Study on the influence of confining stress on TBM performance in granite rock by linear cutting test |
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| Affiliation: | 1. CNNC Beijing Research Institute of Uranium Geology, Beijing, China;2. Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing, China;3. NJU-ECE, Institute for Underground and Geo-environment, Nanjing, Jiangsu 210093, China;1. School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an, China;2. Department of Civil and Transport Engineering, NTNU, Trondheim, Norway;1. Ecole Polytechnique Fédérale de Lausanne (EPFL), Laboratory for Rock Mechanics (LMR), 1015 Lausanne, Switzerland;2. Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing 100124, China;1. Ecole Polytechnique Fédérale de Lausanne (EPFL), Laboratory for Rock Mechanics (LMR), 1015 Lausanne, Switzerland;2. Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing 100124, China;3. CNNC Beijing Research Institute of Uranium Geology, Beijing 100029, China;4. School of Earth Sciences and Engineering, Nanjing University, Nanjing 210008, China;1. Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing 100124, China;2. Xinou Machinery CO. LTD, Guangzhou, China |
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| Abstract: | Rock stress problems induced by overburden or anisotropic stresses are significant to the TBM tunneling. In this paper, the effect of different confining stressed conditions on TBM performance are investigated by using full-scale cutting tests with large intact granite specimens (1000 mm × 1000 mm × 600 mm). In these tests, the effects of confining stresses on the normal force, rolling force, the cutting coefficient and specific energy are analyzed. It is found that the confining stress has significant impact on the normal force and rolling force. Specifically, for the same cutting spacing and penetration depth, the normal force increases with increasing confining stress due to enhancement of the rock resistance strength; meanwhile the rolling force decreases gradually with increasing confining stress. The stress deviation between two confining directions affects the optimum penetration that corresponds to small specific energy. The results provide better understanding of the effect of confining stress on the TBM performance and also recommend some guidelines for TBM tunneling under stressed geological condition. |
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| Keywords: | TBM performance Confining stress Granite LCM |
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