A Numerical Study on Rock Breaking by Typical Worn Hobs Based on the Finite Element Method

DOI

10.2991/978-94-6463-658-1_23How to use a DOI?

Keywords

Eccentric wear; Blade chipping; Rock-breaking volume; Finite element method

Abstract

The wear of hobs in shield tunneling directly affects construction efficiency and safety. This study utilized 3D scanning to identify typical types of hob damage in shield tunneling machines and employed the finite element method to investigate the influence of hob wear on its rock-breaking performance and efficiency. The results revealed that when a hob with eccentric wear breaks rock, stress concentrations occur at the point of maximum eccentric wear. For hobs with blade chipping, stress concentrations emerge between the chipped blade edges, exacerbating wear and the expansion of the chipped opening. As the eccentric wear of the hob increases, the amount of rock damage significantly decreases. Additionally, when the blade chipping angle exceeds 60°, the rock-breaking volume diminishes with further increases in the chipping angle. Eccentric wear of the hob has a more pronounced impact on rock-breaking efficiency. Furthermore, a quantitative relationship between the amount of eccentric wear, the number of worn hobs, and the rock-breaking volume was established, providing essential data for determining the optimal replacement timing of worn hobs in shield tunneling machines during engineering projects.

Copyright

© 2025 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - Jun Liu
AU  - Tong Ding
AU  - Guangrun Ni
AU  - Jipeng Liu
AU  - Jian Zhang
AU  - Peng Hao
PY  - 2025
DA  - 2025/03/03
TI  - A Numerical Study on Rock Breaking by Typical Worn Hobs Based on the Finite Element Method
BT  - Proceedings of the 2024 10th International Conference on Architectural, Civil and Hydraulic Engineering (ICACHE 2024)
PB  - Atlantis Press
SP  - 230
EP  - 236
SN  - 2352-5401
UR  - https://doi.org/10.2991/978-94-6463-658-1_23
DO  - 10.2991/978-94-6463-658-1_23
ID  - Liu2025
ER  -