Micromechanics-based prediction of creep failure of hard rock for long-term safety of high-level radioactive waste disposal system |
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| Affiliation: | 1. Radioactive Waste Management Funding and Research Center, 2-8-10 Toranomon, Minato-ku, Tokyo 105-0011, Japan;2. Department of Civil and Environmental Engineering, Saitama University, 255 Shimo-Ookubo, Saitama 338-8570, Japan;3. Department of Civil Engineering, University of Tokyo, 7-3-1 Hongo, Bunkyou-ku, Tokyo 113-8656, Japan;1. School of Medicine, Kermanshah University of Medical Sciences, Kermanshah, Iran;2. Applied Neuroscience Research Center, Bagiyatallah (a.s.) University of Medical Sciences, Tehran, Iran;3. Department of Experimental Science, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran;4. Department of Pharmacology and Toxicology, School of Pharmacy, Kermanshah University of Medical Sciences, Kermanshah, Iran;5. Novel Drug Delivery Research Center, Kermanshah University of Medical Sciences, Kermanshah, Iran;6. Department of Neuroscience, School of Advanced Medical Technologies, Tehran University of Medical Sciences, Tehran, Iran;7. Kermanshah University of Technology, Kermanshah, Iran;8. Department of Microbiology, Immunology and Biochemistry, University of Tennessee Health Science Center, Memphis, TN, USA;1. Beijing Key Laboratory of Urban Oil & Gas Distribution Technology, China University of Petroleum-Beijing, Beijing 102249, China;2. Aramco Services Company: Aramco Research Center-Houston, TX 77084, USA;3. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan, Hubei 030021, China;4. Taiyuan University of Science and Technology, Taiyuan, Shanxi 030021, China;1. NTNU Norwegian University of Science and Technology, Department of Petroleum Engineering & Applied Geophysics, N-7491 Trondheim, Norway;2. SINTEF Petroleum Research, Formation Physics Department, N-7465 Trondheim, Norway;3. Det Norske Oljeselskap ASA, Føniks, Munkegata 26, N-7011 Trondheim, Norway |
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| Abstract: | A high-level radioactive waste disposal project is under way in Japan. Isolation of the radioactive waste in a rock formation at great depth is considered as one of the promising disposal methods. Before proceeding with the disposal project, however, assessment of the long-term stability of rock mass surrounding waste packages is necessary. This paper presents a micromechanics-based model for predicting the creep failure of hard rock under compression. The subcritical crack growth due to stress corrosion cracking and interaction effects between cracks are considered as the main mechanisms of creep failure. An evolution problem of two interacting cracks is formulated and creep failure following tertiary creep is represented as unstable extension of the interacting cracks in the present model. The time to failure is calculated for different values of axial stress, confining pressure, and environmental conditions such as temperature and presence of water. The effects of water, temperature, and stress states on the long-term behavior are also included in the proposed model. |
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