Two-Dimensional Numerical Simulation of Rock Fragmentation by TBM Cutting Tools in Mixed-Face Ground
Publication: International Journal of Geomechanics
Volume 18, Issue 3
Abstract
In the study described in this paper, a general particle dynamics (GPD) code was developed to simulate rock fragmentation by tunnel-boring machine (TBM) cutters in mixed-face ground. In the GPD code, a novel algorithm of the contacts at the boundary between two different media was proposed. The mechanism of rock fragmentation by two disc cutters and the effects of cutter spacing on rock fragmentation in mixed conditions were investigated. With increasing cutter spacing, the propagation pattern of Hertzian cracks varied and an optimal cutter spacing was found. The mechanism of rock fragmentation by a disc cutter and a drag bit and the effects of the acting position of different TBM cutters on rock fragmentation in mixed conditions were studied. The optimal acting position of the disc cutter and the drag bit was found to benefit the effectiveness of TBM rock fragmentation.
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Acknowledgments
This work was supported by Project 973 (Grant 2014CB046903), the National Natural Science Foundation of China (Grants 51325903 and 51679017), Natural Science Foundation Project of CQ CSTC (cstc2013kjrcljrccj0001), and Graduate Scientific Research and Innovation foundation of Chongqing, China (Grant CYB16012).
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Published In
International Journal of Geomechanics
Volume 18 • Issue 3 • March 2018
Copyright
© 2018 American Society of Civil Engineers.
History
Received: Jul 27, 2016
Accepted: Sep 11, 2017
Published online: Jan 8, 2018
Published in print: Mar 1, 2018
Discussion open until: Jun 8, 2018
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