高海拔大高差特长隧道洞内温度分布规律研究

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Abstract Research purposes:As the construction of the Sichuan-Tibet Railway progressing, the number of domestic super-long tunnels with high altitude and large elevation is soaring sharply. Because the current temperature distribution law in super-long tunnel with high altitude and large elevation is still unclear, it severely restricts its thermal insulation and anti-freezing design. If improperly fortified, the freezing damage will occur and furthermore, it will affect the operational safety. In this paper, taking the existing super-long tunnel with high altitude and large elevation as an example, the meteorological monitoring data inside and outside tunnel before and after construction are utilized to study a temperature distribution law and its influences on thermal insulation and anti-freezing length, and the relevant suggestions for thermal insulation and anti-freezing design are given by means of on-site monitoring, numerical simulation and other methods.
Research conclusions:(1) During the construction of tunnel, the temperature near tunnel face ranges from 13 °C to 16°C all year around and basically, it remains constant and less-affected by the temperature outside tunnel. The temperature value is mainly determined by the temperature of the surrounding rocks. (2) After the completion of tunnel, the longitudinal temperature distribution in tunnel are changed significantly and affected dramatically by the meteorological environmental conditions outside the tunnel. The "chimney effects" of the super-long tunnel with high altitude and large elevation is obvious. (3) The super-long tunnel with high altitude and large elevation will create a one-way natural ventilation from lower opening to higher opening, causing that the negative temperature length of the lower opening is apparently longer than that of higher opening and the temperature fields at both ends of the opening are asymmetrically distributed. (4) The research results can provide a reference for the construction of high-altitude tunnels with large elevation difference between lower and higher openings in Sichuan-Tibet Railway.

Key words： high-altitude tunnel large elevation one-way ventilation longitudinal temperature field thermal insulation and anti-freezing length

Received: 11 December 2020

PACS:

U452.2+

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	Articles by authors
	ZHENG Bo
	WU Jian
	ZHENG Jinlong
	TAO Weiming
	GUO Rui
	LENG Xiqian

Cite this article:

ZHENG Bo,WU Jian,ZHENG Jinlong, et al. Research on the Temperature Distribution Law in Super-long Tunnel with High Altitude and Large Elevation[J]. Journal of Railway Engineering Society, 2022, 39(1): 61-66.

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https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2022/V39/I1/61

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