对流换热系数是计算围岩壁面与风流之间热交换量的重要参数。根据矿井风流与围岩热湿交换理论,提出测算井下巷道平均对流换热系数的方法。并在现场进行实测,通过对实测结果的回归分析,得出U型钢支护、断面形状为半圆拱以及工字钢支护、断面形状为梯形的巷道平均对流换热系数的简化计算式。并且当风速一定时,U型钢支护、断面形状为半圆拱的巷道平均对流换热系数值比工字钢支护、断面形状为梯形的要小;在这两种巷道条件下,其平均对流换热系数都随平均风速的增加而增大。 The convective heat transfer coefficient is an important parameter for calculating the amount of heat exchange between the wall of the surrounding rock and the wind flow. According to the theory of mine air flow and the heat and moisture exchange of surrounding rock, a method of measuring the average convective heat transfer coefficient in underground tunnel is put forward. And measured at the site. Based on the regression analysis of the measured results, the simplified formula for the average convective heat transfer coefficient of the roadway with U-shaped steel support, semicircular arch section and I-beam support, and trapezoidal section shape is obtained. And when the wind speed is constant, the mean convective heat transfer coefficient of the semi-circular archway supported by U-shaped steel is smaller than that of the I-shaped steel supported by the U-shaped steel. The average convection The heat transfer coefficient increases with the average wind speed.