Experimental investigation on failure process and spatio-temporal evolution of rockburst in granite with a prefabricated
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Experimental investigation on failure process and spatio-temporal evolution of rockburst in granite with a prefabricated circular hole LIU Chong-yan(刘崇岩)1, 2, ZHAO Guang-ming(赵光明)1, 2, XU Wen-song(许文松)1, 2, MENG Xiang-rui(孟祥瑞)1, 2, HUANG Shun-jie(黄顺杰)1, 2, ZHOU Jun(周俊)1, 2, WANG Yun-kun(王云鲲)3 1. State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, Anhui University of Science and Technology, Huainan 232001, China; 2. School of Mining and Safety Engineering, Anhui University of Science and Technology, Huainan 232001, China; 3. Department of Civil & Mineral Engineering, University of Toronto, Ontario, M5S 1A4, Canada © Central South University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020 Abstract: To study the mechanism of rockburst and its spatio-temporal evolution criterion, a rockburst simulation experiment was performed on granite specimens, each with a prefabricated circular hole, under different lateral loads. Using micro camera, acoustic emission (AE) system, and infrared thermal imager, the AE characteristics and thermal radiation temperature migration were studied during the rockburst process. Then, the failure mode and damage evolution of the surrounding rock were analyzed. The results demonstrate that increasing the lateral load can first increase and then reduce the bearing capacity of the hole. In this experiment, the hole failure process could be divided into four periods: quiet, particle ejection, stability failure and collapse. Correspondingly, the AE signals evolved from a calm stage, to have intermittent appearance; then, they were continuous with a sudden increase, and finally increased dramatically. The failure of the surrounding rock was mainly tensile failure, while shear failure tended to first increase and then decrease. Meanwhile, damage to the hole increased gradually during the particle ejection period, whereas damage to the rockburst mainly occurred in the stability failure period. The thermal radiation temperature migration exhibited warming in shallow parts, inward expansion, cooling in the shallow parts with free surface heating, inward expansion, a sudden rise in temperature of the rockburst pits, and finally specimen failure. The initial reinforcement support should fully contribute to surface support. Furthermore, an appropriate tensile capacity and good energy absorption capacity should be established in support systems for high-stress roadways. Key words: rockburst; acoustic emission; spatio-temporal evolution; thermal imaging Cite this article as: LIU Chong-yan, ZHAO Guang-ming, XU Wen-song, MENG Xiang-rui, HUANG Shun-jie, ZHOU Jun, WANG Yun-kun. Experimental investigation on failure process and spatio-temporal evolution of rockburst in granite with a prefabricated circular hole [J]. Journal of Central South University, 2020, 27(10): 2930−294. DOI: https://doi.org/10.1007/s11771-020-4519-3.
1 Introduction When a deep high-stress roadway is unloaded
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