Simulation of cracking near a large underground cavern in a discontinuous rock mass using the expanded distinct element method |
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| Authors: | Yujing Jiang Bo Li Yuji Yamashita |
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| Affiliation: | 1. Faculty of Engineering, Nagasaki University, Nagasaki 852-8521, Japan;2. Research Center for Geo-Environmental Science, Dalian University, Dalian 116622, China;3. Graduate School of Science and Technology, Nagasaki University, Nagasaki 852-8521, Japan;4. Kyushu Electric Power Co., Inc., Fukuoka 815-8521, Japan;1. Key Laboratory of Gas and Fire Control for Coal Mines (China University of Mining and Technology), Ministry of Education, Xuzhou, 221116, China;2. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou, Jiangsu, 221116, China;3. School of Safety Engineering, China University of Mining and Technology, Xuzhou, Jiangsu, 221116, China;4. Department of Mining Engineering, Balochistan University of Information Technology, Engineering and Management Sciences, Quetta, Pakistan;5. College of Safety Science and Engineering, Xi''an University of Science and Technology, Xi An, Shaanxi, 710054, China;1. School of Highway, Chang’an University, Xi’an 710064, China;2. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China;3. Key Laboratory of Bridge Engineering Safety Control by Hunan Province, Department of Education, Changsha University of Science & Technology, Changsha 410114, China;4. School of Resources and Safety Engineering, Central South University, Changsha 410083, China;5. Department of Civil Engineering, Zhejiang University, Hangzhou 310058, China;1. Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines, College of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China;2. GeoEngineering Centre at Queen’s – RMC, Queen’s University, Kingston, ON K7L 3N6, Canada;1. Graduate School of Engineering, Nagasaki University, 1-14 Bunkyo-machi, 8528521 Nagasaki, Japan;2. School of Engineering, Nagasaki University, 1-14 Bunkyo-machi, 8528521 Nagasaki, Japan;3. State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266510, PR China;1. State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China;2. School of Engineering and ICT, The University of Tasmania, Hobart TAS7001, Australia;3. Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, China;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 |
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| Abstract: | The rock masses in a construction site of underground cavern are generally not continuous, due to the presence of discontinuities, such as bedding, joints, faults and fractures. The performance of an underground cavern is principally ruled by the mechanical behaviors of the discontinuities in the vicinity of the cavern. A number of experimental and numerical investigations have demonstrated the significant influences of discontinuities on the mechanical, thermal and hydraulic behaviors of discontinuous rock masses, indicating that the deformation mechanism and stability of rock structures in the discontinuous rock masses depend not only on the existing discontinuities but also on the new cracks generated and thereafter keep propagating due mainly to the stress redistribution induced by excavation.In this study, an expanded distinct element method (EDEM) was developed for simulating the crack generation and propagation due to the shear and tension failures in the matrix rock blocks. Using this method, excavation simulations of deep underground caverns have been carried out on the models with differing depths of cavern and differing geometrical distributions of the existing discontinuities. Model experiments by using the base friction test apparatus were conducted to verify the proposed numerical approach. Furthermore, the support effects of rock bolts on controlling the deformations of the rock mass surrounding a cavern and movements of key blocks were evaluated by means of the EDEM approach. |
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