Rock Crushing Analysis of TBM Disc Cutter Assisted by Ultra-High-Frequency Loading

In the construction of mountain tunnels, the increasing proportion of hard rock stratum enhances the difficulty of rock breaking by tunnel boring machine (TBM). As a type of cyclic load with ultrahigh frequency, ultrasonic vibration has the advantages of energy concentration and strong penetration....

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Published inShock and vibration Vol. 2022; pp. 1 - 17
Main Authors Zhao, Dajun, Han, Junpeng, Zhou, Yu, Lv, Xiaoshu, Zhang, Shulei, Gao, Ke, Zhao, Yan
Format Journal Article
LanguageEnglish
Published Cairo Hindawi 2022
John Wiley & Sons, Inc
Wiley
Subjects
Boring machines
Cracks
Crushing
Cyclic loads
Damage
Disc cutters
Drilling & boring machinery
Efficiency
Equations of motion
Load
Mountain tunnels
Penetration
Simulation
Software
Stress distribution
Tunnel construction
Ultrahigh frequencies
Ultrasonic vibration
Online AccessGet full text
ISSN1070-9622
1875-9203
DOI10.1155/2022/1177745

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Abstract In the construction of mountain tunnels, the increasing proportion of hard rock stratum enhances the difficulty of rock breaking by tunnel boring machine (TBM). As a type of cyclic load with ultrahigh frequency, ultrasonic vibration has the advantages of energy concentration and strong penetration. In the process of rolling and extrusion, the weakening of the rock by ultrahigh-frequency loading can improve the rock crushing efficiency of the TBM disc cutter. In this study, we established a physical model of rock cutting using a disc cutter assisted by ultrasonic vibration and obtained a motion equation. The discrete element software particle flow code (PFC) was selected to construct a heterogeneous granite model to demonstrate the mechanism and development of cracks inside the hard rock under a rolling disc cutter assisted by ultrasonic vibration. The results demonstrate that ultrasonic vibration helps the disc cutter construct a stronger stress field in the shallow layer, which promotes tensile damage of the surface rock. Vibration promotes the development of cracks inside the rock and accelerates the penetration of transverse cracks, which is conducive to the stripping of rock fragments. The addition of ultrahigh-frequency loading also reduces the fluctuation increase of cracks, which makes the operation state of the disc cutter more stable and avoids abnormal damage to tools.
AbstractList In the construction of mountain tunnels, the increasing proportion of hard rock stratum enhances the difficulty of rock breaking by tunnel boring machine (TBM). As a type of cyclic load with ultrahigh frequency, ultrasonic vibration has the advantages of energy concentration and strong penetration. In the process of rolling and extrusion, the weakening of the rock by ultrahigh-frequency loading can improve the rock crushing efficiency of the TBM disc cutter. In this study, we established a physical model of rock cutting using a disc cutter assisted by ultrasonic vibration and obtained a motion equation. The discrete element software particle flow code (PFC) was selected to construct a heterogeneous granite model to demonstrate the mechanism and development of cracks inside the hard rock under a rolling disc cutter assisted by ultrasonic vibration. The results demonstrate that ultrasonic vibration helps the disc cutter construct a stronger stress field in the shallow layer, which promotes tensile damage of the surface rock. Vibration promotes the development of cracks inside the rock and accelerates the penetration of transverse cracks, which is conducive to the stripping of rock fragments. The addition of ultrahigh-frequency loading also reduces the fluctuation increase of cracks, which makes the operation state of the disc cutter more stable and avoids abnormal damage to tools.
Author Zhao, Dajun
Gao, Ke
Han, Junpeng
Zhou, Yu
Lv, Xiaoshu
Zhang, Shulei
Zhao, Yan
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  organization: College of Construction Engineering Jilin University Changchun 130026 China jlu.edu.cn
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  organization: Yellow River Survey Planning and Design Institute Co Ltd. Zhengzhou Henan 450003 China
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  organization: Key Laboratory of Geophysical Exploration Equipment Ministry of Education Jilin University Changchun 130026 China jlu.edu.cn
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Copyright Copyright © 2022 Dajun Zhao et al.
Copyright © 2022 Dajun Zhao et al. This is an open access article distributed under the Creative Commons Attribution License (the “License”), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. https://creativecommons.org/licenses/by/4.0
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SubjectTerms Boring machines
Cracks
Crushing
Cyclic loads
Damage
Disc cutters
Drilling & boring machinery
Efficiency
Equations of motion
Load
Mountain tunnels
Penetration
Simulation
Software
Stress distribution
Tunnel construction
Ultrahigh frequencies
Ultrasonic vibration
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Title Rock Crushing Analysis of TBM Disc Cutter Assisted by Ultra-High-Frequency Loading
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