Numerical calculation of temperature field of freeze-sealing pipe roof method in Gongbei tunnel

Authors

LONG Wei, School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China
RONG Chuanxin, School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, ChinaFollow
DUAN Yin, School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China; School of Architecture and Art, Huainan Union University, Huainan 232038, China
GUO Ke, School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China

Abstract

This paper took the Gongbei tunnel in the Zhuhai Connection Section of the Hong Kong-Zhuhai-Macao Bridge as an example to study the development of the temperature field of the Freeze-Sealing Pipe Roof Method. Based on the heat transfer theory of two-dimensional porous media, the FEM software COMSOL was used to numerically analyze the actual working conditions of the active freezing period, the numerical calculation was verified by field measurement. The development and distribution of the temperature field before and after the opening of the special-shaped freezing pipes was studied. The results showed that: when freezing for 30 days, the concrete pipe was completely wrapped by frozen soil, and a continuous frozen soil curtain began to form between the concrete pipe and empty pipe, when freezing for 50 days, the empty pipe was completely wrapped by frozen soil, when freezing for 90 days, the thickness of the frozen soil curtain at the concrete pipe and the empty jacking pipe reached 2.0 m, which met the design requirements. The average temperature change rates of the temperature measurement point at the midpoint between the concrete pipe and empty pipe were -0.86 ℃/d, -0.88 ℃/d and -0.25 ℃/d before the opening of the special-shaped freezing pipes, within 10 days after opening and within 10-20 days after opening, respectively. After that, the temperature of each measuring point tended to be stable, thus forming a relatively uniform frozen soil curtain. The results could provide technical reference for similar projects in the future.

Keywords

freeze-sealing pipe roof method, temperature field, frozen soil curtain, numerical calculation, Gongbei tunnel of the Hong Kong-Zhuhai-Macao Bridge

DOI

10.3969/j.issn.1001-1986.2020.03.023

Recommended Citation

LONG Wei, RONG Chuanxin, DUAN Yin, et al. (2020) "Numerical calculation of temperature field of freeze-sealing pipe roof method in Gongbei tunnel," Coal Geology & Exploration: Vol. 48: Iss. 3, Article 24.
DOI: 10.3969/j.issn.1001-1986.2020.03.023
Available at: https://cge.researchcommons.org/journal/vol48/iss3/24

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