压入式通风独头巷道内氡及其子体浓度的计算模型与其分布规律

摘要

Through the theoretical calculation values of accumulated potentialα energy concentration of radon daughters decayed by radon with given initial concentration 0−14 400 s, a simplified mathematical relationship between potentialα energy concentration of radon daughters and radon concentration and cumulative decay time was identified. According to sources of radon and its daughters in blind roadway, mathematical calculation models of radon concentration and potentialα energy concentration of radon daughters in the ventilation air of blind roadway with forced ventilation were established respectively. The calculation models were applied to a specific blind roadway with forced ventilation, and the distribution rules of radon concentration and potentialα energy concentration of radon daughters in the roadway were discussed. The results show that radon concentration and potentialα energy concentration of radon daughters increase with the increase of the radon exhalation rate of roadway wall or the flowing distance of ventilation air, but they decrease with the increase of ventilation air flow; radon coming from ore heap can cause the sudden increase of radon concentration in the working face, and the potentialα energy concentration of radon daughters gradually increase with the increase of the flowing distance of ventilation air.%通过一定初始浓度的氡在0~14400 s内累积衰变产生的氡子体α潜能浓度的理论计算值，建立氡子体α潜能浓度与氡浓度和累积衰变时间之间的简化数学关系；依据独头巷道内氡及氡子体的来源，分别建立压入式通风方式下巷道内通风风流中氡浓度与氡子体α潜能浓度的数学计算模型；针对具体的独头巷道，研究不同通风量、岩壁氡析出率和有无矿堆情况下整个巷道内氡浓度和氡子体α潜能浓度分布规律。研究结果表明：压入通风方式的独头巷道内，氡浓度及氡子体α潜能浓度均随着岩壁氡析出率和风流流动距离的增大而增大，随着通风风量的增大而减小；工作面矿堆析出的氡能迅速导致风流中氡浓度的增大，而其产生的氡子体α潜能浓度随着风流流动距离增加逐渐增大；