Effect of confining pressure on rock breaking by high-pressure waterjet-assisted TBM Article Swipe
Chen Xu
,
Yujie Zhu
,
Xiaoli Liu
,
Fei Chen
,
Min Zhu
,
Enzhi Wang
,
Sijing Wang
·
YOU?
·
· 2024
· Open Access
·
· DOI: https://doi.org/10.1016/j.undsp.2023.12.001
YOU?
·
· 2024
· Open Access
·
· DOI: https://doi.org/10.1016/j.undsp.2023.12.001
High-pressure waterjet-assisted tunnel boring machine (WTBM) is an efficient method for improving the tunneling performance of a tunnel boring machine (TBM) and reducing the wear of its disc cutters in hard rock with high geostresses. Confining pressure directly affects the efficiency of rock breaking and the configuration of the disc cutters. In this study, we evaluated the effect of confining pressure on WTBM rock breaking by developing a self-designed and manufactured experimental system, including confining pressure loading, TBM disc-cutter penetration, and high-pressure waterjet. The macro fracture, acoustic emission (AE), peak normal force drop, and specific energy (SE) were analyzed for four different confining pressures (10, 20, 30, and 35 MPa). The results showed that the cutting depth of the waterjet increased linearly as the waterjet pressure increased and decreased with the gradual increase in the nozzle moving speed. The expansion and development of cracks formed rock debris, and the size of the rock fragments decreased with an increase in confining pressure. When the waterjet pressure was 280 MPa, the nozzle moving velocity was 800 mm/min and the kerf space was 75 mm, which indicated that the confining pressure, which was 23.16 MPa, minimized the cutting SE under this condition. However, regardless of the confining pressure, the maximum normal force of WTBM was less than that of a TBM, whereas the SE of WTBM was less than that of complete TBM cutting mode (CTCM). The average force drop and average drop rate of SE were approximately 25%, and 80%, respectively. The results of this study can inspire the design and mechanism of a TBM assisted by a high-pressure waterjet.
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Metadata
- Type
- article
- Language
- en
- Landing Page
- https://doi.org/10.1016/j.undsp.2023.12.001
- OA Status
- diamond
- Cited By
- 7
- References
- 27
- Related Works
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- OpenAlex ID
- https://openalex.org/W4392520102
All OpenAlex metadata
Raw OpenAlex JSON
- OpenAlex ID
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https://openalex.org/W4392520102Canonical identifier for this work in OpenAlex
- DOI
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https://doi.org/10.1016/j.undsp.2023.12.001Digital Object Identifier
- Title
-
Effect of confining pressure on rock breaking by high-pressure waterjet-assisted TBMWork title
- Type
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articleOpenAlex work type
- Language
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enPrimary language
- Publication year
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2024Year of publication
- Publication date
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2024-03-06Full publication date if available
- Authors
-
Chen Xu, Yujie Zhu, Xiaoli Liu, Fei Chen, Min Zhu, Enzhi Wang, Sijing WangList of authors in order
- Landing page
-
https://doi.org/10.1016/j.undsp.2023.12.001Publisher landing page
- Open access
-
YesWhether a free full text is available
- OA status
-
diamondOpen access status per OpenAlex
- OA URL
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https://doi.org/10.1016/j.undsp.2023.12.001Direct OA link when available
- Concepts
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Overburden pressure, Nozzle, Materials science, Pressure drop, Drop (telecommunication), Geotechnical engineering, Composite material, Mechanics, Geology, Engineering, Mechanical engineering, PhysicsTop concepts (fields/topics) attached by OpenAlex
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7Total citation count in OpenAlex
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2025: 7Per-year citation counts (last 5 years)
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27Number of works referenced by this work
- Related works (count)
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10Other works algorithmically related by OpenAlex
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