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Crack evolution of soft-hard composite layered rock-like specimens with two fissures under uniaxial compression

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Abstract

Acoustic emission and digital image correlation were used to study the spatiotemporal evolution characteristics of crack extension of soft and hard composite laminated rock masses (SHCLRM) containing double fissures under uniaxial compression. The effects of different rock combination methods and prefabricated fissures with different orientations on mechanical properties and crack coalescence patterns were analyzed. The characteristics of the acoustic emission source location distribution, and frequency changes of the crack evolution process were also investigated. The test results show that the damage mode of SHCLRM is related to the combination mode of rock layers and the orientation of fractures. Hard layers predominantly produce tensile cracks; soft layers produce shear cracks. The first crack always sprouts at the tip or middle of prefabricated fractures in hard layers. The acoustic emission signal of SHCLRM with double fractures has clear stage characteristics, and the state of crack development can be inferred from this signal to provide early warning for rock fracture instability. This study can provide a reference for the assessment of the fracture development status between adjacent roadways in SHCLRM in underground mines, as well as in roadway layout and support.

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Acknowledgements

This study was supported by the Natural Science Foundation of Hubei Province (No. 2020CFB123) and the Scientific Research Program of Hubei Education Department (No. Q20201109). The authors are grateful for this financial support.

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Authors and Affiliations

  1. School of Resources and Environmental Engineering, Wuhan University of Science and Technology, Wuhan, 430081, China

    Dong Zhou, Yicheng Ye, Nanyan Hu & Weiqi Wang

  2. Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resources, Wuhan, 430081, China

    Yicheng Ye & Nanyan Hu

  3. Sinosteel Wuhan Safety and Environmental Protection Research Institute Co., Ltd., Wuhan, 430081, China

    Xianhua Wang

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  1. Dong Zhou
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Correspondence to Nanyan Hu.

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Zhou, D., Ye, Y., Hu, N. et al. Crack evolution of soft-hard composite layered rock-like specimens with two fissures under uniaxial compression. Front. Struct. Civ. Eng. 15, 1372–1389 (2021). https://doi.org/10.1007/s11709-021-0772-2

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