巷道围岩温度分布及调热圈半径的影响因素分析

Analysis of the Factors Influencing Temperature Distribution of Surrounding Rock and Cooled Zone Radius

分析了巷道壁面水分蒸发情况下通风时间、岩石的热物理性质、巷道几何尺寸、巷道风流与围岩壁面的对流换热系数、壁面湿度系数与风流相对湿度的变化对围岩温度分布及调热圈半径的影响。随着通风时间的延长 ,围岩冷却范围逐渐向围岩内部推移 ,推移速度逐渐降低 ;巷道壁面水分蒸发和风流相对湿度对靠近壁面处围岩温度分布影响很大 ,但对深部围岩温度分布的影响逐渐变小 ,所以对调热圈半径的影响很小 ;岩石导温系数对调热圈半径及其内部的温度分布影响较大。巷道壁面风流与围岩的换热系数和巷道的几何尺寸对巷道围岩的冷却范围影响非常小。

Temperature distribution of the surrounding rock and its variation with ventilation time, airway scale, temperature conductivity, heat convection coefficient, wetness factor and relative humidity of airflow are analyzed with taking consider of the water evaporation on the airway surface. Cooled zone expands with the increase of the ventilation time, but the expanding speed decreases with the ventilation time elapse. The water evaporation on airway surface and relative humidity of airflow have a great influence on the temperature distribution of the surrounding rock near the airway surface, but have a little effect to the temperature distribution of the surrounding rock in deeper area. Temperature conductivity of rock has a great influence on cooled zone radius and the temperature distribution in cooled zone. Heat convection coefficient and airway scale have little influence on the area of cooled zone by ventilation.