Abstract
To investigate the influence of a small-scale single structural plane with hard fillings in the surrounding rock of deep tunnels on the rockburst process, a series of biaxial compression tests were conducted on granite specimens (200 mm × 200 mm × 30 mm) with a circular hole of 50 mm in diameter. The characteristics of the rockburst process, acoustic emission (AE) and the corresponding energy release characteristics under different conditions of the structural plane (existence or not, exposure or not and inclination angle) were investigated. The test results show that the existence of the structural plane significantly influences the evolution characteristics of rockburst, such as the occurrence time and severity of the rockburst, the AE, and the energy release. The exposure condition of the structural plane also has a significant impact on the occurrence of the rockburst. Compared with the condition of the exposed structural plane, the unexposed structural plane can promote the occurrence of the rockburst, resulting in larger AE characteristic parameters and energy release. The inclination angle of the unexposed structural plane has a certain influence on the failure mode and intensity of the rockburst. The rock specimens containing unexposed structural planes with inclination angles of 30°, 45° and 60° are prone to shear failure and exhibit violent rockburst, while the rock specimens containing unexposed structural planes with inclination angles of 0° and 90° are prone to slabbing failure and exhibit relatively slight rockburst. In addition, the energy release increases first and then decreases as the inclination angle of the unexposed structural plane increases, while the inclination angle of the exposed structural plane has no apparent influence on the energy release. The results of this study can enhance the understanding of the influence mechanism of a small-scale structural plane on the rockburst in deep underground engineering.
Highlights
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The physical simulation tests of the rockburst process of surrounding rocks with a small-scale structural plane near the excavated boundary in deep tunnels were successfully carried out.
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The existence of a small-scale single structural plane with hard fillings significantly changed the development process of rockbursts in deep tunnels.
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The unexposed structural plane near the excavated boundary can promote the occurrence of rockburst, while the structural plane exposed to the free face will suppress it.
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The authors confirm they have included a data availability statement in their main manuscript file. The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
The authors greatly gratefully acknowledge the financial support from the National Natural Science Foundation of China (Grant Nos. 51869003, 52169021 and 11972149), the High Level Innovation Team and Outstanding Scholar Program of Universities in Guangxi Province (Grant No. 202006) and the Interdisciplinary Scientific Research Foundation of Guangxi University (Grant No. 2022JCA004). The work in this paper was also supported by the Guangxi Natural Science Foundation (Grant No. 2021GXNSFBA075030) and the Guangxi Science and Technology Project (Grant No. Guike AD20325002).
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Guoshao Su made substantial contributions to the design of the work. Xiaoyang Yan conducted the processing and interpretation of data and wrote the manuscript. Zhi Zheng wrote and revised the manuscript. Chongjin Li provides suggestions in the revision of the manuscript; Xingguang Zhao helped to revised the manuscript. Hongyu Ren carried on the experiments.
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Su, G., Yan, X., Zheng, Z. et al. Experimental Study on the Influence of a Small-Scale Single Structural Plane on Rockburst in Deep Tunnels. Rock Mech Rock Eng 56, 669–701 (2023). https://doi.org/10.1007/s00603-022-03062-9
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DOI: https://doi.org/10.1007/s00603-022-03062-9