Study on the Mechanism of Tunnel Subhorizontal Jet Grouting Reinforcement Based on a Shell Model on Two-Parameter Foundation
Publication: Journal of Engineering Mechanics
Volume 150, Issue 4
Abstract
Horizontal jet grouting columns (HJGCs) are commonly adopted to reinforce weak ground ahead of the tunnel excavation face. However, the dynamic mechanical response of the HJGCs during tunneling remains unclear. To provide a comprehensive understanding of HJGC reinforcement mechanisms and a basis for optimal design, a mechanical shell model for the HJGCs based on the two-parameter Pasternak foundation is initially established, and the analytical solutions for deflection and internal force are derived. Furthermore, the feasibility of the proposed model is validated through comparisons with numerical simulations based on an actual project. Subsequently, the mechanical behavior of the HJGCs and the sensitivity of the design parameters on the HJGCs deformation are examined. Additionally, the influence of various factors on tunnel face stability is deliberated. The findings suggest that the analytical solution derived from the proposed model aligns closely with the results obtained through numerical simulation. The longitudinal deflection pattern of the HJGCs is categorized into the airside impact zone, excavation disturbance zone, and forward stability zone. Significantly, the transverse deflection at the vault exhibits the greatest magnitude and gradually diminishes toward the arch foot. Longitudinally, the HJGCs reinforcement effectively serves as a spatial leverage mechanism, facilitating the redistribution of pressure within the spatial domain. In addition, the sequence of the impact levels of the discussed parameters or factors is presented individually.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
This investigation was financially supported by the National Natural Science Foundation of China (Grant Nos. 51768020 and 42177162), the Natural Science Foundation of Jiangxi Province (No. 20212BAB214009), and the Science and Technology Project of the Department of Transportation of Jiangxi Province (No. 2020Z0001).
Author contributions: Yufeng Shi: conceptualization, resources, supervision, methodology, funding acquisition, and writing–original draft. Tao Zhang: investigation, conceptualization, methodology, software, and formal analysis. Chengwei Cao: software, writing–original draft, visualization, and data curation. Xiangsheng Chen: writing—review and editing, validation, and methodology. Yonghua Wen: project administration, supervision, and writing–review and editing.
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Published In
Journal of Engineering Mechanics
Volume 150 • Issue 4 • April 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Dec 2, 2022
Accepted: Oct 31, 2023
Published online: Feb 2, 2024
Published in print: Apr 1, 2024
Discussion open until: Jul 2, 2024
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