Citation

Zhou J, Shen W, Zhu Y, Fan J, Yin J, Wu Q. China Saf. Sci. J. 2022; 32(6): 44-52.

Copyright

(Copyright © 2022, China Occupational Safety and Health Association, Publisher Gai Xue bao)

DOI

10.16265/j.cnki.issn1003-3033.2022.06.2326

PMID

unavailable

Abstract

In order to optimize usage amount and layout parameters of ice blocks used for cooling effect in high geothermal tunnel construction, a numerical model of tunnel ventilation and ice block cooling was established based on solidification and melting theory. With volume fraction as a research index, influence of usage amount, specific surface area and placement height on melting rate of ice blocks was studied. Then, evolution characteristics of tunnel temperature fields under different working conditions were compared and analyzed, and optimal ice block cooling scheme was obtained. The results show that average temperature in the tunnel decreases by 8 ℃ when ice volume increases from 1 m3 / side to 2. 5 m3 / side. The melting rate of thin-walled ice block with specific surface area of 6×10-6 m2 / g is 1. 6 times higher than that of the block with 5×10-6 m2 / g. Moreover, after the block is lifted by 2 m, temperature at the same time is reduced by about 2 ℃ compared with non-lifting condition. Remarkable cooling effect in tunnel can be achieved for the scheme with 1. 5-2. 5 m3 / side thin-wall ice being lifted by 2 m. © PHYSOR 2022 China Safety Science Journal. All rights reserved.

Language: zh