摘要
为探究西成铁路寒区隧道温度场分布规律,依据实测气象资料并考虑热位差对寒区隧道温度场分布的影响,对沿线20座隧道温度场进行了计算分析,归纳总结了寒区隧道洞内温度场分布规律。通过计算可知,隧道围岩径向的冻结深度随着地温增加以及洞外气温升高而减小,气温每降低1℃围岩径向冻结深度增加0.12 m;地温每增加1℃,围岩径向冻结深度减小0.08 m。隧道纵向温度场分布不对称性随隧道内外温差的增加以及进出口海拔高差的增加而显著,低海拔洞口段进出口高差每增加50 m,纵向冻结长度增加约360 m;气温每降低1℃,低海拔洞口纵向冻结长度增加约300 m,高海拔洞口增加约110 m。
In order to explore the distribution law of temperature field in cold tunnel,according to the meteorological data and considering the influence of thermal potential difference on the temperature field distribution in cold tunnel,the temperature field in the representative tunnel along Xicheng railway was calculated and analyzed,and the distribution law of temperature field in the tunnel in cold region was summarized statistically based on the calculation results.According to the theoretical analysis,due to the temperature difference between inside and outside of the tunnel and the height difference between inlet and outlet,the negative temperature distance of the tunnel section at the low opening was obviously longer than that at the high opening section.Through calculation,it is found that the radial freezing depth of surrounding rock decreases with the increase of ground temperature and the increase of air temperature outside the cave.The radial freezing depth of surrounding rock increases by 0.12 m with the decrease of 1℃of air temperature,and the radial freezing depth of surrounding rock decreases by 0.08 m with the increase of 1℃of ground temperature.The asymmetry of longitudinal temperature distribution becomes more significant with the increase of temperature difference inside and outside the tunnel and elevation difference between inlet and outlet.For the entrance section at low altitude,the longitudinal freezing length increases about 360 m for every 50 m increase in the elevation difference between inlet and outlet.When the temperature decreases by 1℃,the longitudinal freezing length of the mouth of the cave at low altitude increases by 300 m,and that of the mouth at high altitude increases by 110 m.
作者
张晨曦
张明明
朱永全
王仁远
徐硕
何永旺
ZHANG Chen-xi;ZHANG Ming-ming;ZHU Yong-quan;WANG Ren-yuan;XU Shuo;HE Yong-wang(School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China;China Railway 12th Bureau Group Co., Ltd., Taiyuan 030024, China;China Railway First Survey and Design Institute Group Co., Ltd., Xi'an 710043, China)
出处
《科学技术与工程》
北大核心
2022年第3期1250-1256,共7页
Science Technology and Engineering
基金
国家自然科学基金(51778380)。
关键词
寒区隧道
热位差
温度场
统计分析
cold tunnel
thermal head
temperature field
statistical analysis
