Model for penetration of the TBM disc cutter under laser pre-drilling based on stress concentration in a circular hole and its test verification

ZHANG Kui; CHEN Zhenyu; YANG Chang; ZHENG Xuejun; ZHANG Xuhui

doi:10.11779/CJGE20230132

Volume 46 Issue 6

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Chinese Journal of Geotechnical Engineering > 2024 > 46(6): 1279-1288. > DOI: 10.11779/CJGE20230132

ZHANG Kui, CHEN Zhenyu, YANG Chang, ZHENG Xuejun, ZHANG Xuhui. Model for penetration of the TBM disc cutter under laser pre-drilling based on stress concentration in a circular hole and its test verification[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(6): 1279-1288. DOI: 10.11779/CJGE20230132

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Model for penetration of the TBM disc cutter under laser pre-drilling based on stress concentration in a circular hole and its test verification

1.
Mechanics Postdoctoral Research Mobile Station, College of Mechanical Engineering and Mechanics, Xiangtan University, Xiangtan 411105, China
2.
Engineering Research Center of Complex Track Processing Technology & Equipment, Xiangtan University, Xiangtan 411105, China
3.
College of Engineering and Design, Hunan Normal University, Changsha 410081, China

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Received Date: February 19, 2023
Available Online: June 04, 2024

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Abstract

Abstract

The laser generator is installed on the cutterhead of the tunneling boring machine (TBM), and the high-energy laser is used to assist the TBM tunneling operation, which is expected to achieve the purpose of thermal-mechanically efficient rock breaking in theory. For the laser-assisted rock breaking by disc cutter, based on the method for elastic stress state of the stress concentration theory in a circular hole and the cavity expansion model, a theoretical model for rock penetration by cutter under laser pre-drilling is established considering the effects of dense core, and it is theoretically analyzed. Subsequently, the laser-assisted disc cutter indenter penetration tests under confining pressure are carried out to verify the theoretical model. The results show that both the edge width and the hole spacing have effects on the vertical force, and that when the hole spacing is small, the theoretical model is no longer applicable. Through comparative analysis of the theoretical model and the test results, the vertical force has the same change trend with change in the hole spacing and is relatively consistent. The theoretical model is of certain accuracy.
- TBM,
- theoretical modeling,
- laser pre-drilling,
- stress concentration in a circular hole,
- test verification

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References (26)

References

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