (Beijing) (No. 2017JCB02). These sources of supports are gratefully acknowledged.

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  1. Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources, China University of Mining and Technology (Beijing), Beijing, 100083, China

    Yixin Zhao

  2. School of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing, 100083, China

    Yixin Zhao & Bin Liu

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  1. Yixin Zhao
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Correspondence to Yixin Zhao.

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Zhao, Y., Liu, B. Deformation Field and Acoustic Emission Characteristics of Weakly Cemented Rock under Brazilian Splitting Test. Nat Resour Res 30, 1925–1939 (2021). https://doi.org/10.1007/s11053-020-09809-x

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