Comparison of DEM Models with Different Elemental Dimensions for TBM Disc Cutter Rock Fragmentation

Chen Xu, Yujie Zhu, Danqing Song (), Xiaogang Guo, Xiaoli Liu, Enzhi Wang and Runhu Lu
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Chen Xu: Changjiang Institute of Survey, Planning, Design and Research, Wuhan 430010, China
Yujie Zhu: State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China
Danqing Song: State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China
Xiaogang Guo: Changjiang Institute of Survey, Planning, Design and Research, Wuhan 430010, China
Xiaoli Liu: State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China
Enzhi Wang: State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China
Runhu Lu: School of Civil Engineering and Architecture, Henan University, Kaifeng 475004, China

Sustainability, 2022, vol. 14, issue 19, 1-20

Abstract: Disc cutters are the dominant tool used in the excavation of hard rock formations in any underground construction application, such as when tunneling using tunnel-boring machines (TBM), as well as in shaft- and raise boring operations. Optimization of the cutting geometry of a given disc cutter for application in a rock formation often involves full-scale cutting tests, which is a difficult and costly proposition. An alternative to full-scale testing is the numerical simulation of TBM disc cutters for optimization under different settings. Recent efforts in the field of numerical simulations of rock cutting have shown the relative success of discrete element models, such as particle flow code (PFC), to simulate two- and three-dimensional rock fragmentation. This study is focused on a sensitivity analysis of PFC simulation of rock-cutting relative to the size of the elements. The calculated cutting forces were compared with the recorded forces under various conditions during full-scale tests using a linear cutting machine (LCM) on Colorado red granite (CRG). The estimated cutting coefficient and specific energy in the LCM tests and simulations showed good correlations, which validates the numerical simulation results. Two- and three-dimensional models showed that two-dimensional numerical models can offer a qualitative assessment of crack development, whereas three-dimensional models could be used to estimate the specific energy when cutting. The results can help in predicting the cutting forces in different rocks and ultimately improving disc-cutter geometry and cutter-head design.

Keywords: disc cutters; tunnel-boring machine (TBM); discrete element modeling (DEM); cutting force; specific energy; linear cutting machine (LCM) (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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