压入式通风条件下巷道断面形状对独头巷道氡浓度影响研究

Study on the Influence of Section Shapes of Roadway on Radon Concentration in Blind Roadway under Forcing Type Ventilation

对某独头巷道排氡通风进行了数值模拟,模拟结果与实验数据吻合良好,探究了压入式通风条件下不同巷道断面形状对独头巷道氡浓度水平和分布规律的影响,结果表明:各断面形状巷道下浓度均满足压入式通风下浓度分布规律,但浓度向外扩散方式由于巷道断面形状不同而各异;氡容易在巷道断面形状中具有尖锐拐角的地方积聚;半圆拱形巷道通风排氡效果最好,不规则形效果最差,不规则形断面的巷道在工作面区域和整体区域的氡浓度要比半圆拱形高出30%-40%。

In this paper, the radon concentration and distribution of a blind roadway under exhaust ventilation mode is simulated by using FLUENT software. The simulation result is in good agreement with the experimental data. We studied the effects of different Section shapes of roadway on the radon concentration and distribution with forced ventilation. The results indicate that the concentration and distribution of radon in the tunnel with various section shapes conforms to the concentration and distribution law under forcing type ventilation, but the way of concentration diffusion is different; Radon is easy to accumulate in the Section shape of roadway with a sharp corner; The effect of radon removal in the shape of semicircular arch is the best, and the effect in the shape of irregular shape is the worst. In the working area and the whole area, the radon concentration in the tunnel with irregular cross-section is 30%-40% higher than the semicircle arch.