|Table of Contents|

Analysis of the radial temperature field variation laws and influencing factors in cold region tunnels(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2023年6期
Page:
83-94
Research Field:
桥梁与隧道工程
Publishing date:

Info

Title:
Analysis of the radial temperature field variation laws and influencing factors in cold region tunnels
Author(s):
ZHAO Peng-yu1; 2;  CHEN Jian-xun1; 2;  LUO Yan-bin1; 2;  DONG Ti-jian1; XUN Wen-jie1;  CHEN Li-jun1; 2;  WANG Chuan-wu1; 2
(1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. Scientific Observation and Research Base of Transport Industry of Meteorology and Structural Mechanical State of Tunnels in Cold Areas, Xi'an, 710064, Shaanxi, China)
Keywords:
tunnel engineering;  cold region;  temperature field;  variation law;  influence factor;  tunnel lining;  surrounding rock
PACS:
U452.2
DOI:
10.19721/j.cnki.1671-8879.2023.06.008
Abstract:
In order to investigate the temperaturefield variation laws along the radial depth of tunnel lining and surrounding rock, as well as the influence of different factors, the control variable method was used and 21 calculationconditions were set. The criterion for determining the temperature influence boundary of surrounding rock was setas annual temperature amplitude of 0.05 ℃. Through numerical simulation calculation, the variation laws of annualaverage temperature and annual temperature amplitude of tunnel lining and surrounding rock along the radial depthwere studied. The influence of five factors, including of the annual average temperature and annual temperatureamplitude of air, and the initial temperature, thermal conductivity and thermal diffusion coefficient of surroundingrock, on temperature variation laws of lining and surrounding rock were analyzed. The results show that theannual average temperature and annual temperature amplitude of tunnel lining vary approximately linearly along the radial depth, while the surrounding rock increases and decreases logarithmicallyand exponentially, respectively. Theannual average temperature of lining and surrounding rock is positively linear correlated with the annual averagetemperature of air and the initial temperature of surrounding rock. The annual temperature amplitude of lining andsurrounding rock is similarly, but not influenced by the initial temperature of surrounding rock. As the annualtemperature amplitude of air decreases, the temperature influence boundary depth of surrounding rock decreases,and the overall annual average temperature of lining and surrounding rock increases. With the increase in thethermal conductivity of surrounding rock, the annual average temperature of tunnel lining and surrounding rockslightly increase. But, the attenuation multiple of the annual temperature amplitude from the air to the surface ofsurrounding rock significantly increases, resulting in decrease in the annual temperature amplitude of thesurrounding rock. Consequently, the freezing depth of surrounding rock decreases in winter. As the thermaldiffusion coefficient of surrounding rock increases, the attenuation multiple of annual temperature amplitude fromair to the surface of surrounding rock decreases, and the attenuates rate of annual temperature amplitude ofsurrounding rock slows down along the radial depth. As a result, the annual temperature amplitudes of lining andsurrounding rock are relatively high. Additionally, the temperature influence boundary depth of surrounding rockincreases, and the overall annual average temperature of tunnel lining and surrounding rock decreases.Consequently, the freezing depth of surrounding rock increases in winter.2 tabs, 20 figs, 31 refs.

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Last Update: 2023-10-30