(1. School of Civil Engineering，Southeast University，Nanjing，Jiangsu 211189，China；2. Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization，Shenzhen University，Shenzhen，Guangdong 518060，China；3. School of Civil and Surveying Engineering，Jiangxi University of Science and Technology，Ganzhou，Jiangxi 341000，China；4. Oulu Mining School，University of Oulu，Oulu 90570，Finland)
Abstract：The occurrence of rockburst in deep tunnels is closely related to impact disturbances，and the tunnel cross-sectional shape further affects the process and characteristics of rockburst. Based on the world?s first biaxial split-Hopkinson pressure bar apparatus，the two-dimensional high-stress tunnel sidewall failure test function under impact loading conditions was developed. Rockburst tests were conducted on specimens with circular hole，D-shaped hole and rectangular hole，all subjected to same coupling of static stress and impact load，to explore the influence of cross-sectional shape on tunnel rockburst. The high-speed camera and DIC were used to unveil the rockburst process and strain field evolution of the specimens. The test results indicate that the rockburst process for specimens with different cross-sectional shapes can be summarized into four stages：the calm stage；crack initiation，propagation，penetration stage；spalling stage and rock fragment ejection stage. There are significant differences in the rockburst characteristics among specimens with different cross-sectional shapes. In circular hole specimens，the strain concentration zone is located at the centerline of the hole，and cracks transition from arc to “V” shape，resulting in the least severe rockburst and a tensile failure mode in the surrounding rock. D-shaped hole specimens have strain concentration zones in the straight wall area between the arch foot and shoulder，with cracks transitioning from arc to“V”shape，primarily demonstrating tensile and tensile-shear failure modes. Rectangular hole specimens experience the most severe rockburst，with a strain concentration zone spanning the entire sidewall，and cracks transitioning from straight line to“V”shape，also primarily demonstrating tensile and tensile-shear failure modes. Rectangular hole specimens show the highest overall deformation rate with a maximum strain value of 0.003 4，followed by D-shaped specimens with a maximum strain value of 0.002 9，and circular hole specimens show relatively lowest deformation rate with a maximum strain value of 0.002 2. Comparative results suggest that circular hole sections can optimize stress or strain distribution，improve the overall structural stability of tunnels，and result in lower severity of rockburst. D-shaped and rectangular hole sections may experience stress concentration due to their irregular shapes，making them relatively more susceptible to damage and resulting in a higher severity of rockburst.
伍武星1，宫凤强1，2，3，高明忠2，ZHANG Zongxian4. 冲击扰动下断面形状对深部隧洞岩爆的影响研究[J]. 岩石力学与工程学报, 2024, 43(9): 2257-2272.
WU Wuxing1，GONG Fengqiang1，2，3，GAO Mingzhong2，ZHANG Zongxian4. Study on the influence of cross-section shape on rockburst of deep#br#
tunnels under impact disturbance. , 2024, 43(9): 2257-2272.
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2024, Vol. 43 
