热位差以及洞口净压差影响的寒区隧道温度场研究

Study on the Influence of Thermal Potential Difference and Superstatic Pressure Difference on Tunnel Temperature Field in Cold Region

为探究寒区隧道温度场分布规律,对国内26座已建成寒区隧道温度场实测数据进行了统计。在考虑隧道进出口高程差引起的超净压差和洞内外温差导致的热位差时,寒区隧道洞内纵向温度场呈不对称分布规律明显,低洞口段洞内纵向负温距离明显高于高洞口段。通过理论分析和数值计算并与实测数据进行对比发现:超净压差以及热位差越大,隧道纵向温度场不对称性分布越明显,且当低洞口端存在大气自然风时隧道纵向温度场不对称性更加突出。

In order to explore the distribution law of tunnel temperature field in cold region,the measured data of tunnel temperature field in 26 cold regions in China were calculated.When considering the super-net pressure difference caused by the elevation difference between the entrance and exit of the tunnel and the thermal potential difference caused by the temperature difference between the inside and outside of the tunnel,the longitudinal temperature field in the cold area of the tunnel was asymmetrically distributed,and the longitudinal negative temperature distance in the low opening section is obviously higher than that in the high opening section.Through theoretical analysis and numerical calculation and comparison with the measured data,it is found that the greater the supernet pressure difference and thermal potential difference,the more obvious the longitudinal temperature field asymmetry of the tunnel is,and it is more prominent when there is atmospheric natural wind at the end of the low opening.