LAPSE:2020.1267
Published Article
LAPSE:2020.1267
Experimental and Numerical Investigation on Improved Design for Profiled Freezing-tube of FSPR
Yin Duan, Chuanxin Rong, Hua Cheng, Haibing Cai, Zongjin Wang, Zhishu Yao
December 22, 2020
The freeze-sealing pipe roof (FSPR) method, which combines the pipe roof method (PRM) with the artificial ground freezing (AGF) method, has been successfully utilized for the first time in the Gongbei Tunnel Project in China. During the construction process, there have been practical problems such as difficulty in welding of the profiled freezing-tube, easy leakage of refrigerant, and working environment pollution, which bring difficulties to the tunnel construction and may affect the further promotion of this new method in the future. To address these problems, a method of placing double circular freezing-tubes on the inner wall of the hollow pipe and wrapped with cement mortar was put forward to replace the welding profiled freezing-tube in the actual project. By designing a scaled model test, the feasibility and freezing effect of this improved design were verified. The corresponding numerical calculation model was established to study the distribution characteristics and differences of temperature field under two different configurations. The research results show that the Configuration 2, with the improved design, presents a lower temperature and a higher cooling rate; the limiting-tube could limit the excessive development of the frozen soil wall within a certain range, to avoid the adverse impact of frost heave on the ground building structure. Under the premise of meeting the design requirements for freezing, the freezing time of Configuration 2 at the centerline between the pipes and the vertical line of the hollow pipe is 33% and 46% shorter than that of Configuration 1, respectively. Finally, the average thickness of the frozen soil wall at the right side of the hollow pipe, the vertical direction of the hollow pipe, and between the pipes increased 33%, 17%, and 13% in Configuration 2, respectively. The improved design proposed in this paper is not only more convenient in production and installation but is also demonstrated to provide improved freezing effects, providing a strong guarantee for the further popularization and application of the freeze-sealing pipe roof method.
Keywords
freeze-sealing pipe roof method, freezing tube, improved design, numerical simulation, scaled model test, temperature field
Suggested Citation
Duan Y, Rong C, Cheng H, Cai H, Wang Z, Yao Z. Experimental and Numerical Investigation on Improved Design for Profiled Freezing-tube of FSPR. (2020). LAPSE:2020.1267
Author Affiliations
Duan Y: School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China [ORCID]
Rong C: School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China
Cheng H: School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China
Cai H: School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China [ORCID]
Wang Z: China Coal Special Drilling Engineering Co., Ltd., Hefei 230001, China
Yao Z: School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China [ORCID]
Journal Name
Processes
Volume
8
Issue
8
Article Number
E992
Year
2020
Publication Date
2020-08-15
Published Version
ISSN
2227-9717
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PII: pr8080992, Publication Type: Journal Article
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LAPSE:2020.1267
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doi:10.3390/pr8080992
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Dec 22, 2020
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