Numerical study on tunnel damage subject to blast-induced shock wave in jointed rock masses |
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| Affiliation: | 1. China Tiesiju Civil Engineering Group Company, LTD., Hefei 230023, China;2. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong;3. MOE Key Laboratory of Transportation Tunnel Engineering, Southwest Jiaotong University, Chengdu 610031, China;4. School of Civil and Environmental Engineering, Nanyang Technological University (NTU), Nanyang Avenue, Singapore 639798, Singapore;5. Defence Science and Technology Agency, 1 Depot Road # 03-01J, Singapore 109679, Singapore;6. Department of Civil Engineering, Monash University, Building 60, Clayton, Melbourne, VIC 3800, Australia;1. Islamic Azad University of Bushehr, Iran;2. Persian Gulf University, Bushehr, Iran;1. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China;2. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China;3. Department of Civil Engineering, Shanghai Jiaotong University, Shanghai 200030, China;4. State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China;5. Shanghai Pudong Project Development Co., Ltd, Shanghai 201210, China;1. School of Mechanics and Civil Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China;2. State Key Laboratory for Geomechanics and Deep Underground Engineering (Beijing), Beijing 100083, China |
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| Abstract: | In this study, numerical modeling on the damage of existing circular tunnel subject to blast-induced shock wave was carried out with DEM-based code UDEC. The disturbed zones including failure zones, open zones and shear zones around circular tunnel and peak particle velocities (PPVs) at tunnel surface are employed to analyze the damage of tunnel. The effects of joint spatial and mechanical properties, initial stress of rock mass, and magnitude of shock wave amplitude to damage of tunnel were evaluated in this study. The difference of damage between non-supported circular tunnel and bolt-supported circular tunnel subject to the same blast-induced shock wave was also studied. It is found that the orientations of joints in rock mass around the tunnel have great effects on tunnel damage. The initial stress around tunnel has relatively small influence on tunnel damage. The bolt support could greatly increase the stability of tunnel by changing the vibration form of particle velocity rather than the decreasing of PPV. |
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| Keywords: | Tunnel damage Disturbed zones Peak particle velocities Joints Initial stress Scaled distance Bolts |
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