- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
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| Citation: | ZHANG Mengqi, WANG Yibo, ZHANG Longguan, DUAN Wenjun, SU Yemao, MO Jiliang, ZHOU Zhongrong. Effects of TBM Cutter Profile on Rock Fragmentation Under Different Rock Type and Confining Pressure Conditions[J]. Journal of Southwest Jiaotong University, 2023, 58(2): 332-339. doi: 10.3969/j.issn.0258-2724.20210171
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The disc cutters located at the front end of a full-section tunnel boring machine (TBM) play an important role in the rock breaking process. The influence of the cross-sectional profile of the disc cutter on the rock fragmentation is important to study, to improve the TBM tunneling efficiency in engineering practice. Here, a two-dimensional particle flow model for rock cutting is established. Aiming at the flat-tip and circular-tip cutters, which are commonly used in engineering, two kinds of rocks with different strengths are selected, and a fixed confining pressure of 10 MPa is applied to one of the rocks. Then the rock cutting simulation is carried out, and the correlation between the cutter profile shape and the rock fragmentation is studied by analyzing the results of specific energies, rock fragment volumes, cutting forces, and crack numbers. A reduced-scale rock cutting experiment is performed to verify the correctness of the conclusions obtained from the simulations. The simulation results show that the cutter profile has a significant influence on the rock cutting performance. The specific energy of the circular-tip cutter is lower than that of the flat-tip cutter under most rock strengths and confining pressure conditions. The average reduction in the specific energy is 19.8% because the cutting force of the circular-tip cutter is 32.6% lower than that of the flat-top cutter on average. This indicates that the circular-top cutter does less work when tunneling, even though the total volumes of rock fragments created by the two types of cutters are similar (the average difference is 7%). Therefore, the circular-top cutter consumes less energy to break the same volume of rock. In summary, of the two commonly used cutter profiles, the circular-tip cutter is preferred for hard rock and high confining pressure tunneling.
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