Abstract
It is well known that water inrush during excavation is one of the greatest challenges in modern underground engineering. However, the fracture propagation and inrush characteristics induced by excavation and high-pressure water are poorly understood due to the lack of an appropriate experimental apparatus and an online and real-time monitoring approach. Accordingly, a model test system for the simulation of water inrush during excavation and water injection was developed. Acoustic emission (AE) monitoring during excavation and injection was used to investigate the fracture propagation and water-inrush channel formation in the host rock. Three distinct stages were observed in the AEs over time and were related to the fracture propagation during excavation and injection, namely fracture initiation, fracture extension, and unstable fracture growth (fracture network). The AE results exhibited an increase in AE activities and changes in the AE spatial correlation during the excavation and during the increase in injection pressure. A comparison of photographs of the water-inrush locations and the mechanical characteristics obtained from the AE test verified the proposed method. The results provide valuable insights and a suitable method for the investigation of the mechanism of water inrush in underground engineering.
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Acknowledgements
The authors gratefully acknowledge the financial support from the National Natural Science Foundation of China (41702326), the National Postdoctoral Program for Innovative Talents (BX201700113), the China Postdoctoral Science Foundation (2017M620205), the Natural Science Foundation of Jiangxi Province (20171BAB206022), the State Key Laboratory for GeoMechanics and Deep Underground Engineering, China University of Mining and Technology (SKLGDUEK1703), the Technology Project Founded by the Education Department of Jiangxi Province (GJJ160675), and the Innovative Experts, Long-term Program of Jiangxi Province. We thank Prof. Vladimír Schenk (Editor in Chief) and two referees for their very constructive reviews.
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Huang, Z., Zeng, W., Wu, Y. et al. Experimental investigation of fracture propagation and inrush characteristics in tunnel construction. Nat Hazards 97, 193–210 (2019). https://doi.org/10.1007/s11069-019-03634-z
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DOI: https://doi.org/10.1007/s11069-019-03634-z