Analysis of tunnel temperature distribution in cold regions accounting for daily temperature fluctuations
By employing the self-developed intelligent temperature logger,the temperature at various coordinates within the tunnel was monitored.The analysis focused on the cooling and coldest seasons to investigate the distribution pattern of the tunnel temperature field.By examining the daily cycle fluctuation characteristics of the temperature field in the Usshering No.1 Tunnel,an analytical computational model for the longitudinal temperature field of the tunnel was developed.This model integrates the observed features,along with a numerical simulation model for the cross-section of the tunnel.A numerical simulation was conducted using ANSYS software to examine the temperature field of the tunnel cross-section under daily cycle temperature fluctuations and to identify the associated daily cycle fluctuation characteristics.These models were utilized to assess how cave wind speed,daily temperature cycles at the tunnel entrance,and distance from the tunnel inlet influence the distribution pattern of the tunnel's longitudinal temperature field.Furthermore,an analysis was conducted to explore the distribution of daily cycle fluctuation characteristics across the tunnel's cross-section.The results revealed that the longitudinal temperature envelope of the tunnel takes on a trumpet-like shape,where the size of the opening correlates with the amplitude of daily temperature fluctuations at the tunnel entrance.The amplitude diminishes gradually with increasing distance from the tunnel inlet.Moreover,a more rapid decline in temperature fluctuation amplitude is observed as the wind speed within the tunnel decreases.The analytical outcomes for the tunnel's longitudinal temperature field are consistent with measurements taken under comparable conditions,validating the accuracy of the model.Additionally,in the radial direction of the tunnel,the amplitude of daily temperature fluctuation decreases as the distance from the lining surface increases.Similarly,both daily and weekly temperature fluctuations diminish at greater radial distances from the lining surface,while the median value slightly rises with increased radial depth.The frequency of freezing and thawing cycles at various radial depths within the tunnel's secondary lining follows a comparable pattern.
safety engineeringtemperature fieldfrost damageshort period fluctuation of temperature
万方数据
维普
