Study on the Characteristics of Environmental Temperature Distribution and Optimization of Ventilation Parameters in High-Temperature Tunnels During Construction Period
A field investigation was conducted on the temperature distribution of the high-temperature tunnel environment during the construction period,and a three-dimensional numerical model for single-head ventilation of the high-temperature tunnel during the construction period was established after quantifying the heat source based on the construction conditions.After verifying the reliability of the numerical model,a study was conducted on the distribution characteristics of tunnel temperature and optimization of ventilation parameters.The results show that:(1)The environmental temperature distribution along the tunnel can be divided into two sections.Within the first 20 meters from the heading face,there is a sudden increase followed by a decreasing trend,while from 20 meters beyond the heading face to the tunnel entrance,there is a trend of initial increase,followed by a decrease,and then a continuous increase with decreasing inlet air temperature or increasing airflow;(2)Decreasing inlet air temperature leads to a linear decrease in the peak environmental temperature within the tunnel,while increasing airflow results in a quadratic decrease in the peak environmental temperature,indicating that inlet air temperature has a more significant impact on the peak environmental temperature within the tunnel compared to airflow;(3)Utilizing a multivariate function,we established a predictive model for tunnel environmental temperature considering the coupling effects of airflow and inlet air temperature.The model suggests that when the inlet air temperature is ≤15 ℃,an airflow rate of＞40 m3/s is sufficient to meet the construction requirements for the tunnel environment.However,when the inlet air temperature exceeds 20 ℃,additional cooling measures are necessary.
high-ground temperature tunneltemperature reduction during constructiontemperature distribution along the tunneloptimization of ventilation parameters
万方数据
维普
