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Geomechanics and Engineering Volume 34, Number 1, July10 2023 , pages 103-113 DOI: https://doi.org/10.12989/gae.2023.34.1.103 |
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TBM disc cutter ring type adaptability and rock-breaking efficiency: Numerical modeling and case study |
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Xiaokang Shao, Yusheng Jiang, Zongyuan Zhu, Zhiyong Yang, Zhenyong Wang,
Jinguo Cheng and Quanwei Liu
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| Abstract | ||
| This study focused on understanding the relationship between the design of a tunnel boring machine disc cutter ring and its rock-breaking efficiency, as well as the applicable conditions of different cutter ring types. The discrete element method was used to establish a numerical model of the rock-breaking process using disc cutters with different ring types to reveal the development of rock damage cracks and variation in cutter penetration load. The calculation results indicate that a sharp-edged (V-shaped) disc cutter penetrates a rock mass to a given depth with the lowest load, resulting in more intermediate cracks and few lateral cracks, which leads to difficulty in crack combination. Furthermore, the poor wear resistance of a conventional V-shaped cutter can lead to an exponential increase in the penetration load after cutter ring wear. In contrast, constant-cross-section (CCS) disc cutters have the highest quantity of crack extensions after penetrating rock, but also require the highest penetration loads. An arch-edged (U-shaped) disc cutter is more moderate than the aforementioned types with sufficient intermediate and lateral crack propagation after cutting into rock under a suitable penetration load. Additionally, we found that the cutter ring wedge angle and edge width heavily influence cutter rock-breaking efficiency and that a disc cutter with a 16 to 22 mm edge width and 20 to 30 wedge angle exhibits high performance. Compared to V-shaped and U-shaped cutters, the CCS cutter is more suitable for soft or medium-strength rocks, where the penetration load is relatively small. Additionally, two typical case studies were selected to verify that replacing a CCS cutter with a U-shaped or optimized V-shaped disc cutter can increase cutting efficiency when encountering hard rocks. | ||
| Key Words | ||
| blade width; cutter ring type; damage crack; discrete element method; rock breaking; TBM construction; wedge angle | ||
| Address | ||
| Xiaokang Shao, Yusheng Jiang, Zongyuan Zhu, Zhiyong Yang, Zhenyong Wang and Jinguo Cheng: School of Mechanics and Civil Engineering, China University of Mining and Technology-Beijing, Ding, No. 11 Xueyuan Road, Haidian District, Beijing 100083, P.R. China Quanwei Liu: Qingdao Metro Line 6 Co Ltd, No.177 Binhai Road, Huangdao District, Qingdao 266000, P.R. China | ||