渗流作用下深部高温巷道围岩温度场分布规律

Temperature field distribution of surrounding rock in deep high-temperature roadway under seepage

为探究渗流作用下深部高温巷道围岩温度场分布规律,以新城金矿为工程背景,运用Fluent软件模拟不同渗流因素下围岩温度场分布规律。结果显示:深部巷道围岩在渗流作用下温度场分布特征发生改变,等温线沿渗流方向分布;随着围岩孔隙率增大,温度场受扰动范围及调热圈半径不断增大,围岩径向温度和壁面温度随之降低;渗流水速度对围岩温度场分布特征影响较大,当渗流水速度≥2×10^(-8)m/s时,等温线沿渗流方向分布,渗流水速度<2×10^(-8)m/s时,等温线呈对称分布;随着渗流水速度增加,围岩温度场受扰动范围、调热圈半径、壁面温度升高,围岩径向温度随之降低;水流温度对围岩温度场分布特征、调热圈半径、温度场受扰动范围影响较小,围岩径向温度、壁面温度随水温升高而升高。

To investigate the temperature distribution of the surrounding rock in a deep high-temperature roadway under seepage,the temperature of the raw rock in the middle transportation roadway of 0108(V)was monitored by using the deep-hole temperature measurement method.Simulations and analyses were performed using Fluent CFD software to investigate the effects of varying surrounding rock porosity,seepage velocity,and water temperature on the temperature field of the surrounding rock in a deep roadway.The findings indicate that the original rock temperature is 35.6℃,belonging to the first level of heat damage area;The distribution characteristics of the temperature field of the enclosing rock under seepage are different from those of the enclosing rock without seepage,distribution of isotherms of the temperature field of the enclosing rock under seepage along the seepage direction;Surrounding rock porosities have no significant effect on the distribution characteristics of the surrounding rock temperature field under seepage,because as the surrounding rock porosity increases,the range of the disturbed zone of the surrounding rock temperature field and the radius of the heat tuning circle continuously increase,and the radial temperature of the surrounding rock and the temperature of the tunnel wall decrease;Seepage velocity has a great influence on the distribution characteristics of the surrounding rock temperature field,when the seepage velocity≥2×10^(-8)m/s,its isotherms are distributed along the seepage direction,and when the seepage velocity<2×10^(-8)m/s,the isotherms are said to be symmetrically distributed.As the seepage velocity increases,the area of the disturbed zone of the surrounding rock temperature field,the radius of the heat tuning circle,and the temperature of the tunnel wall increase,and the radial temperature of the surrounding rock decreases;Water flow temperatures have no significant effect on the distribution mode of the surrounding rock temperature field,the radius of the heat-regulating circle,and the area of the disturbed zone of the temperature field under the influence of seepage.The radial temperature and the wall temperature of the surrounding rock increase as the seepage water temperature increases.