The effects of joints on rock fragmentation by TBM cutters using General Particle Dynamics |
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| Affiliation: | 1. School of Civil Engineering, Chongqing University, Chongqing 400045, China;2. School of Geoscience, Hefei university of Technology, Hefei 230009, China;1. Southwest Jiaotong University, Key Laboratory of Transportation Tunnel Engineering of Ministry of Education, Chengdu 610031, China;2. Zhejiang Hanghai Intercity Railway CO., LTD., Haining 314499, China;3. China Railway 14th Bureau Group Shield Engineering CO., LTD., Nanjing 211800, China;1. College of Mechanical and Electrical Engineering, China University of Mining & Technology, Xuzhou 221116, China;2. Jiangsu Collaborative Innovation Center of Intelligent Mining Equipment, China University of Mining and Technology, Xuzhou 221008, China;1. School of Civil Engineering, Chongqing University, Chongqing 400045, China;2. National Joint Engineering Research Center of Geohazards Prevention in the Reservoir Areas, Chongqing 400045, China;3. Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Chengdu 610031, China;1. State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining & Technology, Xuzhou 221116, Jiangsu, China;2. School of Mechanics & Civil Engineering, China University of Mining & Technology, Xuzhou 221116, Jiangsu, China |
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| Abstract: | In this paper, a novel meshfree numerical method known as General Particle Dynamics (GPD) is proposed to reveal the mechanism of the rock fragmentation by TBM cutters. Rock fragmentation by two cutters in consecutive joints rock is investigated using GPD. The numerical results obtained from GPD are in good agreement with the field observed results. Moreover, the effects of the length of intermittent joints on rock fragmentation by two cutters are investigated using GPD. It is found from the numerical results that the length of intermittent joints can significantly influence the crack initiation and propagation and coalescence as well as the fragmentation pattern, and hence affect the penetration rate of the TBM. It indicates that GPD has the potential in simulating rock indentation and fragmentation by TBM cutters. |
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| Keywords: | General Particle Dynamics (GPD) Consecutive and intermittent joints Rock fragmentation efficiency TBM |
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